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Osuský P, Smolíček M, Nociarová J, Rakovský E, Hrobárik P. One-Pot Reductive Methylation of Nitro- and Amino-Substituted (Hetero)Aromatics with DMSO/HCOOH: Concise Synthesis of Fluorescent Dimethylamino-Functionalized Bibenzothiazole Ligands with Tunable Emission Color upon Complexation. J Org Chem 2022; 87:10613-10629. [PMID: 35917477 DOI: 10.1021/acs.joc.2c00732] [Citation(s) in RCA: 1] [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: 02/04/2023]
Abstract
One-pot reductive N,N-dimethylation of suitable nitro- and amino-substituted (hetero)arenes can be achieved using a DMSO/HCOOH/Et3N system acting as a low-cost but efficient reducing and methylating agent. The transformation of heteroaryl-amines can be accelerated by using dimethyl sulfoxide/oxalyl chloride or chloromethyl methyl sulfide as the source of active CH3SCH2+ species, while the exclusion of HCOOH in the initial stage of the reaction allows avoiding N-formamides as resting intermediates. The developed procedures are applicable in multigram-scale synthesis, and because of the lower electrophilicity of CH3SCH2+, they also work in pathological cases, where common methylating agents provide N,N-dimethylated products in no yield or inferior yields due to concomitant side reactions. The method is particularly useful in one-pot reductive transformation of 2-H-nitrobenzazoles to corresponding N,N-dimethylamino-substituted heteroarenes. These, upon Cu(II)-catalyzed oxidative homocoupling, afford 2,2'-bibenzazoles substituted with dimethylamino groups as charge-transfer N^N ligands with intensive absorption/emission in the visible region. The fluorescence of NMe2-functionalized bibenzothiazoles remains intensive even upon complexation with ZnCl2, while emission maxima are bathochromically shifted from the green/yellow to orange/red spectral region, making these small-molecule fluorophores, exhibiting large emission quantum yields and Stokes shifts, an attractive platform for the construction of various functional dyes and light-harvesting materials with tunable emission color upon complexation.
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Affiliation(s)
- Patrik Osuský
- Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University, SK-84215 Bratislava, Slovakia
| | - Maroš Smolíček
- Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University, SK-84215 Bratislava, Slovakia
| | - Jela Nociarová
- Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University, SK-84215 Bratislava, Slovakia
| | - Erik Rakovský
- Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University, SK-84215 Bratislava, Slovakia
| | - Peter Hrobárik
- Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University, SK-84215 Bratislava, Slovakia
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Peňaška T, Modrocká V, Stankovianska K, Mečiarová M, Rakovský E, Šebesta R. Organocatalytic Diastereodivergent Enantioselective Formal oxa-Diels-Alder Reaction of Unsaturated Ketones with Enoates Under Liquid-Assisted Grinding Conditions. ChemSusChem 2022; 15:e202200028. [PMID: 35146952 DOI: 10.1002/cssc.202200028] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [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: 01/05/2022] [Revised: 02/10/2022] [Indexed: 06/14/2023]
Abstract
Chiral heterocycles occur in many compounds of interest, but their efficient synthesis is challenging. This study concerns the enantioselective and diastereoselective synthesis of densely substituted chiral pyran derivatives. Diastereodivergence of the oxa-Diels-Alder reaction is achieved by using either a bifunctional amino-thiourea or a monofunctional quinine organocatalyst under ball-milling conditions. Liquid-assisted grinding proves a highly efficient means of affording pyrans in high yield, with high enantiomeric purities and short reaction times.
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Affiliation(s)
- Tibor Peňaška
- Department of Organic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská dolina, Ilkovičova 6, 842 15, Bratislava, Slovakia
| | - Viktória Modrocká
- Department of Organic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská dolina, Ilkovičova 6, 842 15, Bratislava, Slovakia
| | - Klára Stankovianska
- Department of Organic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská dolina, Ilkovičova 6, 842 15, Bratislava, Slovakia
| | - Mária Mečiarová
- Department of Organic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská dolina, Ilkovičova 6, 842 15, Bratislava, Slovakia
| | - Erik Rakovský
- Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská dolina, Ilkovičova 6, 842 15, Bratislava, Slovakia
| | - Radovan Šebesta
- Department of Organic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská dolina, Ilkovičova 6, 842 15, Bratislava, Slovakia
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Plevová K, Kisszékelyi P, Vargová D, Andrejčák S, Tóth V, Fertáľ L, Rakovský E, Filo J, Šebesta R. Diastereoselective Double C-H Functionalization of Chiral Ferrocenes with Heteroaromatics. Chemistry 2021; 27:15501-15507. [PMID: 34524717 DOI: 10.1002/chem.202102624] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [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: 07/16/2021] [Indexed: 01/08/2023]
Abstract
Diastereoselective double C-H heteroarylation of chiral ferrocenes provides valuable compounds with multiple functionalities using mild reaction conditions and simple reagents. Pd-Complexes with chiral mono-protected amino acids afforded corresponding heteroarylated ferrocenyl amines in good yields and high diastereomeric purities. In this way, a variety of indole, thiophene, pyrrole, or furan substituents were introduced to the ferrocene moiety. Furthermore, a range of relevant functional groups, for example ketone, ester, chloro, nitro, or silyl, are tolerated by this method. An alternative combination of amino acid and ferrocenyl amine configurations was leveraged to provide the complementary diastereomeric products. The products of C-H heteroarylation can be transformed into corresponding phosphines. Absolute configurations of CH-activation products were confirmed by the combination of X-ray crystallographic analysis and CD spectroscopy. 19 F NMR kinetic study and DFT calculations provided insights into the reaction mechanism and reasons governing stereoinduction.
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Affiliation(s)
- Kristína Plevová
- Department of Organic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava Mlynska dolina, Ilkovičova 6, 842 15 Bratislava, Slovakia
| | - Péter Kisszékelyi
- Department of Organic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava Mlynska dolina, Ilkovičova 6, 842 15 Bratislava, Slovakia
| | - Denisa Vargová
- Department of Organic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava Mlynska dolina, Ilkovičova 6, 842 15 Bratislava, Slovakia
| | - Samuel Andrejčák
- Department of Organic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava Mlynska dolina, Ilkovičova 6, 842 15 Bratislava, Slovakia
| | - Viktor Tóth
- Department of Organic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava Mlynska dolina, Ilkovičova 6, 842 15 Bratislava, Slovakia
| | - Lukáš Fertáľ
- Department of Organic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava Mlynska dolina, Ilkovičova 6, 842 15 Bratislava, Slovakia
| | - Erik Rakovský
- Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava Mlynska dolina, Ilkovičova 6, 842 15 Bratislava, Slovakia
| | - Juraj Filo
- Department of Organic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava Mlynska dolina, Ilkovičova 6, 842 15 Bratislava, Slovakia
| | - Radovan Šebesta
- Department of Organic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava Mlynska dolina, Ilkovičova 6, 842 15 Bratislava, Slovakia
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Nociarová J, Osuský P, Rakovský E, Georgiou D, Polyzos I, Fakis M, Hrobárik P. Direct Iodination of Electron-Deficient Benzothiazoles: Rapid Access to Two-Photon Absorbing Fluorophores with Quadrupolar D-π-A-π-D Architecture and Tunable Heteroaromatic Core. Org Lett 2021; 23:3460-3465. [PMID: 33886341 DOI: 10.1021/acs.orglett.1c00893] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Direct iodination of benzothiazoles under strong oxidative/acidic conditions leads to a mixture of iodinated heteroarenes with 1-2 major components, which are easily separable and which structures depend on the I2 equivalents used. Among the unexpected but dominant products were identified 4,7-diiodobenzothiazoles with a rare substitution pattern for SEAr reactions of this scaffold. These were employed in the synthesis of 4,7-bis(triarylamine-ethynyl)benzothiazoles - a new class of highly efficient quasi-quadrupolar fluorophores displaying large two-photon absorption cross sections (540-1374 GM) in the near-infrared region.
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Affiliation(s)
- Jela Nociarová
- Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University, SK-84215 Bratislava, Slovakia
| | - Patrik Osuský
- Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University, SK-84215 Bratislava, Slovakia
| | - Erik Rakovský
- Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University, SK-84215 Bratislava, Slovakia
| | - Dimitris Georgiou
- Department of Physics, University of Patras, GR-26504 Patras, Greece
| | - Ioannis Polyzos
- Department of Physics, University of Patras, GR-26504 Patras, Greece
| | - Mihalis Fakis
- Department of Physics, University of Patras, GR-26504 Patras, Greece
| | - Peter Hrobárik
- Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University, SK-84215 Bratislava, Slovakia.,Laboratory for Advanced Materials, Comenius University Science Park, Ilkovičova 8, SK-84215 Bratislava, Slovakia
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5
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Peňaška T, Palchykov V, Rakovský E, Addová G, Šebesta R. Stereoselective Organocatalytic Construction of Spiro Oxindole Pyrrolidines Using Unsaturated α‐Ketoesters and α‐Ketoamides. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100022] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Tibor Peňaška
- Department of Organic Chemistry Faculty of Natural Sciences Comenius University in Bratislava Mlynská dolina, Ilkovičova 6 84215 Bratislava Slovakia
| | - Vitalii Palchykov
- Department of Organic Chemistry Faculty of Natural Sciences Comenius University in Bratislava Mlynská dolina, Ilkovičova 6 84215 Bratislava Slovakia
- Research Institute of Chemistry and Geology Oles Honchar Dnipro National University Gagarina Av. 72 Dnipro 49010 Ukraine
| | - Erik Rakovský
- Department of Inorganic Chemistry Faculty of Natural Sciences Comenius University in Bratislava Mlynská dolina, Ilkovičova 6 84215 Bratislava Slovakia
| | - Gabriela Addová
- Department of Organic Chemistry Faculty of Natural Sciences Comenius University in Bratislava Mlynská dolina, Ilkovičova 6 84215 Bratislava Slovakia
| | - Radovan Šebesta
- Department of Organic Chemistry Faculty of Natural Sciences Comenius University in Bratislava Mlynská dolina, Ilkovičova 6 84215 Bratislava Slovakia
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Furka D, Furka S, Naftaly M, Rakovský E, Čaplovičová M, Janek M. ZnO nanoparticles as photodegradation agent controlled by morphology and boron doping. Catal Sci Technol 2021. [DOI: 10.1039/d0cy01802c] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
ZnO nanoparticles with different morphology and doping possess different atomic planes at their interfaces. This changed their catalytic efficiency during degradation experiments with dyes, significantly dependent also on used dopant concentrations.
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Affiliation(s)
- Daniel Furka
- Faculty of Natural Sciences
- Department of Physical and Theoretical Chemistry
- Comenius University
- 84104-Bratislava
- SK
| | - Samuel Furka
- Faculty of Natural Sciences
- Department of Physical and Theoretical Chemistry
- Comenius University
- 84104-Bratislava
- SK
| | | | - Erik Rakovský
- Faculty of Natural Sciences
- Department of Inorganic Chemistry
- Comenius University
- 84104-Bratislava
- SK
| | - Mária Čaplovičová
- University Science Park Bratislava Centre
- Slovak University of Technology in Bratislava
- 812 43 Bratislava
- SK
| | - Marián Janek
- Faculty of Natural Sciences
- Department of Physical and Theoretical Chemistry
- Comenius University
- 84104-Bratislava
- SK
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Plevová K, Mudráková B, Rakovský E, Šebesta R. Diastereoselective Pd-Catalyzed C–H Arylation of Ferrocenylmethanamines with Arylboronic Acids or Pinacol Esters. J Org Chem 2019; 84:7312-7319. [DOI: 10.1021/acs.joc.9b00953] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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8
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Kuchtanin V, Kleščíková L, Šoral M, Fischer R, Růžičková Z, Rakovský E, Moncoľ J, Segľa P. Nickel(II) Schiff base complexes: Synthesis, characterization and catalytic activity in Kumada–Corriu cross-coupling reactions. Polyhedron 2016. [DOI: 10.1016/j.poly.2016.05.037] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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10
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Drusan M, Rakovský E, Marek J, Šebesta R. Asymmetric One-Pot Conjugate Addition of Grignard Reagents to α,β-Unsaturated Compounds Followed by Reaction with Carbenium Ions. Adv Synth Catal 2015. [DOI: 10.1002/adsc.201500074] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Hrobárik P, Hrobáriková V, Semak V, Kasák P, Rakovský E, Polyzos I, Fakis M, Persephonis P. Quadrupolar Benzobisthiazole-Cored Arylamines as Highly Efficient Two-Photon Absorbing Fluorophores. Org Lett 2014; 16:6358-61. [DOI: 10.1021/ol503137p] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Peter Hrobárik
- Institute
of Chemistry, Technical University of Berlin, Strasse des 17. Juni 135, D-10623 Berlin, Germany
| | - Veronika Hrobáriková
- Institute
of Chemistry, Technical University of Berlin, Strasse des 17. Juni 135, D-10623 Berlin, Germany
| | - Vladislav Semak
- Institute
of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
- Polymer
Institute, Slovak Academy of Sciences, Dúbravská cesta 9, SK-84541 Bratislava, Slovakia
| | - Peter Kasák
- Center
for Advanced Materials, Qatar University, P.O. Box 2713, Doha, Qatar
| | - Erik Rakovský
- Department
of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University, SK-84215 Bratislava, Slovakia
| | - Ioannis Polyzos
- Department
of Physics, University of Patras, GR-26504 Patras, Greece
| | - Mihalis Fakis
- Department
of Physics, University of Patras, GR-26504 Patras, Greece
| | - Peter Persephonis
- Department
of Physics, University of Patras, GR-26504 Patras, Greece
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12
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Krivosudský L, Rakovský E. catena-Poly[[(pyrazine-2-carboxamide-κN (4))copper(I)]-μ3-iodido]. Acta Crystallogr Sect E Struct Rep Online 2014; 70:m267-m268. [PMID: 25161528 PMCID: PMC4120587 DOI: 10.1107/s1600536814013695] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2014] [Accepted: 06/11/2014] [Indexed: 06/03/2023]
Abstract
In the title metal-organic polymeric complex, [CuI(C5H5N3O)] n , the asymmetric unit is composed of one monomer unit of the polymer and one Cu(I) atom linked to one iodide anion and one pyrazine-2-carboxamide mol-ecule. The Cu(I) atom is in a distorted tetra-hedral coordination completed by one pyrazine N atom of the pyrazine-2-carboxamide ligand and three iodide anions. The polymeric structure adopts a well-known ladder-like motif of {CuNI3} tetra-hedra running in the b-axis direction. The mol-ecules of the organic ligand are connected via medium-to-strong N-H⋯O and N-H⋯N hydrogen bonds and weak π-π inter-actions [the distance between two parallel planes of the rings is 3.5476 (14) Å and the centroid-centroid contact is 4.080 (2) Å]. The title compound has a relatively high decomposition temperature (564 K) as a result of relatively strong covalent and non-covalent inter-actions inside and between the chains.
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Affiliation(s)
- Lukáš Krivosudský
- Comenius University, Faculty of Natural Sciences, Department of Inorganic Chemistry, Mlynská dolina CH2, 842 15 Bratislava, Slovak Republic
| | - Erik Rakovský
- Comenius University, Faculty of Natural Sciences, Department of Inorganic Chemistry, Mlynská dolina CH2, 842 15 Bratislava, Slovak Republic
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Rakovský E, Krivosudský L. Tetrakis(2,6-di-methyl-pyridinium) di-hydrogen deca-vanadate dihydrate. Acta Crystallogr Sect E Struct Rep Online 2014; 70:m225-6. [PMID: 24940209 PMCID: PMC4051003 DOI: 10.1107/s1600536814011118] [Citation(s) in RCA: 3] [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] [Received: 02/21/2014] [Accepted: 05/14/2014] [Indexed: 11/10/2022]
Abstract
The structure of the title compound, (C7H10N)4[H2V10O28]·2H2O, was solved from a non-merohedrally twinned crystal (ratio of twin components ∼0.6:0.4). The asymmetric unit consists of one-half decavanadate anion (the other half completed by inversion symmetry), two 2,6-dimethylpyridinium cations and one water molecule of crystallization. In the crystal, the components are connected by strong N—H⋯O and O—H⋯O hydrogen bonds, forming a supramolecular chain along the b-axis direction. There are weak C—H⋯O interactions between the chains.
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Affiliation(s)
- Erik Rakovský
- Comenius University, Faculty of Natural Sciences, Department of Inorganic Chemistry, Mlynská dolina CH2, 842 15 Bratislava, Slovak Republic
| | - Lukáš Krivosudský
- Comenius University, Faculty of Natural Sciences, Department of Inorganic Chemistry, Mlynská dolina CH2, 842 15 Bratislava, Slovak Republic
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Bartošová L, Padělková Z, Rakovský E, Schwendt P. Synthesis and crystal structure of two copper(II) complexes with coordinated decavanadate ion. Polyhedron 2012. [DOI: 10.1016/j.poly.2011.10.042] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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Kowal K, Wysocka-Król K, Kopaczyńska M, Dworniczek E, Franiczek R, Wawrzyńska M, Vargová M, Zahoran M, Rakovský E, Kuš P, Plesch G, Plecenik A, Laffir F, Tofail SA, Podbielska H. In situ photoexcitation of silver-doped titania nanopowders for activity against bacteria and yeasts. J Colloid Interface Sci 2011; 362:50-7. [DOI: 10.1016/j.jcis.2011.06.035] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2011] [Revised: 06/10/2011] [Accepted: 06/11/2011] [Indexed: 10/18/2022]
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Csizmadiová J, Mečiarová M, Rakovský E, Horváth B, Šebesta R. [5]Ferrocenophanene-Phosphane Ligands for Enantioselective Rh-Catalyzed Conjugate Additions. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100908] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Klištincová L, Rakovský E, Schwendt P, Plesch G, Gyepes R. Synthesis, structure and characterization of (NH4)2[Cu2(H2O)4(NH3CH2COO)2(NH2CH2COO)2]H2V10O28·6H2O. INORG CHEM COMMUN 2010. [DOI: 10.1016/j.inoche.2010.07.014] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [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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Doktorovová S, Araújo J, Garcia ML, Rakovský E, Souto EB. Formulating fluticasone propionate in novel PEG-containing nanostructured lipid carriers (PEG-NLC). Colloids Surf B Biointerfaces 2009; 75:538-42. [PMID: 19879736 DOI: 10.1016/j.colsurfb.2009.09.033] [Citation(s) in RCA: 84] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2009] [Revised: 08/17/2009] [Accepted: 09/22/2009] [Indexed: 10/20/2022]
Abstract
The aim of this study was to develop nanostructured lipid carriers (NLC) for topical delivery of fluticasone propionate (FP) with the aim to further improve the safety profile and decrease the adverse-side effects commonly reported in topical corticotherapy. NLC are colloidal drug-carriers consisting of a blend of a solid lipid and a small amount of liquid lipid since these carriers have proved to be effective in epidermal targeting in particular of glucocorticoids. NLC consisting of glyceryl palmito-stearate, and PEG-containing medium chain triglycerides mixture, stabilised by polysorbate 80 and soybean phosphatidylcholine were prepared. A mean particle size between 380 and 408 nm and entrapment efficacy of 95% were obtained for FP-loaded NLC. The crystallinity and polymorphic phase behaviour of FP-free and FP-loaded NLC were examined by differential scanning calorimetry and wide angle X-ray diffraction. Results revealed a low-crystalline structure and confirmed the incorporation of FP into the particles. The suitability of PEG-containing liquid lipids to form the lipid matrix of NLC was also confirmed.
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Affiliation(s)
- Slavomíra Doktorovová
- Fernando Pessoa University, Faculty of Health Sciences, Rua Carlos da Maia 296, P-4300-150 Porto, Portugal
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Klistincová L, Rakovský E, Schwendt P. Bis[2-(2-hydroxyethyl)pyridinium] mu-decavanadato-bis[pentaaquamanganate(II)] tetrahydrate. Acta Crystallogr C 2009; 65:m97-9. [PMID: 19190381 DOI: 10.1107/s0108270109001917] [Citation(s) in RCA: 7] [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] [Received: 11/25/2008] [Accepted: 01/15/2009] [Indexed: 11/11/2022] Open
Abstract
The structure of the title compound, (C(7)H(10)NO)(2)[Mn(2)V(10)O(28)(H(2)O)(10)].4H(2)O or (C(5)H(4)NHCH(2)CH(2)OH)(2)[{Mn(H(2)O)(5)}(2)V(10)O(28)].4H(2)O, at 293 (2) K has triclinic (P\overline{1}) symmetry. The asymmetric unit consists of one half of a decavanadate anion of C(i) symmetry, one [Mn(H(2)O)(5)](2+) group, one 2-(2-hydroxyethyl)pyridinium cation and two solvent water molecules. The decavanadate ion bridges between two [Mn(H(2)O)(5)](2+) groups, thus forming a dodecanuclear complex unit. Complex units are connected via a hydrogen-bonding network, forming supramolecular layers lying in the (001) plane. Cations and solvent water molecules are located between these layers.
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Affiliation(s)
- Lenka Klistincová
- Comenius University, Faculty of Natural Sciences, Department of Inorganic Chemistry, Mlynská dolina, 842 15 Bratislava, Slovak Republic
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Klištincová L, Rakovský E, Schwendt P. Decavanadate ion as bridging ligand. Synthesis and crystal structure of (NH4)2[Cu2(NH3CH2CH2COO)4(V10O28)]·10H2O. INORG CHEM COMMUN 2008. [DOI: 10.1016/j.inoche.2008.06.020] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Pacigová S, Rakovský E, Sivák M, Zák Z. Hexakis[3-(aminocarbonyl)pyridinium] decavanadate(V) dihydrate. Acta Crystallogr C 2007; 63:m419-22. [PMID: 17762113 DOI: 10.1107/s0108270107028557] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2007] [Accepted: 06/11/2007] [Indexed: 11/10/2022] Open
Abstract
The structure of the title compound, (C(6)H(7)N(2)O)(6)[V(10)O(28)].2H2O, at 120 (2) K has monoclinic (C2/c) symmetry. The asymmetric unit consists of one half-decavanadate anion of Ci symmetry, three cations and one water molecule. Each water molecule is hydrogen bonded to two decavanadate anions, thus forming a one-dimensional chain of anions. The three-dimensional supramolecular structure is formed by a network of N-H...O, O-H...O and C-H...O hydrogen bonds, in which the cations, anions and water molecules are involved, and by nonparallel-displaced pi-stacking interactions between pyridine rings. As a result of hydrogen bonding, the carboxamide groups of the cations are somewhat twisted from the pyridine ring plane.
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Affiliation(s)
- Silvia Pacigová
- Department of Inorganic Chemistry, Comenius University, Faculty of Natural Sciences, Mlynská dolina, 842 15 Bratislava, Slovak Republic
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Joniaková D, Gyepes R, Rakovský E, Schwendt P, Žúrková L, Marek J, Mička Z. Structural variability of copper-1,10-phenanthroline–oxovanadate hybrid inorganic–organic compounds. Polyhedron 2006. [DOI: 10.1016/j.poly.2006.02.020] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Rakovský E, Joniaková D, Gyepes R, Schwendt P, Mička Z. Synthesis and crystal structure of [CuCl(phen)2]3H3V10O28 · 7 H2O. Cryst Res Technol 2005. [DOI: 10.1002/crat.200410415] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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