1
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Palacios Rodríguez JC, Mendoza A, Sosa Rivadeneyra M, Bernès S. 2-[3-(1 H-Benzimidazol-2-yl)prop-yl]-1 H-benzimidazol-3-ium 3,4,5-tri-hydroxy-benzoate-1,3-bis-(1 H-benzimidazol-2-yl)propane-ethyl acetate (2/1/2.94): co-crystallization between a salt, a neutral mol-ecule and a solvent. Acta Crystallogr E Crystallogr Commun 2023; 79:562-566. [PMID: 37288461 PMCID: PMC10242745 DOI: 10.1107/s2056989023004279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Accepted: 05/16/2023] [Indexed: 06/09/2023]
Abstract
The chemical formula of the title compound, 2C17H17N4 +·2C7H5O5 -·C17H16N4·2.94C4H8O2, was established by X-ray diffraction of a single-crystal obtained by reacting 1,3-bis-(benzimidazol-2-yl)propane (L) and gallic acid (HGal) in ethyl acetate. The mol-ecular structure can be described as a salt (HL)+(Gal)- co-crystallized with a mol-ecule L, with a stoichiometric relation of 2:1. Moreover, large voids in the crystal are filled with ethyl acetate, the amount of which was estimated by using a solvent mask during structure refinement, affording the chemical formula (HL +·Gal-)2·L·(C4H8O2)2.94. The arrangement of components in the crystal is driven by O-H⋯O, N-H⋯O and O-H⋯N hydrogen bonds rather than by π-π or C-H⋯π inter-actions. In the crystal, mol-ecules and ions shape the boundary of cylindrical tunnels parallel to [100] via R (rings) and D (discrete) supra-molecular motifs. These voids, which account for about 28% of the unit-cell volume, contain disordered solvent mol-ecules.
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Affiliation(s)
| | - Angel Mendoza
- Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla, 72570 Puebla, Pue., Mexico
| | - Martha Sosa Rivadeneyra
- Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, 72570 Puebla, Pue., Mexico
| | - Sylvain Bernès
- Instituto de Física, Benemérita Universidad Autónoma de Puebla, 72570 Puebla, Pue., Mexico
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2
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Guerrero-Luna G, Hernández-Linares MG, Cárdenas García M, Bernès S. (23 R,23 1 S,25 S)-23 1,26-Ep-oxy-23-ethyl-furost-20(22)-en-3β-ol. IUCrdata 2023; 8:x230344. [PMID: 37151203 PMCID: PMC10162030 DOI: 10.1107/s2414314623003449] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Accepted: 04/16/2023] [Indexed: 05/09/2023] Open
Abstract
The title compound, C29H46O3, is a steroid synthesized through a rearrangement of a sarsasapogenin derivative in acidic medium. The newly formed ring F is a tetra-hydro-2H-pyran heterocycle substituted by two methyl groups placed in equatorial positions. This ring displays a chair conformation, while di-hydro-furan ring E, to which it is bonded, has an envelope conformation. The mol-ecules are associated by weak O-H⋯O hydrogen bonds to form chains running in the [101] direction in the crystal.
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Affiliation(s)
- Gabriel Guerrero-Luna
- Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla, Av. San Claudio y 18 Sur, 72570 Puebla, Pue., Mexico
| | - María-Guadalupe Hernández-Linares
- Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla, Av. San Claudio y 18 Sur, 72570 Puebla, Pue., Mexico
- Laboratorio de Investigación del Jardín Botánico, Benemérita Universidad Autónoma de Puebla, Av. San Claudio y 18 Sur, 72570 Puebla, Pue., Mexico
| | - Maura Cárdenas García
- Facultad de Medicina, Benemérita Universidad Autónoma de Puebla, 13 Sur 2702, 72420 Puebla, Pue., Mexico
| | - Sylvain Bernès
- Instituto de Física, Benemérita Universidad Autónoma de Puebla, Av. San Claudio y 18 Sur, 72570 Puebla, Pue., Mexico
- Correspondence e-mail:
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3
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Bernès S, Camargo S. Cyclohexane plastic phase I: single-crystal diffraction images and new structural model. IUCr Data 2023; 8:x230114. [PMID: 37180346 PMCID: PMC10171323 DOI: 10.1107/s2414314623001141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Accepted: 02/07/2023] [Indexed: 03/09/2023] Open
Abstract
The plastic phase of cyclohexane (polymorph I) was studied by Kahn and co-workers, without achieving a satisfactory determination of the atomic coordinates [Kahn et al. (1973). Acta Cryst. B29, 131–138]. The positions of the C atoms cannot be determined directly as a consequence of the disorder in a high-symmetry space group, an inherent feature of plastic materials. Given this situation, the building of a polyhedron describing the disorder was the main tool for determining the molecular structure in the present work. Based on the shape of reflections {111}, {200} and {113} in space group Fm
3
m, we assumed that cyclohexane is disordered through the action of rotation group 432. The polyhedral cluster of disordered molecules is then a rhombic dodecahedron centred on the nodes of an fcc Bravais lattice. The vertices of this polyhedron are the positions of C atoms for the cyclohexane molecule, which is disordered over 24 positions. With such a model, the asymmetric unit is reduced to two C atoms placed on special positions, and an acceptable fit between the observed and calculated structure factors is obtained.
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4
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Flores Manuel F, Sosa Rivadeneyra M, Bernès S. Meloxicam hydrochloride. IUCr Data 2023; 8:x230202. [PMID: 37180348 PMCID: PMC10171328 DOI: 10.1107/s241431462300202x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Accepted: 03/02/2023] [Indexed: 03/12/2023] Open
Abstract
The title salt, C14H14N3O4S2
+·Cl− [systematic name: 2-(4-hydroxy-2-methyl-1,1-dioxo-1,2-benzothiazine-3-amido)-5-methyl-1,3-thiazol-3-ium chloride] is the hydrochloride derivative of meloxicam, a drug used to treat pain and inflammation in rheumatic disorders and osteoarthritis. Although its molecular structure is similar to that previously reported for the hydrobromide analogue, both salts are not isomorphous. Different crystal structures originate from a conformational modification, arising from a degree of rotational freedom for the thiazolium ring in the cations. By taking as a reference the conformation of meloxicam, the thiazolium ring is twisted by 10.96 and −16.70° in the hydrochloride and hydrobromide salts, while the 1,2-benzothiazine core is a rigid scaffold. This behaviour could explain why meloxicam is a polymorphous compound.
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5
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López-Velázquez D, Núñez-Méndez I, Bernès S, Martínez-de la Luz I, Pérez-Cruz MA. 1,4-Phenyl-ene diallyl bis-(carbonate). IUCrdata 2023; 8:x230133. [PMID: 36911076 PMCID: PMC9993898 DOI: 10.1107/s2414314623001335] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Accepted: 02/13/2023] [Indexed: 02/25/2023] Open
Abstract
The title mol-ecule, C14H14O6, is based on a benzene core di-substituted by allyl carbonate groups in the para positions. The mol-ecule is placed on an inversion centre, and the substituents are twisted with respect to the central benzene ring plane. The crystal structure does not include significant inter-molecular inter-actions other than weak C-H⋯O contacts between CH groups in the benzene ring and carbonate O atoms.
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Affiliation(s)
- Delia López-Velázquez
- Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, 72570 Puebla, Pue., Mexico
| | - Irma Núñez-Méndez
- Doctorado en Ciencias Químicas, Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, 72570 Puebla, Pue., Mexico
| | - Sylvain Bernès
- Instituto de Física, Benemérita Universidad Autónoma de Puebla, Av. San Claudio y 18 Sur, 72570 Puebla, Pue., Mexico
| | - Isabel Martínez-de la Luz
- Doctorado en Ciencias Químicas, Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, 72570 Puebla, Pue., Mexico
| | - María Ana Pérez-Cruz
- Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, 72570 Puebla, Pue., Mexico
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Pouye SF, Bernès S, Yaffa L, Diallo W, Cissé I, Diop CAK, Sidibé M, Diop L. Synthesis and topology analysis of chlorido-triphen-yl(triphenyl phosphate-κ O)tin(IV). Acta Crystallogr E Crystallogr Commun 2023; 79:99-102. [PMID: 36793403 PMCID: PMC9912461 DOI: 10.1107/s2056989023000270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Accepted: 01/10/2023] [Indexed: 01/18/2023]
Abstract
The title SnIV complex, [Sn(C6H5)3Cl(C18H15O4P)], is a formal adduct between triphenyl phosphate (PhO)3P=O and the stannane derivative chlorido-tri-phenyl-tin, SnPh3Cl. The structure refinement reveals that this mol-ecule displays the largest Sn-O bond length for compounds including the X=O→SnPh3Cl fragment (X = P, S, C, or V), 2.6644 (17) Å. However, an AIM topology analysis based on the wavefunction calculated from the refined X-ray structure shows the presence of a bond critical point (3,-1), lying on the inter-basin surface separating the coordinated phosphate O atom and the Sn atom. This study thus shows that an actual polar covalent bond is formed between (PhO)3P=O and SnPh3Cl moieties.
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Affiliation(s)
- Serigne Fallou Pouye
- Département de Sciences Appliquées et Technologies Emergentes, Ecole Supérieure des Sciences et Techniques de l’Ingénieur, Université Amadou Mahtar Mbow, BP 45927 Dakar NAFA VDN, Dakar, Senegal,Correspondence e-mail: ,
| | - Sylvain Bernès
- Instituto de Física, Benemérita Universidad Autónoma de Puebla, Av. San Claudio y 18 Sur, 72570 Puebla, Pue., Mexico,Correspondence e-mail: ,
| | - Lamine Yaffa
- Laboratoire de Chimie Minérale et Analytique (LACHIMIA), Département de Chimie, Faculté des Sciences et Techniques, Université Cheikh Anta Diop, Dakar, Senegal
| | - Waly Diallo
- Laboratoire de Chimie Minérale et Analytique (LACHIMIA), Département de Chimie, Faculté des Sciences et Techniques, Université Cheikh Anta Diop, Dakar, Senegal
| | - Ibrahima Cissé
- Département de Sciences Appliquées et Technologies Emergentes, Ecole Supérieure des Sciences et Techniques de l’Ingénieur, Université Amadou Mahtar Mbow, BP 45927 Dakar NAFA VDN, Dakar, Senegal
| | - Cheikh Abdoul Khadir Diop
- Laboratoire de Chimie Minérale et Analytique (LACHIMIA), Département de Chimie, Faculté des Sciences et Techniques, Université Cheikh Anta Diop, Dakar, Senegal
| | - Mamadou Sidibé
- Laboratoire de Chimie Minérale et Analytique (LACHIMIA), Département de Chimie, Faculté des Sciences et Techniques, Université Cheikh Anta Diop, Dakar, Senegal
| | - Libasse Diop
- Laboratoire de Chimie Minérale et Analytique (LACHIMIA), Département de Chimie, Faculté des Sciences et Techniques, Université Cheikh Anta Diop, Dakar, Senegal
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Martínez-de la Luz I, López-Velázquez D, Bernès S, Varela Caselis JL. Bis(4-hydroxyphenyl) 1,4-phenylenebiscarbamate. IUCr Data 2022; 7:x220919. [DOI: 10.1107/s2414314622009191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Accepted: 09/15/2022] [Indexed: 11/10/2022] Open
Abstract
The title compound, C20H16N2O6 (systematic name: 4-hydroxyphenyl N-{4-[(4-hydroxyphenoxycarbonyl)amino]phenyl}carbamate), contains two urethane groups substituting the central benzene ring in para positions. The molecule is centrosymmetric, and displays a twisted conformation for the three aromatic rings [the dihedral angle between central benzene ring and the urethane group is 33.4 (6)°, and that between the latter and the terminal ring is 65.1 (1)°]. In the crystal, a three-dimensional framework is formed through O—H...O and N—H...O hydrogen bonds involving the hydroxy and urethane functional groups, respectively.
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8
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Setifi Z, Bernès S, Geiger DK, Setifi F, Reedijk J. Concomitant dimorphism in poly[di-μ-azido-(5,5′-dimethyl-2,2′-bipyridine)iron(II)]. Acta Crystallogr C Struct Chem 2022; 78:449-454. [DOI: 10.1107/s2053229622006908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Accepted: 07/06/2022] [Indexed: 11/10/2022]
Abstract
The title metal–organic polymer, catena-poly[[(5,5′-dimethyl-2,2′-bipyridine-κ2
N,N′)iron(II)]-di-μ-azido-κ2
N
1:N
3-[(5,5′-dimethyl-2,2′-bipyridine-κ2
N,N′)iron(II)]-di-μ-azido-κ2
N
1:N
1], [Fe(N3)2(C12H12N2)]
n
, features alternating μ-1,1 (end-on mode of coordination) and μ-1,3 (end-to-end mode of coordination) double azide bridges, forming chains running in the [100] direction. The octahedral coordination geometry around the FeII centre is completed by a bidentate 5,5′-dimethyl-2,2′-bipyridine ligand. Two polymorphs for this compound were obtained from the crude reaction product, the first in the space group P\overline{1} and the other in P21/c. The molecular and crystal structures are very similar for both forms, the main difference being that the eight-membered Fe(μ-1,3-N3)2Fe metallacycle formed with end-to-end azide ligands has a nearly flat conformation in the triclinic form and a chair conformation in the monoclinic form. In spite of this geometric difference, both forms have the same density, the same packing index and similar arrangements of the one-dimensional chains in the crystal. As a consequence, they also share very similar Hirshfeld surfaces and fingerprint plots. However, a density functional theory (DFT) computational study showed that the monoclinic form is more stable than the triclinic form by ca 30.5 kJ mol−1.
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Camargo S, Bernès S, Rivas-Silva J, Silva-González N, Salazar-Kuri U. Prediction, determination and stability of the mixed NaBr–KBr crystal structure. J SOLID STATE CHEM 2022. [DOI: 10.1016/j.jssc.2022.123124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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10
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Pérez-Benítez A, Ariza-Ramírez JL, Fortis-Valera M, Arroyo-Carmona RE, Martínez de la Luz MI, Ramírez-Contreras D, Bernès S. Bis{[amino(iminiumyl)methyl]urea} tetrakis{2-[(dimethylamino)(iminiumyl)methyl]guanidine} di-μ 6-oxido-tetra-μ 3-oxido-tetradeca-μ 2-oxido-octaoxidodecavanadium(V) tetrahydrate. IUCrData 2022; 7:x220627. [PMID: 36339897 PMCID: PMC9462036 DOI: 10.1107/s2414314622006277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Accepted: 06/14/2022] [Indexed: 11/23/2022] Open
Abstract
In the crystal structure of the title compound, numerous N—H⋯O and O—H⋯O hydrogen bonds of medium strengths connect metforminium and guanylurea cations and centrosymmetric decavanadate(V) anions into a three-dimensional network structure. The title compound, (C4H12N5)4(C2H7N4O)2[V10O28]·4H2O, is a by-product obtained by reacting ammonium metavanadate(V), metformin hydrochloride and acetic acid in the presence of sodium hypochlorite, at pH = 5. The crystal structure comprises a decavanadate(V) anion (V10O28)6– lying on an inversion centre in space group P, while cations and solvent water molecules are placed in general positions, surrounding the anion, and forming numerous N—H⋯O and O—H⋯O hydrogen bonds. Metforminium (C4H12N5)+ and guanylurea (C2H7N4O)+ cations display the expected shape. Interestingly, in physiology the latter cation is known to be the main metabolite of the former one. The reported structure thus supports the role of sodium hypochlorite as an oxidizing reagent being able to degrade metformin hydrochloride to form guanylurea.![]()
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Emmanuel López Muñoz P, Rodríguez Tzompantzi T, Bernès S, Luisa Meza-León R. Regio-, chemo- and stereoselective epoxidation of the 7,3-lactone-xylofuranose and some related chiral lactones. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2022.153811] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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12
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Reyes-Bravo E, Gnecco D, Juárez JR, Orea ML, Bernès S, Aparicio DM, Terán JL. Diastereoselective synthesis of new zwitterionic bicyclic lactams, scaffolds for construction of 2-substituted-4-hydroxy piperidine and its pipecolic acid derivatives. RSC Adv 2022; 12:4187-4190. [PMID: 35425406 PMCID: PMC8981097 DOI: 10.1039/d1ra09298g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Accepted: 01/21/2022] [Indexed: 11/21/2022] Open
Abstract
The synthesis of new chiral highly functionalized zwitterionic bicyclic lactams starting from acyclic β-enaminoesters derived from (R)-(-)-2-phenylglycinol is described. The key step involved an intramolecular non-classical Corey-Chaykovsky ring-closing reaction of the corresponding sulfonium salts derived from β-enaminoesters. This methodology permits the generation of two or three new stereogenic centers with high diastereoselectivity. The utility of these intermediates was demonstrated by the stereocontrolled total synthesis of cis-4-hydroxy-2-methyl piperidine and its corresponding pipecolic acid derivative.
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Affiliation(s)
- Enrique Reyes-Bravo
- Centro de QuííInstituto de Cienciasmica, Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla Edif. IC-9 Complejo de Ciencias C.U. 72570 Puebla Mexico
| | - Dino Gnecco
- Centro de QuííInstituto de Cienciasmica, Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla Edif. IC-9 Complejo de Ciencias C.U. 72570 Puebla Mexico
| | - Jorge R Juárez
- Centro de QuííInstituto de Cienciasmica, Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla Edif. IC-9 Complejo de Ciencias C.U. 72570 Puebla Mexico
| | - María L Orea
- Centro de QuííInstituto de Cienciasmica, Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla Edif. IC-9 Complejo de Ciencias C.U. 72570 Puebla Mexico
| | - Sylvain Bernès
- Instituto de Física, Benemérita Universidad Autónoma de Puebla 1IF2(aka 110-B), Lab. 102, C.U. 72570 Puebla Mexico
| | - David M Aparicio
- Centro de QuííInstituto de Cienciasmica, Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla Edif. IC-9 Complejo de Ciencias C.U. 72570 Puebla Mexico
| | - Joel L Terán
- Centro de QuííInstituto de Cienciasmica, Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla Edif. IC-9 Complejo de Ciencias C.U. 72570 Puebla Mexico
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13
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Bernès S, Hernández-Linares MG. N, N′-Dicyclohexyl- N-(phthaloylglycyl)urea. IUCr Data 2021; 6:x210697. [PMID: 36340662 PMCID: PMC9462355 DOI: 10.1107/s2414314621006970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Accepted: 07/06/2021] [Indexed: 11/10/2022] Open
Abstract
The title urea derivative forms a one-dimensional supramolecular structure in the solid state, via intermolecular N—H⋯O hydrogen bonds. The molecular structure of the title compound {systematic name: 1,3-dicyclohexyl-1-[2-(1,3-dioxo-2,3-dihydro-1H-isoindol-2-yl)acetyl]urea}, C23H29N3O4, derived from N,N′-dicyclohexylurea, shows that the tertiary N atom substituted by a cyclohexyl and phthaloylglycyl groups adopts a perfectly planar geometry (bond-angle sum = 360.0°). In the same way as for N,N′-dicyclohexylurea, the extended structure of the title compound features N—H⋯O hydrogen bonds, which generate chains of molecules running in the [001] direction.![]()
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14
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Hilario-Martínez JC, Huerta A, Amaro-López JC, Alatriste V, De Los Santos MG, Martínez I, Bernès S, Sandoval-Ramírez J, Merino G, Luna F, Fernández-Herrera MA. Stereoselective synthesis of (26R)-26-hydroxydiosgenin and its effect on the regulation of rat ovarian function. Bioorg Chem 2021; 115:105189. [PMID: 34325218 DOI: 10.1016/j.bioorg.2021.105189] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 07/14/2021] [Accepted: 07/15/2021] [Indexed: 10/20/2022]
Abstract
The stereoselective cyclization of a C-16 acetylated 22,26-dioxocholestene derivative to give the spirostane E and F rings, under alkaline conditions, yields exclusively the (26R)-26-hydroxydiosgenin. Both experimental and computational data support the formation of a single diastereoisomer. The effect of diosgenin and (26R)-26-hydroxydiosgenin on rat ovary is also investigated.
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Affiliation(s)
- J Ciciolil Hilario-Martínez
- Departamento de Física Aplicada, Centro de Investigación y de Estudios Avanzados, Unidad Mérida, Km 6 Antigua Carretera a Progreso. Apdo. Postal 73, Cordemex, 97310 Mérida, Yuc., Mexico; Facultad de Ciencias Químicas, Laboratorio de Síntesis y Modificación de Productos Naturales, Benemérita Universidad Autónoma de Puebla, Ciudad Universitaria, 72570 Puebla, Pue., Mexico
| | - Aurora Huerta
- Facultad de Ciencias Químicas, Laboratorio de Neuroendocrinología, Benemérita Universidad Autónoma de Puebla, Ciudad Universitaria, 72570 Puebla, Pue., Mexico
| | - Julio C Amaro-López
- Facultad de Ciencias Químicas, Laboratorio de Neuroendocrinología, Benemérita Universidad Autónoma de Puebla, Ciudad Universitaria, 72570 Puebla, Pue., Mexico
| | - Victorino Alatriste
- Facultad de Ciencias Químicas, Laboratorio de Neuroendocrinología, Benemérita Universidad Autónoma de Puebla, Ciudad Universitaria, 72570 Puebla, Pue., Mexico
| | - María G De Los Santos
- Departamento de Física Aplicada, Centro de Investigación y de Estudios Avanzados, Unidad Mérida, Km 6 Antigua Carretera a Progreso. Apdo. Postal 73, Cordemex, 97310 Mérida, Yuc., Mexico
| | - Isabel Martínez
- Facultad de Ciencias Químicas, Laboratorio de Neuroendocrinología, Benemérita Universidad Autónoma de Puebla, Ciudad Universitaria, 72570 Puebla, Pue., Mexico
| | - Sylvain Bernès
- Instituto de Física, Benemérita Universidad Autónoma de Puebla, Ciudad Universitaria, 72570 Puebla, Pue., Mexico
| | - Jesús Sandoval-Ramírez
- Facultad de Ciencias Químicas, Laboratorio de Síntesis y Modificación de Productos Naturales, Benemérita Universidad Autónoma de Puebla, Ciudad Universitaria, 72570 Puebla, Pue., Mexico
| | - Gabriel Merino
- Departamento de Física Aplicada, Centro de Investigación y de Estudios Avanzados, Unidad Mérida, Km 6 Antigua Carretera a Progreso. Apdo. Postal 73, Cordemex, 97310 Mérida, Yuc., Mexico
| | - Félix Luna
- Facultad de Ciencias Químicas, Laboratorio de Neuroendocrinología, Benemérita Universidad Autónoma de Puebla, Ciudad Universitaria, 72570 Puebla, Pue., Mexico.
| | - María A Fernández-Herrera
- Departamento de Física Aplicada, Centro de Investigación y de Estudios Avanzados, Unidad Mérida, Km 6 Antigua Carretera a Progreso. Apdo. Postal 73, Cordemex, 97310 Mérida, Yuc., Mexico.
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15
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Chocolatl Torres M, Bernès S, Salazar Kuri U. Refinement of K[HgI 3]·H 2O using non-spherical atomic form factors. Acta Crystallogr E Crystallogr Commun 2021; 77:681-685. [PMID: 34513010 PMCID: PMC8382053 DOI: 10.1107/s2056989021005582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Accepted: 05/31/2021] [Indexed: 11/18/2022]
Abstract
The crystal structure model for potassium tri-iodido-mercurate(II) monohydrate, K[HgI3]·H2O, based on single-crystal data, was reported 50 years ago [Nyqvist & Johansson (1971 ▸). Acta Chem. Scand. 25, 1615-1629]. We have now redetermined this structure with X-ray diffraction data at 0.70 Å resolution collected at 153 K using Ag Kα radiation. Combined quantum mechanical methods (ORCA) and computation of non-spherical scattering form factors (NoSpherA2) allowed the refinement of the shape of the water mol-ecule with anisotropic H atoms, despite the presence of heavy elements in the crystal. The refined shape of the water mol-ecule via this Hirshfeld refinement is close to that determined for liquid water by neutron diffraction experiments. Moreover, the Laplacian of the electron density clearly shows how electron density accumulates along the O-H σ-valence bonds in the water mol-ecule.
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Affiliation(s)
| | - Sylvain Bernès
- Instituto de Física, Benemérita Universidad Autónoma de Puebla, 72570 Puebla, Pue., Mexico
| | - Ulises Salazar Kuri
- Instituto de Física, Benemérita Universidad Autónoma de Puebla, 72570 Puebla, Pue., Mexico
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16
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Polito-Lucas JA, Núñez-Ávila JA, Bernès S, Pérez-Benítez A. Tetraammonium bis(metforminium) di-μ 6-oxido-tetra-μ 3-oxido-tetradeca-μ 2-oxido-octaoxidodecavanadium(V) hexahydrate. IUCrData 2021; 6:x210634. [DOI: 10.1107/s2414314621006349] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Accepted: 06/18/2021] [Indexed: 11/10/2022] Open
Abstract
The title compound, (NH4)4(C4H12N5)2[V10O28]·6H2O, crystallizes with the decavanadate anion placed on an inversion centre in space group P\overline{1}. This anion is surrounded by a first shell of ammonium cations and water molecules, forming efficient N—H...O and O—H...O hydrogen bonds. A second shell includes metforminium monocations with a twisted geometry, also forming numerous intermolecular hydrogen bonds. The complex three-dimensional network of non-covalent interactions affords a crystal structure in which the cations and anions are densely packed.
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17
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Pastor Ramírez C, Bernès S, Hernández Anzaldo S, Reyes Ortega Y. Structure and NMR properties of the dinuclear complex di-μ-azido-κ 4 N 1: N 1-bis-[(azido-κ N)(pyridine-2-carboxamide-κ 2 N 1, O)zinc(II)]. Acta Crystallogr E Crystallogr Commun 2021; 77:111-116. [PMID: 33614136 PMCID: PMC7869550 DOI: 10.1107/s2056989020016680] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Accepted: 12/23/2020] [Indexed: 11/10/2022]
Abstract
The new diamagnetic complex, [Zn2(N3)4(C6H6N2O)2] or [Zn2(pca)2(μ1,1-N3)2(N3)2] was synthesized using pyridine-2-carboxamide (pca) and azido ligands, and characterized using various techniques: IR spectroscopy and single-crystal X-ray diffraction in the solid state, and nuclear magnetic resonance (NMR) in solution. The mol-ecule is placed on an inversion centre in space group P . The pca ligand chelates the metal centre via the pyridine N atom and the carbonyl O atom. One azido ligand bridges the two symmetry-related Zn2+ cations in the end-on coordination mode, while the other independent azido anion occupies the fifth coordination site, as a terminal ligand. The resulting five-coordinate Zn centres have a coordination geometry inter-mediate between trigonal bipyramidal and square pyramidal. The behaviour of the title complex in DMSO solution suggests that it is a suitable NMR probe for similar or isostructural complexes including other transition-metal ions. The diamagnetic nature of the complex is reflected in similar 1H and 13C NMR chemical shifts for the free ligand pca as for the Zn complex.
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Affiliation(s)
- Cándida Pastor Ramírez
- Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla, Av. San Claudio y 18 Sur, 72570 Puebla, Pue., Mexico
| | - Sylvain Bernès
- Instituto de Física, Benemérita Universidad Autónoma de Puebla, 72570 Puebla, Pue., Mexico
| | - Samuel Hernández Anzaldo
- Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla, Av. San Claudio y 18 Sur, 72570 Puebla, Pue., Mexico
| | - Yasmi Reyes Ortega
- Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla, Av. San Claudio y 18 Sur, 72570 Puebla, Pue., Mexico
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18
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Martínez-Gallegos AA, Guerrero-Luna G, Ortiz-González A, Cárdenas-García M, Bernès S, Hernández-Linares MG. Azasteroids from diosgenin: Synthesis and evaluation of their antiproliferative activity. Steroids 2021; 166:108777. [PMID: 33309534 DOI: 10.1016/j.steroids.2020.108777] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Revised: 11/17/2020] [Accepted: 12/01/2020] [Indexed: 12/12/2022]
Abstract
In this work, we report the synthesis of two new azasteroids through the modification of the A and B rings of diosgenin 1. The 4-azasteroid derivative 12 was prepared in three steps using the α,β-insaturated-3-keto compound 11 as a precursor, which was first oxidized with KMnO4/KIO4 followed by an oxidative cleavage of ring A, and subsequently cyclized with an ammonium salt, under focused microwave irradiation for a short time of 3 min. A second azasteroid was synthesized, for which the key step was the Beckmann rearrangement of ring B of the oxime 16, affording the lactam-type enamide 17 in good yield. The methodologies developed for the synthesis of the precursors derivatives 10 and 11 contribute to improved yields, compared to those reported in the literature. The biological activity of the azasteroidal compounds 12 and 17 and their precursors has been evaluated in cervical cancer cells (HeLa), colon (HCT-15), and triple negative breast cancer (MDA-MB-231) lines.
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Affiliation(s)
| | - Gabriel Guerrero-Luna
- Posgrado en Ciencias Químicas. Benemérita, Universidad Autónoma de Puebla, 72570 Puebla, Pue, Mexico
| | - Alejandra Ortiz-González
- Laboratorio de Fisiología Celular, Facultad de Medicina, Benemérita Universidad Autónoma de Puebla, 72570 Puebla, Pue, Mexico
| | - Maura Cárdenas-García
- Laboratorio de Fisiología Celular, Facultad de Medicina, Benemérita Universidad Autónoma de Puebla, 72570 Puebla, Pue, Mexico
| | - Sylvain Bernès
- Instituto de Física, Benemérita Universidad Autónoma de Puebla, 72570 Puebla, Pue, Mexico
| | - María Guadalupe Hernández-Linares
- Centro de Química, Instituto de Ciencias. Benemérita, Universidad Autónoma de Puebla, 72570 Puebla, Pue, Mexico; Laboratorio de Investigación Herbario y Jardín Botánico Universitario, Benemérita Universidad Autónoma de Puebla, 72570 Puebla, Pue, Mexico.
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19
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Arroyo-Carmona RE, García de la Rosa LA, Vázquez-Cabrera DM, Morales F, Escudero R, Bernès S, Pérez-Benítez A, Méndez-Rojas MA. Electrocrystallization, structural and physicochemical characterization of a novel copper(II) dinuclear paddle-wheel complex with sulindac, [Cu2(Suln)4]∙3H2O. Inorganica Chim Acta 2021. [DOI: 10.1016/j.ica.2020.120070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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20
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Angel Nieto I, Bernès S, Pérez-Benítez A. Crystal structure of a new hydrate form of the NSAID sodium diclofenac. Acta Crystallogr E Crystallogr Commun 2020; 76:1846-1850. [PMID: 33520266 PMCID: PMC7784647 DOI: 10.1107/s2056989020015108] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Accepted: 11/12/2020] [Indexed: 11/22/2022]
Abstract
The crystal structure is reported of sodium 2-[2-(2,6-di-chloro-anilino)phen-yl]acetate 3.5-hydrate or tetra-μ-aqua-κ8 O:O-deca-aqua-bis-{μ3-2-[2-(2,6-di-chloro-anilino)phen-yl]acetato-κ3 O:O:O}tetra-sodium(I) bis-{2-[2-(2,6-di-chloro-anil-ino)phen-yl]acetate}, {[Na4(C14H10Cl2NO2)2(H2O)14](C14H10Cl2NO2)2} n , which re-presents a new hydrate form of the NSAID sodium diclofenac (SD). The triclinic unit cell contains one ionic compound with formula Na4(C14H10Cl2NO2)4(H2O)14, in which two symmetry-related carboxyl-ate anions C14H10Cl2NO2 - are bonded to a centrosymmetric [Na4]4+ core cationic cluster, while the others are only hydrogen bonded to the cationic cluster. The conformation for the anions is similar to that found in other diclofenac compounds, and the [Na4(Ocarbox)2(H2O)14]4+ cluster displays an unprecedented geometry, which can be described as an incomplete dicubane cluster formed by face-sharing incomplete cubes. A complex framework of O-H⋯O hydrogen bonds stabilizes the crystal structure. The herein reported crystal structure for SD·3.5H2O in space group P is different from those previously reported for other hydrates, namely SD·4.75H2O (P21) and SD·5H2O (P21/m).
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Affiliation(s)
- Ismael Angel Nieto
- Instituto de Física, Benemérita Universidad Autónoma de Puebla, 72570 Puebla, Pue., Mexico
| | - Sylvain Bernès
- Instituto de Física, Benemérita Universidad Autónoma de Puebla, 72570 Puebla, Pue., Mexico
| | - Aarón Pérez-Benítez
- Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, 72570 Puebla, Pue., Mexico
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21
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Guerrero-Luna G, Reyes Melchor J, Bernès S, Hernández-Linares MG. Diosgenin-3,6-dione: second polymorph in space group P2 12 12 1. IUCr Data 2020; 5:x201200. [PMID: 36338905 PMCID: PMC9462274 DOI: 10.1107/s2414314620012006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Accepted: 08/31/2020] [Indexed: 12/05/2022] Open
Abstract
A polymorphic modification of the title steroidal compound, derived from diosgenin, results from a conformational alteration for the A/B ring system. The title steroid, [(25R)-spirost-4-en-3,6-dione, C27H38O4], is obtained by oxidation of diosgenin, using the Jones reagent (CrO3/H2SO4). The crystal structure was previously reported in space group P212121, but nonetheless with the wrong absolute configuration and omitting positions for H atoms [Rajnikant et al. (2000 ▸). Mol. Cryst. Liq. Cryst. Sci. Technol. Sect. C, 12, 101–110]. The diffraction data set reported herein is for a second polymorph in the same space group, as evidenced by simulated powder patterns. Both forms are characterized by a similar orthorhombic unit cell, and a similar arrangement of the molecules in the crystal structure. However, the conformation of the A/B rings in the steroid nucleus is slightly modified, leading to the observed polymorphism.![]()
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22
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Affiliation(s)
- Álvaro Dávila García
- Centro de Investigación de la Facultad de Ciencias Químicas Benemérita Universidad Autónoma de Puebla (BUAP) Puebla Mexico
| | - Sylvain Bernès
- Instituto de Física Benemérita Universidad Autónoma de Puebla (BUAP) Puebla Mexico
| | - Fernando Sartillo‐Piscil
- Centro de Investigación de la Facultad de Ciencias Químicas Benemérita Universidad Autónoma de Puebla (BUAP) Puebla Mexico
| | - Rosa Luisa Meza‐León
- Centro de Investigación de la Facultad de Ciencias Químicas Benemérita Universidad Autónoma de Puebla (BUAP) Puebla Mexico
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23
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Hilario-Martínez JC, Murillo F, García-Méndez J, Dzib E, Sandoval-Ramírez J, Muñoz-Hernández MÁ, Bernès S, Kürti L, Duarte F, Merino G, Fernández-Herrera MA. trans-Hydroboration-oxidation products in Δ 5-steroids via a hydroboration- retro-hydroboration mechanism. Chem Sci 2020; 11:12764-12768. [PMID: 34094471 PMCID: PMC8162471 DOI: 10.1039/d0sc01701a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Herein, we report for the first time a “trans-hydroboration–oxidation product” isolated and characterized under traditional hydroboration–oxidation conditions using cholesterol and diosgenin as substrates. These substrates are excellent starting materials because of the rigidity and different structural environments around the double bond. Further investigations based on experimental evidence, in conjunction with theoretical studies, indicate that the formation of this trans-species occurs via a retro-hydroboration of the major product to generate the corresponding Δ6-structure and the subsequent hydroboration by the β-face. Besides, the corresponding Markovnikov type products have been isolated in synthetically useful yields. The behavior of the reaction under a range of temperatures is also investigated. A trans-product is isolated and characterized under traditional hydroboration–oxidation conditions using Δ5-steroids as substrates. Experimental and theoretical studies indicate that the trans-species occurs via a retro-hydroboration mechanism.![]()
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Affiliation(s)
- J Ciciolil Hilario-Martínez
- Departamento de Física Aplicada, Centro de Investigación y de Estudios Avanzados Unidad Mérida. km 6 Antigua Carretera a Progreso. Apdo. Postal 73, Cordemex 97310 Merida Yuc. Mexico .,Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla Ciudad Universitaria 72570 Puebla Pue. Mexico
| | - Fernando Murillo
- Departamento de Física Aplicada, Centro de Investigación y de Estudios Avanzados Unidad Mérida. km 6 Antigua Carretera a Progreso. Apdo. Postal 73, Cordemex 97310 Merida Yuc. Mexico
| | - Jair García-Méndez
- Departamento de Física Aplicada, Centro de Investigación y de Estudios Avanzados Unidad Mérida. km 6 Antigua Carretera a Progreso. Apdo. Postal 73, Cordemex 97310 Merida Yuc. Mexico
| | - Eugenia Dzib
- Departamento de Física Aplicada, Centro de Investigación y de Estudios Avanzados Unidad Mérida. km 6 Antigua Carretera a Progreso. Apdo. Postal 73, Cordemex 97310 Merida Yuc. Mexico
| | - Jesús Sandoval-Ramírez
- Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla Ciudad Universitaria 72570 Puebla Pue. Mexico
| | - Miguel Ángel Muñoz-Hernández
- Centro de Investigaciones Químicas, Universidad Autónoma del Estado de Morelos Av. Universidad 1001 Cuernavaca Mor. C. P. 62209 Mexico
| | - Sylvain Bernès
- Instituto de Física, Benemérita Universidad Autónoma de Puebla Ciudad Universitaria 72570 Puebla Pue. Mexico
| | - László Kürti
- Department of Chemistry, Rice University BioScience Research Collaborative, 6500 Main Street Houston Texas 77030 USA
| | - Fernanda Duarte
- Chemistry Research Laboratory, Oxford University Mansfield Road OX1 3TA Oxford UK
| | - Gabriel Merino
- Departamento de Física Aplicada, Centro de Investigación y de Estudios Avanzados Unidad Mérida. km 6 Antigua Carretera a Progreso. Apdo. Postal 73, Cordemex 97310 Merida Yuc. Mexico
| | - María A Fernández-Herrera
- Departamento de Física Aplicada, Centro de Investigación y de Estudios Avanzados Unidad Mérida. km 6 Antigua Carretera a Progreso. Apdo. Postal 73, Cordemex 97310 Merida Yuc. Mexico
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24
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Romero-Ibañez J, Cruz-Gregorio E, Cruz-Gregorio S, Quintero L, Bernès S, González-Perea M, Sartillo-Piscil F. Electrochemical deamination of alkoxyamine lactams. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2020.152279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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25
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Flores Manuel F, Sosa Rivadeneyra M, Bernès S. One mol-ecule, three crystal structures: conformational trimorphism of N-[(1 S)-1-phenyl-eth-yl]benzamide. Acta Crystallogr E Crystallogr Commun 2020; 76:1229-1233. [PMID: 32844004 PMCID: PMC7405568 DOI: 10.1107/s2056989020008877] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Accepted: 06/30/2020] [Indexed: 11/10/2022]
Abstract
The title compound, C15H15NO, is an enanti-opure small mol-ecule, which has been synthesized many times, although its crystal structure was never determined. By recrystallization from a variety of solvent mixtures (pure aceto-nitrile, ethanol-water, toluene-ethanol, THF-methanol), we obtained three unsolvated polymorphs, in space groups P21 and P212121. Form I is obtained from aceto-nitrile, without admixture of other forms, whereas forms II and III are obtained simultaneously by concomitant crystallizations from alcohol-based solvent mixtures. All forms share the same supra-molecular structure, based on infinite C 1 1(4) chain motifs formed by N-H⋯O inter-molecular hydrogen bonds, as usual for non-sterically hindered amides. However, a conformational modification of the mol-ecular structure, related to the rotation of the phenyl rings, alters the packing of the chains in the crystal structures. The orientation of the chain axis is perpendicular and parallel to the crystallographic twofold screw axis of space group P21 in forms I and II, respectively. As for form III, the asymmetric unit contains two independent mol-ecules forming parallel chains in space group P212121, and the crystal structure combines features of monoclinic forms I and II.
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Affiliation(s)
- Fermin Flores Manuel
- Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, 72570 Puebla, Pue., Mexico
| | - Martha Sosa Rivadeneyra
- Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, 72570 Puebla, Pue., Mexico
| | - Sylvain Bernès
- Instituto de Física, Benemérita Universidad Autónoma de Puebla, 72570 Puebla, Pue., Mexico
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26
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Amaro Hernández AG, Rodríguez Tzompantzi T, Dávila García Á, Meza-León RL, Bernès S. Ethyl (3 S)-3-[(3a R,5 R,6 S,6a R)-6-hydroxy-2,2-dimethyltetrahydrofuro[4,5- d][1,3]dioxol-5-yl]-3-{(3 S)-3-[(3a R,5 R,6 S,6a R)-6-hydroxy-2,2-dimethyltetrahydrofuro[4,5- d][1,3]dioxol-5-yl]-5-oxoisoxazolidin-2-yl}propanoate chloroform monosolvate. IUCr Data 2020; 5:x200788. [PMID: 36340615 PMCID: PMC9462232 DOI: 10.1107/s2414314620007889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2020] [Accepted: 06/10/2020] [Indexed: 12/04/2022] Open
Abstract
The Flack and Watkin 2AD plot based on 1941 acentric Friedel pairs for the title chloroform solvate shows that the observed intensity differences for Friedel opposites are dominated by random and systematic errors, erasing information about resonant scattering. The title compound, C22H33NO12·CHCl3, was obtained as a product of a double aza-Michael addition of hydroxylamine on a Chiron with a known absolute configuration. The enantiopure compound crystallized as a chloroform solvate, in space group P1, and diffraction data were collected at room temperature with Ag Kα radiation. The Flack parameter refined to x = −0.01 (16); however, the Flack and Watkin 2AD plot clearly shows that differences between Friedel opposites (the D component of the plot) do not carry any reliable information about resonant scattering of Cl atoms, and are rather dominated by random and systematic errors. The RD factor calculated using 1941 acentric Friedel pairs is RD = 0.995. On the other hand, the 2A component of the plot, related to average intensities of Friedel pairs, shows that data are of good quality (RA = 0.069). This example illustrates that while using Ag Kα radiation (λ = 0.56083 Å), scatterers heavier than Cl should be present in a chiral crystal in order to determine confidently the absolute structure of the crystal.![]()
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Abstract
The crystal structure of (NH4)2V3O8 has been redetermined using data collected at 0.61 Å resolution, showing that the ammonium cation is disordered by rotation around a non-crystallographic axis. The crystal structure of (NH4)2V3O8 has been reported twice using single-crystal X-ray data [Theobald et al. (1984 ▸). J. Phys. Chem. Solids, 45, 581–587; Range et al. (1988 ▸). Z. Naturforsch. Teil B, 43, 309–317]. In both cases, the orientation of the ammonium cation in the asymmetric unit was poorly defined: in Theobald’s study, the shape and dimensions were constrained for NH4+, while in Range’s study, H atoms were not included. In the present study, we collected a highly redundant data set for this ternary oxide, at 0.61 Å resolution, using Ag Kα radiation. These accurate data reveal that the NH4+ cation is disordered by rotation around a non-crystallographic axis. The rotation axis coincides with one N—H bond lying in the mirror m symmetry element of space-group type P4bm, and the remaining H sites were modelled over two disordered positions, with equal occupancy. It therefore follows that the NH4+ cations filling the space available in the (001) layered structure formed by (V3O8)2– ions do not form strong N—H⋯O hydrogen bonds with the mixed-valent oxidovanadate(IV,V) anions. This feature could have consequences for the Li-ion intercalation properties of this material, which is used as a cathode for supercapacitors.![]()
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Guerrero-Luna G, Hernández-Linares MG, Bernès S, Carrasco-Carballo A, Montalvo-Guerrero D, Fernández-Herrera MA, Sandoval-Ramírez J. Mesoscale Assembly of Bisteroidal Esters from Terephthalic Acid. Molecules 2020; 25:molecules25051213. [PMID: 32182644 PMCID: PMC7179421 DOI: 10.3390/molecules25051213] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Revised: 02/24/2020] [Accepted: 03/01/2020] [Indexed: 11/16/2022] Open
Abstract
A new series of bisteroidal esters was synthesized using a spacer group, sterols and sapogenins as substrates. Steroidal dimers were prepared in high yields employing diesters of terephthalic acid as linkages at the 3β, 3'β steroidal positions. In all attempts to crystallize bisteroids, it was observed that the compounds tended to self-organize in solution, which was detected when employing various solvent systems. The non-covalent interactions (van der Waals) of the steroidal moieties of this series of symmetrical bisteroids, the polarity of the solvents systems, and the different solubilities of the bisteroid aggregates, indeed induce the molecules to self-assemble into supramolecular structures with well-defined organization. Our results show that the self-assembled structures for the bisteroidal derivatives depend on the solvent system used: with hexane/EtOAc, membrane-shaped structures were obtained, while pure EtOAc afforded strand-shaped arrangements. In the CHCl3/CH3OH system, thin strands were formed, since van der Waals interactions are lowered in this system, as a consequence of the increased solubility of the bisteroids in CHCl3. Based on the characterization by SEM and XRD, we show evidence that the phenomenon of self-assembly of bisteroids occurs presenting different morphologies depending on the solvent used. The new steroidal dimer derivatives were characterized by NMR, TGA, DSC, SEM, and XRD. Finally, the molecular structure of one bisteroid was confirmed by single-crystal X-ray analysis.
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Affiliation(s)
- Gabriel Guerrero-Luna
- Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, 72570 Puebla, Pue., Mexico; (G.G.-L.); (A.C.-C.); (J.S.-R.)
| | - María Guadalupe Hernández-Linares
- Centro de Química, Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla, 72570 Puebla, Pue., Mexico
- Laboratorio de Investigación, Herbario y Jardín Botánico Universitario, Benemérita Universidad Autónoma de Puebla, 72570 Puebla, Pue., Mexico
- Correspondence:
| | - Sylvain Bernès
- Instituto de Física, Benemérita Universidad Autónoma de Puebla, 72570 Puebla, Pue., Mexico;
| | - Alan Carrasco-Carballo
- Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, 72570 Puebla, Pue., Mexico; (G.G.-L.); (A.C.-C.); (J.S.-R.)
| | - Diana Montalvo-Guerrero
- Departamento de Física Aplicada, Centro de Investigación y de Estudios Avanzados–Unidad Mérida, km 6 Antigua Carretera a Progreso, Cordemex, 97310 Mérida, Yuc., Mexico; (D.M.-G.); (M.A.F.-H.)
| | - María A. Fernández-Herrera
- Departamento de Física Aplicada, Centro de Investigación y de Estudios Avanzados–Unidad Mérida, km 6 Antigua Carretera a Progreso, Cordemex, 97310 Mérida, Yuc., Mexico; (D.M.-G.); (M.A.F.-H.)
| | - Jesús Sandoval-Ramírez
- Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, 72570 Puebla, Pue., Mexico; (G.G.-L.); (A.C.-C.); (J.S.-R.)
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Anzaldo-Olivares B, Arroyo M, Ramírez-Monroy A, Bernès S. Tris(1H-benzimidazol-2-ylmethyl)amine methanol trisolvate. IUCrData 2020; 5:x200281. [DOI: 10.1107/s2414314620002813] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Accepted: 02/28/2020] [Indexed: 11/11/2022] Open
Abstract
The structure of the tertiary amine tris(1H-benzimidazol-2-ylmethyl)amine (C24H21N7, abbreviated ntb) has been previously reported twice as solvates, namely the monohydrate and the acetonitrile–methanol–water (1/0.5/1.5) solvate, both with the tripodal conformation formed via multiple hydrogen bonds. Now, we report the trimethanol adduct, ntb·3CH3OH, where the amine has the stair conformation featuring one benzimidazole group oriented in the opposite direction from the other two. The asymmetric unit contains one-half amine, completed through the mirror plane m in space group Pmn21 to form the ntb molecule, with the H atom for each imidazole moiety equally disordered between both N sites available in the imidazole ring. The asymmetric unit also contains one and a half methanol molecules, one being placed in general position with the hydroxy H atom disordered over two sites with occupancy ratio 1:1, while the other lies on the m mirror plane, and has thus its hydroxy H atom disordered by symmetry. As in the previously reported solvates, all imine and amine groups of the ntb molecules and the methanol molecules are involved in N—H...O and O—H...N hydrogen bonds. In the title compound, however, the involved H atom is systematically a disordered H atom provided by an imidazole group or a methanol molecule.
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López-González R, Gnecco D, Juárez JR, Orea ML, Gómez-Calvario V, Bernès S, Aparicio DM, Terán JL. Synthesis of (+)- and (−)-Geissman-Waiss lactone from chiral sulfonium salts. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2020.151697] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Arauzo A, Gasque L, Fuertes S, Tenorio C, Bernès S, Bartolomé E. Coumarin-lanthanide based compounds with SMM behavior and high quantum yield luminescence. Dalton Trans 2020; 49:13671-13684. [PMID: 32996514 DOI: 10.1039/d0dt02614j] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Coumarin-based lanthanide complexes of general formula [Ln(coum)3(phen)(H2O)x]·yH2O (Ln-phen, x = 0,1, 0 ≤ y ≤ 1.5; phen = 1,10-phenanthroline; coum = 3-acetyl-4-hydroxylato-coumarin; Ln = Eu, Tb, Dy, Tm) and [Ln(coum)3(batho)]·0.7EtOH (Ln-batho, batho = 4,7-diphenyl-1,10-phenanthroline; Ln = Eu, Tb, Dy, Tm) were synthesized. The magnetic relaxation and photoluminescence behavior of these complexes was compared with that of the related compounds [Ln(coum)3(EtOH)(H2O)]·EtOH (Ln-coum), so as to investigate the effects of incorporating a second chromophore, either the phen or batho ligand, to the original coordination scaffold, provided with three coumarin (coum) ligands. Slow relaxation of the magnetization under H = 0 with moderate activation energies was observed for the Dy-phen (U/kB = 99.1 K) and Dy-batho (U/kB = 67.1 K) compounds, whereas Tb analogues presented field-induced single molecule magnet (SMM) behavior, with U/kB = 11.7 K (16.6 K@3 kOe) for Tb-phen (Tb-batho), respectively. Luminescent emission in the visible range was observed for all the Ln-coumarin based compounds upon ligand sensitization, with high quantum yields of 45 (40%) for Eu-phen (Eu-batho) compounds and 65-76-58% for Tb-coum, phen, batho analogues. Sensitization is mainly provided by the coumarin ligand having the energy difference ΔE between its triplet state T1 and the lanthanide emitting level closest to the optimum, while the second ligand can play either a synergistic or competing sensitizing role. The Tb-phen/batho compounds presented simultaneously SMM and luminescent behavior, with excellent values of the bifunctional figure of merit (ηSMM-QY ∼ 1000% K). The reported compounds represent a new class of bifunctional materials with potential interesting application in various fields.
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Affiliation(s)
- A Arauzo
- Servicio de Medidas Físicas. Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain and Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, Zaragoza, Spain
| | - L Gasque
- Facultad de Química, Universidad Nacional Autónoma de México, Avenida Universidad 3000, CDMX 04510, Mexico.
| | - S Fuertes
- Instituto de Síntesis Química y Catálisis Homogénea CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - C Tenorio
- Facultad de Química, Universidad Nacional Autónoma de México, Avenida Universidad 3000, CDMX 04510, Mexico.
| | - S Bernès
- Instituto de Física Luis Rivera Terrazas, BUAP, Edificio IF2, Lab. 103/104, 72570 Puebla, Mexico
| | - E Bartolomé
- Escola Universitària Salesiana de Sarrià (EUSS), Passeig Sant Joan Bosco 74, 08017-Barcelona, Spain.
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Sosa-Rivadeneyra MV, Venkatesan P, Flores-Manuel F, Bernès S, Höpfl H, Cerón M, Thamotharan S, Percino MJ. Quantitative analysis of intermolecular interactions in cocrystals and a pair of polymorphous cocrystal hydrates from 1,4-dihydroquinoxaline-2,3-dione and 1 H-benzo[ d]imidazol-2(3 H)-one with 2,5-dihydroxy-1,4-benzoquinones: a combined X-ray structural and theoretical analysis. CrystEngComm 2020. [DOI: 10.1039/d0ce01056a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Study and quantification of intermolecular interactions in five cocrystals and cocrystals hydrates by PIXEL, DFT, Hirshfeld surface and QTAIM calculations.
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Affiliation(s)
| | - Perumal Venkatesan
- Unidad de Polímeros y Electrónica Orgánica
- Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla
- Puebla
- Mexico
| | - Fermin Flores-Manuel
- Facultad de Ciencias Químicas
- Benemérita Universidad Autónoma de Puebla (BUAP)
- Puebla
- Mexico
| | - Sylvain Bernès
- Instituto de Física
- Benemérita Universidad Autónoma de Puebla (IFBUAP)
- Puebla
- Mexico
| | - Herbert Höpfl
- Centro de Investigaciones Químicas
- Instituto de Investigación en Ciencias Básicas y Aplicadas
- Universidad Autónoma del Estado de Morelos
- Cuernavaca
- Mexico
| | - Margarita Cerón
- Unidad de Polímeros y Electrónica Orgánica
- Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla
- Puebla
- Mexico
| | - Subbiah Thamotharan
- Biomolecular Crystallography Laboratory
- Department of Bioinformatics
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur
| | - M. Judith Percino
- Unidad de Polímeros y Electrónica Orgánica
- Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla
- Puebla
- Mexico
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Zeleny P, Arroyo M, Meléndez L, Bernès S. Tetrakis(2,3,5,6-tetrafluorobenzenethiolato-κ S)(triphenylphosphane-κ P)osmium(IV): a monoclinic polymorph. IUCr Data 2019. [DOI: 10.1107/s2414314619016225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
The structure of the title compound, [Os(C6HF4S)4{P(C6H5)3}], has been previously reported [Arroyo et al. (1994). J. Chem. Soc. Dalton Trans. pp. 1819–1824], in the space group P\overline{1}. We have now obtained a monoclinic polymorph for this compound, crystallized from ethanol, while the previous form was obtained from a hexane/chloroform mixture. The molecular structure is based on a trigonal–bipyramidal OsIV coordination geometry, close to that observed previously in the triclinic form.
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Rodríguez Tzompantzi T, Amaro Hernández AG, Meza-León RL, Bernès S. Deciphering the hydrogen-bonding scheme in the crystal structure of triphenylmethanol: a tribute to George Ferguson and co-workers. Acta Crystallogr C Struct Chem 2019; 75:1266-1273. [PMID: 31484815 PMCID: PMC6727172 DOI: 10.1107/s2053229619010714] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Accepted: 07/30/2019] [Indexed: 11/10/2022]
Abstract
The disordered crystal structure of triphenylmethanol features tetrahedral chiral clusters formed through weak hydrogen bonds, leading to the formation of three-dimensional supramolecular motifs having left or right handedness. The crystal structure of triphenylmethanol, C19H16O, has been redetermined using data collected at 295 and 153 K, and is compared to the model published by Ferguson et al. over 25 years ago [Ferguson et al. (1992 ▸). Acta Cryst. C48, 1272–1275] and that published by Serrano-González et al., using neutron and X-ray diffraction data [Serrano-González et al. (1999 ▸). J. Phys. Chem. B, 103, 6215–6223]. As predicted by these authors, the hydroxy groups are involved in weak intermolecular hydrogen bonds in the crystal, forming tetrahedral tetramers based on the two independent molecules in the asymmetric unit, one of which is placed on the threefold symmetry axis of the R space group. However, the reliable determination of the hydroxy H-atom positions is difficult to achieve, for two reasons. Firstly, a positional disorder affects the full asymmetric unit, which is split over two sets of positions, with occupancy factors of ca 0.74 and 0.26. Secondly, all hydroxy H atoms are further disordered, either by symmetry, or through a positional disorder in the case of parts placed in general positions. We show that the correct description of the hydrogen-bonding scheme is possible only if diffraction data are collected at low temperature. The prochiral character of the hydrogen-bonded tetrameric supramolecular clusters leads to enantiomorphic three-dimensional graphs in each tetramer. The crystal is thus a racemic mixture of supS and supR motifs, consistent with the centrosymmetric nature of the R space group.
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Affiliation(s)
- Tomasa Rodríguez Tzompantzi
- Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, Av. San Claudio y 18 Sur, 72570 Puebla, Pue., Mexico
| | - Aldo Guillermo Amaro Hernández
- Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, Av. San Claudio y 18 Sur, 72570 Puebla, Pue., Mexico
| | - Rosa Luisa Meza-León
- Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, Av. San Claudio y 18 Sur, 72570 Puebla, Pue., Mexico
| | - Sylvain Bernès
- Instituto de Física, Benemérita Universidad Autónoma de Puebla, Av. San Claudio y 18 Sur, 72570 Puebla, Pue., Mexico
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Torres S, Velasco M, Gallegos‐Rojas JÁ, Bernès S, Orea ML, Terán JL, Huelgas G, Gómez‐Calvario V, Juárez JR. A Concise Stereoselective Synthesis of ( R)‐2‐Benzylmorpholine and ML398 from ( R)‐(−)‐2‐Phenylglycinol. J Heterocycl Chem 2019. [DOI: 10.1002/jhet.3657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Saúl Torres
- Centro de Química, Instituto de CienciasBenemérita Universidad Autónoma de Puebla Edif. IC8, Complejo de Ciencias, C.U. 72570 Puebla Pue. Mexico
| | - Manuel Velasco
- Centro de Química, Instituto de CienciasBenemérita Universidad Autónoma de Puebla Edif. IC8, Complejo de Ciencias, C.U. 72570 Puebla Pue. Mexico
| | | | - Sylvain Bernès
- Instituto de FísicaBenemérita Universidad Autónoma de Puebla 1IF2 (aka 110‐B), Lab. 102, C.U. 72570 Puebla Pue. Mexico
| | - María L. Orea
- Centro de Química, Instituto de CienciasBenemérita Universidad Autónoma de Puebla Edif. IC8, Complejo de Ciencias, C.U. 72570 Puebla Pue. Mexico
| | - Joel L. Terán
- Centro de Química, Instituto de CienciasBenemérita Universidad Autónoma de Puebla Edif. IC8, Complejo de Ciencias, C.U. 72570 Puebla Pue. Mexico
| | - Gabriela Huelgas
- Departamento de Ciencias Químico‐BiológicasUniversidad de las Américas‐Puebla Sta. Catarina Mártir 72820 Cholula Pue. Mexico
| | - Víctor Gómez‐Calvario
- Centro de Química, Instituto de CienciasBenemérita Universidad Autónoma de Puebla Edif. IC8, Complejo de Ciencias, C.U. 72570 Puebla Pue. Mexico
| | - Jorge R. Juárez
- Centro de Química, Instituto de CienciasBenemérita Universidad Autónoma de Puebla Edif. IC8, Complejo de Ciencias, C.U. 72570 Puebla Pue. Mexico
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Gasque L, Zermeño E, Bernès S. 2,8-Dimethyl-5,11-bis[3-(methylsulfanyl)propyl]-1 H,7 H-diimidazo[ c, h][1,6]diazecine. IUCr Data 2019. [DOI: 10.1107/s2414314619004413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
The refinement of the crystal structure of the title compound, C20H34N6S2, was challenging, as a consequence of three issues: crystals are twinned, disordered, and include large empty voids corresponding to ca 8% of the unit-cell volume. A satisfactory model was obtained using data collected at 153 K. The diazecine ring is centrosymmetric, and displays the expected boat–chair–boat conformation. The 3-(methylsulfanyl)propyl chain is disordered over two sites with equal occupancies, and different conformations, i.e. trans–gauche–gauche for the first chain [Ndiaz—Cmeth—Cmeth—Cmeth torsion angles: 169.9 (4), 66.8 (5), 62.4 (5)°; diaz = diazecine and meth = methylene] and trans–trans–gauche for the second component [torsion angles: 169.9 (4), −177.6 (4), 64.4 (5)°]. In the crystal, N—H...N hydrogen bonds between imidazole rings are evident; weak intermolecular C—H...S contacts are also noted. The crystal studied was modelled as a two-component twin.
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Gasque L, Guzmán-Méndez Ó, Bernès S. Aquatris[1-(2,4-dioxo-2 H-1-benzopyran-3-ylidene)ethan-1-olato]ethanolgadolinium(III) ethanol monosolvate. IUCr Data 2019. [DOI: 10.1107/s2414314619004930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
The title compound, [Gd(C11H7O4)3(C2H5OH)(H2O)]·C2H5OH, was crystallized from ethanol, affording a solvate. The main ligand in the complex results from deprotonation of the hydroxy group in 3-acetyl-4-hydroxycoumarin (C11H8O4) and the resulting anionic ligands chelate the GdIII centre. Three anions, one ethanol and one water molecule are bonded to the lanthanide, giving an eight-coordinate metal centre with a slightly distorted trigonal–prismatic square-face-bicapped coordination geometry. All water and ethanol molecules participate in an intricate three-dimensional framework of hydrogen bonds. The complex is isostructural to the Tb and Dy compounds reported previously [Guzmán-Méndez et al. (2018). Inorg. Chem.
57, 908–911].
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Zeferino-Díaz R, Olivera-Castillo L, Dávalos A, Grant G, Kantún-Moreno N, Rodriguez-Canul R, Bernès S, Sandoval-Ramírez J, Fernández-Herrera MA. 22-Oxocholestane oximes as potential anti-inflammatory drug candidates. Eur J Med Chem 2019; 168:78-86. [DOI: 10.1016/j.ejmech.2019.02.035] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2018] [Revised: 02/02/2019] [Accepted: 02/10/2019] [Indexed: 12/31/2022]
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Sánchez-Lara E, Martínez-Valencia B, Corona-Motolinia ND, Sanchez-Gaytan BL, Castro ME, Bernès S, Méndez-Rojas MA, Meléndez-Bustamante FJ, González-Vergara E. A one-dimensional supramolecular chain based on [H 2V 10O 28] 4− units decorated with 4-dimethylaminopyridinium ions: an experimental and theoretical characterization. NEW J CHEM 2019. [DOI: 10.1039/c9nj02097g] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
One-dimensional supramolecular structure with [H2V10O28]4− units was synthesized and experimental-theoretical characterized as potential releasing prodrug of the decavanadate ion.
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Affiliation(s)
- Eduardo Sánchez-Lara
- Centro de Química del Instituto de Ciencias
- Benemérita Universidad Autónoma de Puebla. 18 Sur y Av. San Claudio
- Col. San Manuel
- Puebla
- Mexico
| | - Beatriz Martínez-Valencia
- Centro de Química del Instituto de Ciencias
- Benemérita Universidad Autónoma de Puebla. 18 Sur y Av. San Claudio
- Col. San Manuel
- Puebla
- Mexico
| | - Nidia D. Corona-Motolinia
- Centro de Química del Instituto de Ciencias
- Benemérita Universidad Autónoma de Puebla. 18 Sur y Av. San Claudio
- Col. San Manuel
- Puebla
- Mexico
| | - Brenda L. Sanchez-Gaytan
- Centro de Química del Instituto de Ciencias
- Benemérita Universidad Autónoma de Puebla. 18 Sur y Av. San Claudio
- Col. San Manuel
- Puebla
- Mexico
| | - María Eugenia Castro
- Centro de Química del Instituto de Ciencias
- Benemérita Universidad Autónoma de Puebla. 18 Sur y Av. San Claudio
- Col. San Manuel
- Puebla
- Mexico
| | - Sylvain Bernès
- Instituto de Física “Luis Rivera Terrazas”
- Benemérita Universidad Autónoma de Puebla
- Puebla
- Mexico
| | - Miguel A. Méndez-Rojas
- Departamento de Ciencias Químico-Biológicas
- Universidad de las Américas Puebla
- Exhacienda Sta. Catarina Mártir
- San Andrés Cholula
- 72820 Puebla
| | | | - Enrique González-Vergara
- Centro de Química del Instituto de Ciencias
- Benemérita Universidad Autónoma de Puebla. 18 Sur y Av. San Claudio
- Col. San Manuel
- Puebla
- Mexico
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Reyes Perea JA, Bernès S, Quintero Téllez MG. Packing polymorphism in the structure of trans-aqua-[ N, N'-bis-(salicyl-idene)ethane-1,2-di-amine-κ 4 O, N, N', O']chlorido-manganese(III) monohydrate. Acta Crystallogr E Crystallogr Commun 2018; 74:1778-1782. [PMID: 30574373 PMCID: PMC6281092 DOI: 10.1107/s2056989018015694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Accepted: 11/06/2018] [Indexed: 11/29/2022]
Abstract
The crystal structure of a second phase, which results from packing polymorphism, is described for a previously reported MnIII complex. The crystal structure of the title complex (systematic name: trans-aquachlorido{2,2′[ethane-1,2-diylbis(nitrilomethylidyne)]diphenolato-κ4O,N,N′,O′}manganese(III) monohydrate), [Mn(C16H14N2O2)Cl(H2O)]·H2O has been reported previously in the space group P21/n [Panja et al. (2003 ▸). Polyhedron, 22, 1191–1198]. We obtained the same hydrated complex through an alternative synthesis, and crystallized a new polymorph, in the space group P21. The molecular conformation of the complex is virtually unmodified, but the absence of the glide plane in the new polymorph halves the unit-cell parameter c, affording a non-centrosymmetric crystal structure with Z = 2, while the previously reported crystal is centrosymmetric with Z = 4. Both phases represent a case of packing polymorphism, similar to other dimorphic crystal structures retrieved from the Cambridge Structural Database.
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Affiliation(s)
- Juan Alberto Reyes Perea
- Facultad de Ciencias Físico Matemáticas, Benemérita Universidad Autónoma de Puebla, 72570 Puebla, Pue., Mexico
| | - Sylvain Bernès
- Instituto de Física, Benemérita Universidad Autónoma de Puebla, 72570 Puebla, Pue., Mexico
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Abstract
The crystal structure of ammonium metavanadate, NH4VO3, a compound widely used as a starting material for the synthesis of vanadium and polyoxidovanadate compounds, had been determined twice using single-crystal X-ray data [Syneček & Hanic (1954). Czech. J. Phys. 4, 120–129 (Weissenberg data); Hawthorne & Calvo (1977). J. Solid State Chem. 22, 157–170 (four-circle diffractometer data)]. Its structure is now redetermined at higher resolution using Ag Kα radiation, and the result is compared with the former refinements. Structural data for the polymeric [VO3]∞ chain remain unchanged, while more accurate parameters are obtained for the ammonium cation, improving the description of hydrogen-bonding interactions in the crystal structure.
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Diop MB, Diop L, Bernès S. fac-Triaqua(2,2′-bipyridine-κ 2
N, N′)(nitrato-κ O)cobalt(II) chloride. IUCr Data 2018. [DOI: 10.1107/s2414314618008660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
The asymmetric unit of the title complex, [Co(NO3)(C10H8N2)(H2O)3]Cl, consists of a chloride anion and a complex cation, which is built on a monodentate nitrate anion, three water molecules and one bidentate 2,2′-bipyridine molecule, coordinated to a CoII cation, in a distorted octahedral geometry. The water molecules are arranged in a facial geometry, and serve as donors for hydrogen bonding. Acceptor sites in the crystal are chloride ions and one O atom of the coordinating nitrate ion. A three-dimensional framework is formed, based on O—H...O and O—H...Cl contacts.
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Abstract
The hydrous title complex [systematic name: (1,1-dimethylbiguanide-κ2N2,N4)(2-oxidobenzoato-κ2O,O′)copper(II) trihydrate], [Cu(C7H4O3)(C4H11N5)]·3H2O, was synthesized electrolytically from an ethanolic solution of metformin hydrochloride, acetylsalicylic acid, Pepto-Bismol and a copper sacrificial anode. Diffraction data were collected at 0.56 Å resolution, allowing the accurate determination of H-atom positions in the neutral metformin ligand. Both imine groups in metformin have very similar N=C bond lengths, 1.2978 (17) and 1.3033 (17) Å, and the salicylate dianion behaves as a chelating ligand. The coordination sphere of the copper(II) cation deviates marginally from a square-planar arrangement. In the crystal, short Cu...Cu separations of 3.5476 (3) Å are observed, along with classical hydrogen-bonding interactions.
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Teixeira da Silva JA, Bernès S. Clarivate Analytics: Continued Omnia vanitas Impact Factor Culture. Sci Eng Ethics 2018; 24:291-297. [PMID: 28233146 DOI: 10.1007/s11948-017-9873-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2016] [Accepted: 01/09/2017] [Indexed: 05/10/2023]
Abstract
This opinion paper takes aim at an error made recently by Clarivate Analytics in which it sent out an email that congratulated academics for becoming exclusive members of academia's most cited elite, the Highly Cited Researchers (HCRs). However, that email was sent out to an undisclosed number of non-HCRs, who were offered an apology shortly after, through a bulk mail, which tried to down-play the importance of the error, all the while praising the true HCRs. When Clarivate Analytics senior management was contacted, the company declined to offer an indication of the number of academics who had been contacted and erroneously awarded the HCR status. We believe that this regrettable blunder, together with the opacity offered by the company, fortify the corporate attitude about the value of the journal impact factor (JIF), and what it represents, namely a marketing tool that is falsely used to equate citations with quality, worth, or influence. The continued commercialization of metrics such as the JIF is at the heart of their use to assess the "quality" of a researcher, their work, or a journal, and contributes to a great extent to driving scientific activities towards a futile endeavor.
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Affiliation(s)
| | - Sylvain Bernès
- Instituto de Física, Benemérita Universidad Autónoma de Puebla, San Claudio y 18 Sur s/n, 72570, Puebla, Mexico
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Pouye SF, Cissé I, Diop L, Ríos-Merino FJ, Bernès S. Monoclinic polymorph of chlorido-(dimethyl sulfoxide-κ O)tri-phenyl-tin(IV). Acta Crystallogr E Crystallogr Commun 2018; 74:163-166. [PMID: 29850045 PMCID: PMC5956328 DOI: 10.1107/s2056989018000439] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Accepted: 01/07/2018] [Indexed: 12/04/2022]
Abstract
The crystal structure of the title tin complex, [Sn(C6H5)3Cl(C2H6OS)], (I), has been reported with one mol-ecule in the asymmetric unit in an ortho-rhom-bic cell [Kumar et al. (2009 ▸). Acta Cryst. E65, m1602-m1603]. While using SnPh3Cl as a starting material for a reaction for which the products were recrystallized over a very long time (six months) from dimethyl sulfoxide (DMSO), a new polymorph was obtained for (I), with two independent mol-ecules in the asymmetric unit of a monoclinic cell. The coordination geometry of the Sn centres remains unchanged, with the Cl- ion and the DMSO mol-ecule in the apical positions and the phenyl C atoms in the equatorial positions of a trigonal bipyramid. The main difference between the polymorphs is the relative orientation of the phenyl rings in the equatorial plane, reflecting a degree of free rotation of these groups about their Sn-C bonds. In the crystal, mol-ecules are linked into [010] chains mediated by weak C-H⋯O inter-actions.
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Affiliation(s)
- Serigne Fallou Pouye
- Laboratoire de Chimie Minérale et Analytique, Département de Chimie, Faculté des Sciences et Techniques, Université Cheikh Anta Diop, Dakar, Senegal
| | - Ibrahima Cissé
- Laboratoire de Chimie Minérale et Analytique, Département de Chimie, Faculté des Sciences et Techniques, Université Cheikh Anta Diop, Dakar, Senegal
| | - Libasse Diop
- Laboratoire de Chimie Minérale et Analytique, Département de Chimie, Faculté des Sciences et Techniques, Université Cheikh Anta Diop, Dakar, Senegal
| | | | - Sylvain Bernès
- Instituto de Física, Benemérita Universidad Autónoma de Puebla, Av. San Claudio y 18 Sur, 72570 Puebla, Pue., Mexico
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Guzmán-Méndez Ó, González F, Bernès S, Flores-Álamo M, Ordóñez-Hernández J, García-Ortega H, Guerrero J, Qian W, Aliaga-Alcalde N, Gasque L. Coumarin Derivative Directly Coordinated to Lanthanides Acts as an Excellent Antenna for UV-Vis and Near-IR Emission. Inorg Chem 2018; 57:908-911. [PMID: 29308891 DOI: 10.1021/acs.inorgchem.7b02861] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A chelating coumarin-derived ligand sensitizes all emitting lanthanide ions in the solid state and gives high absolute quantum yields for ethanol solutions of complexes of Sm, Eu, Tb, and Dy, above 20% for the last two. Crystal structures of these four complexes are [Ln(Cum)3(H2O)(X)]·X where X = MeOH or EtOH.
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Affiliation(s)
- Óscar Guzmán-Méndez
- Facultad de Química, National Autonomous University of Mexico , Avenida Universidad 3000, CDMX 04510, Mexico
| | - Federico González
- Ingeniería de Procesos e Hidráulica, UAM Iztapalapa , San Rafael Atlixco 186, Col. Vicentina, CDMX 09340, Mexico
| | - Sylvain Bernès
- Instituto de Física, Benemérita Universidad Autónoma de Puebla , San Claudio y 18 Sur s/n Puebla, Puebla 72570, Mexico
| | - Marcos Flores-Álamo
- Facultad de Química, National Autonomous University of Mexico , Avenida Universidad 3000, CDMX 04510, Mexico
| | - Javier Ordóñez-Hernández
- Facultad de Química, National Autonomous University of Mexico , Avenida Universidad 3000, CDMX 04510, Mexico
| | - Héctor García-Ortega
- Facultad de Química, National Autonomous University of Mexico , Avenida Universidad 3000, CDMX 04510, Mexico
| | - Joselin Guerrero
- Facultad de Química, National Autonomous University of Mexico , Avenida Universidad 3000, CDMX 04510, Mexico
| | - Wenjie Qian
- Institute of Material Science of Barcelona, CSIC , Campus de la UAB, 08193 Bellaterra, Spain
| | - Nuria Aliaga-Alcalde
- Institució Catalana de Recerca i Estudis Avançats . Passeig Lluis Companys 23, 08010 Barcelona, Spain.,Institute of Material Science of Barcelona, CSIC , Campus de la UAB, 08193 Bellaterra, Spain
| | - Laura Gasque
- Facultad de Química, National Autonomous University of Mexico , Avenida Universidad 3000, CDMX 04510, Mexico
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Pérez-Benítez A, Bernès S. Does the compound hexaaqua-zinc( ii)bis(hydrogensulfate)dihydrate, [Zn(H 2O) 6](HSO 4·H 2O) 2, really exist? RSC Adv 2018; 8:34921-34925. [PMID: 35547030 PMCID: PMC9087299 DOI: 10.1039/c8ra05162c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2018] [Accepted: 10/02/2018] [Indexed: 11/30/2022] Open
Abstract
A careful examination of the crystal structure of the hydrogensulfate compound [Zn(H2O)6](HSO4·H2O)2 reported in this journal shows that the sample used for X-ray diffraction was almost certainly the Tutton salt [Zn(H2O)6](SO4·NH4)2, isoelectronic with the former elusive compound (F000 = 416, P21/c space group). Indeed, any chemistry involving ammonium and sulfate moieties in an aqueous medium containing a transition metal cation should afford the corresponding Tutton salt as a by-product. We redetermined the structure of [Zn(H2O)6](SO4·NH4)2, on the basis of high-resolution X-ray data (d = 0.47 Å), with the purpose of illustrating that at such resolution, difference Fourier maps may be used to unambiguously differentiate between a sulfate and a hydrogensulfate ion. On the other hand, regardless of the data resolution, geometrical considerations may be enough to avoid misassignment of such small ions in crystal structures, providing that some knowledge about the average shape of these ions is available from curated crystallographic databases. The structure published for the compound [Zn(H2O)6](HSO4·H2O)2 is re-interpreted as being the Tutton double salt [Zn(H2O)6](SO4·NH4)2, known for a long time.![]()
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Affiliation(s)
- Aarón Pérez-Benítez
- Facultad de Ciencias Químicas
- Benemérita Universidad Autónoma de Puebla
- 72570 Puebla
- Mexico
| | - Sylvain Bernès
- Instituto de Física Luis Rivera Terrazas
- Benemérita Universidad Autónoma de Puebla
- 72570 Puebla
- Mexico
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Velasco Ximello M, Bernès S, Pérez-Benítez A, Hernández Pareja U, Mendoza A, Juárez Posadas JR, Vázquez Bravo J. Crystal structure of r-1, c-2-dibenzoyl- t-3, t-4-bis-(2-nitro-phen-yl)cyclo-butane. Acta Crystallogr E Crystallogr Commun 2017; 73:1866-1870. [PMID: 29250404 PMCID: PMC5730241 DOI: 10.1107/s2056989017015936] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/14/2017] [Accepted: 11/01/2017] [Indexed: 11/10/2022]
Abstract
The condensation reaction of aceto-phenone (1-phenyl-ethan-1-one) with 2-nitro-benzaldehyde in the molten state yielded the expected chalcone, (E)-3-(2-nitro-phen-yl)-1-phenyl-prop-2-en-1-one, and, unexpectedly, the title compound, C30H22N2O6, which results from the syn head-to-head [2 + 2] cyclo-addition of the chalcone. The mol-ecular structure of the dimer shows that the four benzene rings of the substituents are oriented in such a way that potential steric hindrance is minimized, whilst allowing some degree of inter-molecular π-π inter-actions for crystal stabilization. In the mol-ecule, one nitro group is disordered over two positions, with occupancies for each part of 0.876 (7) and 0.127 (7).
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Affiliation(s)
- Manuel Velasco Ximello
- Centro de Química, Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla, Edif. IC8 Complejo de Ciencias, C.U., 72570 Puebla, Pue., Mexico
| | - Sylvain Bernès
- Instituto de Física, Benemérita Universidad Autónoma de Puebla, Av. San Claudio y 18 Sur, 72570 Puebla, Pue., Mexico
| | - Aarón Pérez-Benítez
- Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, Av. San Claudio y 18 Sur, 72570 Puebla, Pue., Mexico
| | - Ulises Hernández Pareja
- Centro de Química, Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla, Edif. IC8 Complejo de Ciencias, C.U., 72570 Puebla, Pue., Mexico
| | - Angel Mendoza
- Centro de Química, Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla, Edif. IC8 Complejo de Ciencias, C.U., 72570 Puebla, Pue., Mexico
| | - Jorge R Juárez Posadas
- Centro de Química, Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla, Edif. IC8 Complejo de Ciencias, C.U., 72570 Puebla, Pue., Mexico
| | - Jaime Vázquez Bravo
- Ingeniería en Biotecnología, Universidad Politécnica Metropolitana de Puebla, Popocatépetl s/n, Tres Cerritos, 72480 Puebla, Pue., Mexico
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Setifi Z, Bernès S, Setifi F, Kaur M, Jasinski JP. fac-Bis[bis(pyridin-2-yl)methanamine]iron(II) bis(1,1,3,3-tetracyano-2-ethoxypropenide) dihydrate. IUCr Data 2017. [DOI: 10.1107/s2414314617010070] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
The hydrated complex [Fe(DIPA)2](tcnoet)2·2H2O [DIPA is bis(pyridin-2-yl)methanamine, C11H11N3, and tcnoet is the anion 1,1,3,3-tetracyano-2-ethoxypropenide, C9H5N4O−], crystallizes with the [Fe(DIPA)2]2+ cation located on an inversion centre. The coordination geometry for FeII is strongly distorted from octahedral, as a consequence of the bite angles formed by the tridentate DIPA ligand. The water molecules included in the voids left by the cations and anions form hydrogen bonds with the cyano and amine groups.
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Pouye SF, Cisse I, Diop L, Dolmella A, Bernès S. Crystal structure of μ-oxalato-κ 2O1: O2-bis-[(dimethyl sulfoxide-κ O)tri-phenyl-tin(IV)]. Acta Crystallogr E Crystallogr Commun 2017; 73:1033-1036. [PMID: 28775876 PMCID: PMC5499284 DOI: 10.1107/s2056989017008519] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Accepted: 06/07/2017] [Indexed: 11/17/2022]
Abstract
The structure of the studied adduct consists of two dimethyl sulfoxide molecules coordinating the [C2O4(SnPh3)2] core via their oxygen atoms. The Sn atoms display a trans trigonal–bipyramidal [SnC3O2] arrangement, and the oxalate dianion behaves as a bidentate bridging ligand. In the previously reported [C2O4(SnPh3)2] complex [Diop et al. (2003 ▸). Appl. Organomet. Chem.17, 881–882.], the SnIV atoms are able to formally complete their coordination by addition of dimethyl sulfoxide (DMSO) molecules provided by the reaction medium, affording the title complex, [Sn2(C6H5)6(C2O4)(C2H6OS)2]. The SnIV atoms are then pentacoordinated, with a common trans trigonal–bipyramidal arrangement. The asymmetric unit contains one half-molecule, which is completed by inversion symmetry in space group type C2/c. The inversion centre is placed at the mid-point of the central bis-monodentate oxalate dianion, C2O42−, which bridges the [(SnPh3)(DMSO)] moieties. The molecule crystallizes as a disordered system, with two phenyl rings disordered by rotation about their Sn—C bonds, while the DMSO molecule is split over two positions due to a tetrahedral inversion at the S atom. All disordered parts were refined with occupancies fixed of 0.5.
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Affiliation(s)
- Serigne Fallou Pouye
- Laboratoire de Chimie Minérale et Analytique, Département de Chimie, Faculté des Sciences et Techniques, Université Cheikh Anta Diop, Dakar, Senegal
| | - Ibrahima Cisse
- Laboratoire de Chimie Minérale et Analytique, Département de Chimie, Faculté des Sciences et Techniques, Université Cheikh Anta Diop, Dakar, Senegal
| | - Libasse Diop
- Laboratoire de Chimie Minérale et Analytique, Département de Chimie, Faculté des Sciences et Techniques, Université Cheikh Anta Diop, Dakar, Senegal
| | - Alessandro Dolmella
- Universita di Padova, Dipartimento di Scienze del Farmaco RMXS, Laboratorio di Radiofarmacia, Modellistica Molecolare e Diffrattometria a Raggi X, Via Francesco Marzolo 5, 35131, Padova, Italy
| | - Sylvain Bernès
- Instituto de Física, Benemérita Universidad Autónoma de Puebla, Av. San Claudio y 18 Sur, 72570 Puebla, Pue., Mexico
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