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Parisi E, Landi A, Fusco S, Manfredi C, Peluso A, Wahler S, Klapötke TM, Centore R. High-Energy-Density Materials: An Amphoteric N-Rich Bis(triazole) and Salts of Its Cationic and Anionic Species. Inorg Chem 2021; 60:16213-16222. [PMID: 34636552 PMCID: PMC8564754 DOI: 10.1021/acs.inorgchem.1c02002] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
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The synthesis and
characterization of the N-rich bis(triazole)
compound 1H,4′H-[3,3′-bis(1,2,4-triazole)]-4′,5,5′-triamine
(C4H7N9) with a N content of 69.6%
by weight is reported. The compound exhibits a rich acid–base
behavior because it can accept up to two protons, forming a monocation
and a dication, and can lose one proton, forming an anion. Measurement
of the acid constants has shown that there exist well-defined pH intervals
in which each of the four species is predominant in solution, opening
the way to their isolation and characterization by single-crystal
X-ray analysis as salts with different counterions. Some energetic
salts of the monocation or dication containing oxidizing inorganic
counterions (dinitramide, perchlorate, and nitrate) were also prepared
and characterized in the solid state for their sensitivity. In particular,
the neutral compound shows a very remarkable thermal stability in
air, with Td = 347 °C, and is insensitive
to impact and friction. Salts of the dication with energetic counterions,
in particular perchlorate and nitrate, show increased sensitivities
and reduced thermal stability. The salt of the monocation with dinitramide
as the counterion outperforms other dinitramide salts reported in
the literature because of its higher thermal stability (Td = 230 °C in air) and friction insensitiveness. An energetic, N-rich compound that, depending
on the pH,
can exist as neutral, singly protonated, doubly protonated, and deprotonated
species is shown.
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Affiliation(s)
- Emmanuele Parisi
- Department of Chemical Sciences, University of Naples Federico II, Via Cinthia, I-80126 Naples, Italy
| | - Alessandro Landi
- Department of Chemistry and Biology, University of Salerno, Via Giovanni Paolo II, 132, I-84084 Fisciano, Salerno, Italy
| | - Sandra Fusco
- Department of Chemical Sciences, University of Naples Federico II, Via Cinthia, I-80126 Naples, Italy
| | - Carla Manfredi
- Department of Chemical Sciences, University of Naples Federico II, Via Cinthia, I-80126 Naples, Italy
| | - Andrea Peluso
- Department of Chemistry and Biology, University of Salerno, Via Giovanni Paolo II, 132, I-84084 Fisciano, Salerno, Italy
| | - Sabrina Wahler
- Department of Chemistry, Energetic Materials Research, Ludwig-Maximilian University, Butenandtstrasse 5-13, D-81377 Münich, Germany
| | - Thomas M Klapötke
- Department of Chemistry, Energetic Materials Research, Ludwig-Maximilian University, Butenandtstrasse 5-13, D-81377 Münich, Germany
| | - Roberto Centore
- Department of Chemical Sciences, University of Naples Federico II, Via Cinthia, I-80126 Naples, Italy
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Parisi E, Centore R. Stabilization of an elusive tautomer by metal coordination. ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY 2021; 77:395-401. [PMID: 34216445 PMCID: PMC8254526 DOI: 10.1107/s2053229621006203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Accepted: 06/16/2021] [Indexed: 11/11/2022]
Abstract
The solid-state isolation of the different tautomers of a chemical compound can be a challenging problem. In many cases, tautomers with an energy very close to the most stable one cannot be isolated (elusive tautomers). In this article, with reference to the 4-methyl-7-(pyrazin-2-yl)-2H-[1,2,4]triazolo[3,2-c][1,2,4]triazole ligand, for which the elusive 3H-tautomer has an energy only 1.4 kcal mol-1 greater than the most stable 2H form, we show that metal complexation is a successful and reliable way for stabilizing the elusive tautomer. We have prepared two complexes of the neutral ligand with CuBr2 and ZnBr2, namely, aquabromidobis[4-methyl-7-(pyrazin-2-yl)-3H-[1,2,4]triazolo[3,2-c][1,2,4]triazole]copper(II) bromide trihydrate, [CuBr(C8H7N7)2(H2O)]Br·3H2O, and dibromido[4-methyl-7-(pyrazin-2-yl)-2H-[1,2,4]triazolo[3,2-c][1,2,4]triazole][4-methyl-7-(pyrazin-2-yl)-3H-[1,2,4]triazolo[3,2-c][1,2,4]triazole]zinc(II) monohydrate, [ZnBr2(C8H7N7)2]·H2O. The X-ray analysis shows that, in both cases, the elusive 3H-tautomer is present. The results of the crystallographic analysis of the two complexes reflect the different coordination preferences of CuII and ZnII. The copper(II) complex is homotautomeric as it only contains the elusive 3H-tautomer of the ligand. The complex can be described as octahedral with tetragonal distortion. Two 3H-triazolotriazole ligands are bis-chelated in the equatorial plane, while a water molecule and a bromide ion in elongated axial positions complete the coordination environment. The zinc(II) complex, on the other hand, is heterotautomeric and contains two bromide ions and two monodentate ligand molecules, one in the 2H-tautomeric form and the other in the 3H-tautomeric form, both coordinated to the metal in tetrahedral geometry. The observation of mixed-tautomer complexes is unprecedented for neutral ligands. The analysis of the X-ray molecular structures of the two complexes allows the deduction of possible rules for a rational design of mixed-tautomer complexes.
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Affiliation(s)
- Emmanuele Parisi
- Dipartimento di Scienze Chimiche, Università degli Studi di Napoli 'Federico II', Complesso di Monte S. Angelo, Via Cinthia, 80126 Napoli, Italy
| | - Roberto Centore
- Dipartimento di Scienze Chimiche, Università degli Studi di Napoli 'Federico II', Complesso di Monte S. Angelo, Via Cinthia, 80126 Napoli, Italy
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Parisi E, Capasso D, Capobianco A, Peluso A, Di Gaetano S, Fusco S, Manfredi C, Mozzillo R, Pinto G, Centore R. Tautomeric and conformational switching in a new versatile N-rich heterocyclic ligand. Dalton Trans 2020; 49:14452-14462. [PMID: 33043951 DOI: 10.1039/d0dt02572k] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new N-rich triazolo-triazole derivative, 4-methyl-7-(pyrazin-2-yl)-2H-[1,2,4]triazolo[3,2-c][1,2,4]triazole (C8H7N7), bearing a pyrazine residue at 7-position of the triazolo-triazole bicycle, was synthesized, and its acid-base and metal coordination properties were evaluated in solution. The results showed amphoteric behavior and the formation of stable complexes with Cu(ii) and Zn(ii) in pH intervals in which the ligand is neutral or deprotonated. Computational studies were performed in order to evaluate the stability of the different tautomers/conformers of the ligand, and the proton position in the neutral and acidic forms. Single crystal X-ray analysis of the free neutral ligand (2H/s-trans tautomer/conformer), and of its singly protonated (2H-3H/s-trans), doubly protonated (2H-3H-7H/s-trans) and deprotonated forms showed that the influence of the pyrazine ring on the triazolo-triazole system is mainly as electron withdrawing and chelating group, and proton acceptor. Different coordination modes have been evidenced for the neutral and deprotonated ligand. Upon metal coordination, the neutral ligand switches from 2H/s-trans to 3H/s-cis tautomer/conformer forming five-membered chelate rings, while the anionic deprotonated ligand forms six-membered chelate rings in the s-trans conformation. Altogether, five different tautomers/conformers of the ligand were isolated and characterized. In vitro tests confirmed the general antiproliferative activity of triazolo-triazole compounds and the importance of substitution in position 7 for their selectivity.
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Affiliation(s)
- Emmanuele Parisi
- Department of Chemical Sciences, University of Naples Federico II, Via Cintia, I-80126 Naples, Italy.
| | - Domenica Capasso
- CESTEV, University of Naples Federico II, Via De Amicis 95, 80145 Naples, Italy
| | - Amedeo Capobianco
- Department of Chemistry and Biology, University of Salerno, Via Giovanni Paolo II, 132, I-84084 Fisciano, Salerno, Italy
| | - Andrea Peluso
- Department of Chemistry and Biology, University of Salerno, Via Giovanni Paolo II, 132, I-84084 Fisciano, Salerno, Italy
| | - Sonia Di Gaetano
- CNR-Institute of Biostructures and Bioimaging, Via Mezzocannone 16, 80134 Naples, Italy
| | - Sandra Fusco
- Department of Chemical Sciences, University of Naples Federico II, Via Cintia, I-80126 Naples, Italy.
| | - Carla Manfredi
- Department of Chemical Sciences, University of Naples Federico II, Via Cintia, I-80126 Naples, Italy.
| | - Rosaria Mozzillo
- Department of Chemical Sciences, University of Naples Federico II, Via Cintia, I-80126 Naples, Italy.
| | - Gabriella Pinto
- Department of Chemical Sciences, University of Naples Federico II, Via Cintia, I-80126 Naples, Italy.
| | - Roberto Centore
- Department of Chemical Sciences, University of Naples Federico II, Via Cintia, I-80126 Naples, Italy.
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Fusco S, Parisi E, Volino S, Manfredi C, Centore R. Redox and Emission Properties of Triazolo-Triazole Derivatives and Copper(II) Complexes. J SOLUTION CHEM 2020. [DOI: 10.1007/s10953-020-00975-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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5
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Capobianco A, Di Donato M, Caruso T, Centore R, Lapini A, Manfredi C, Velardo A, Volino S, Peluso A. Phototautomerism of triazolo-triazole scaffold. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2019.127368] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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6
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Fusco S, Capasso D, Centore R, Di Gaetano S, Parisi E. A new biologically active molecular scaffold: crystal structure of 7-(3-hydroxyphenyl)-4-methyl-2H-[1,2,4]triazolo[3,2-c][1,2,4]triazole and selective antiproliferative activity of three isomeric triazolo–triazoles. ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY 2019; 75:1398-1404. [DOI: 10.1107/s2053229619012403] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Accepted: 09/05/2019] [Indexed: 11/11/2022]
Abstract
A study of three isomeric compounds containing a phenolic moiety attached to the nitrogen-rich triazolo–triazole bicycle is presented. In the three isomers, the phenolic OH group is in the ortho, meta and para positions. The crystal structure analysis of the meta isomer (C10H9N5O) shows that the 2H-tautomer is present in the crystal and that the molecule adopts a substantially planar geometry. However, the conformation found in the crystal is different compared to the monoprotonated cation of the same compound previously investigated in several salts. The packing of the meta isomer is driven by the formation of strong hydrogen bonds and shows the formation of infinite planar ribbons, parallel to a, formed around 21 crystallographic axes. The three isomers were tested against some cancer cell lines and also against normal cell lines. The ortho isomer shows a weak antiproliferative activity, the meta isomer shows significant antiproliferative activity against some cancer lines and no activity against healthy cell lines, and the para isomer is active against all the tested cell lines.
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Piccialli V, Tuzi A, Centore R. Crystal structure of an ep-oxy-sterol: 9α,11α-ep-oxy-5α-cholest-7-ene-3β,5,6α-triol 3,6-di-acetate. Acta Crystallogr E Crystallogr Commun 2017; 73:1603-1606. [PMID: 29152333 PMCID: PMC5683473 DOI: 10.1107/s2056989017013391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2017] [Accepted: 09/19/2017] [Indexed: 11/16/2022]
Abstract
The title compound, C31H48O6, is a polyoxygenated ep-oxy steroid obtained by a multi-step synthesis involving oxidation of 7-de-hydro-cholesterol. It crystallizes in the P212121 space group; however, the absolute structure of the molecule in the crystal could not be determined by resonant scattering. The configuration at the C5 and C6 positions is in both cases of the α-type, as is that of the C atoms of the ep-oxy ring. Mol-ecules in the crystal form chains parallel to the b axis by hydrogen bonding between O-H donors and carbonyl O-atom acceptors. Some atoms of the alkyl chain are disordered over two orientations, with a refined occupancy ratio of 0.511 (10):0.489 (10).
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Affiliation(s)
- Vincenzo Piccialli
- Dipartimento di Scienze Chimiche, Università degli Studi di Napoli ’Federico II’, Complesso di Monte S. Angelo, Via Cinthia, 80126 Napoli, Italy
| | - Angela Tuzi
- Dipartimento di Scienze Chimiche, Università degli Studi di Napoli ’Federico II’, Complesso di Monte S. Angelo, Via Cinthia, 80126 Napoli, Italy
| | - Roberto Centore
- Dipartimento di Scienze Chimiche, Università degli Studi di Napoli ’Federico II’, Complesso di Monte S. Angelo, Via Cinthia, 80126 Napoli, Italy
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8
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Piccialli V, Tuzi A, Centore R. Pseudosymmetry and high Z' structures: the case of rac-(2 R,2' R,5' S)-2-methyl-5'-[(1 R,2 R,5 S,5' S)-1,4,4,5'-tetra-methyl-dihydro-3' H-3,8-dioxa-spiro-[bi-cyclo-[3.2.1]octane-2,2'-furan]-5'-yl]-3,4,1',2',3',4'-hexa-hydro-[2,2'-bi-furan]-5(2 H)-one. Acta Crystallogr E Crystallogr Commun 2017; 73:1282-1286. [PMID: 28932455 PMCID: PMC5588561 DOI: 10.1107/s2056989017010805] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Accepted: 07/21/2017] [Indexed: 11/26/2022]
Abstract
The title compound, C22H34O6, is one of the products obtained by oxidation of squalene with the catalytic system RuO4(cat.)/NaIO4. It crystallizes in the P-1 space group, with four crystallographically independent mol-ecules related by a pseudo-C2 symmetry axis. The structural analysis also shows that the title compound is isomeric with two products previously reported in the literature and that are obtained by the same reaction procedure. In particular, out of the seven chiral C atoms present in the mol-ecule, the title compound shows the opposite configuration at, respectively, four and two chiral centres with respect to the isomeric compounds.
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Affiliation(s)
- Vincenzo Piccialli
- Dipartimento di Scienze Chimiche, Università degli Studi di Napoli ’Federico II’, Complesso di Monte S. Angelo, Via Cinthia, 80126 Napoli, Italy
| | - Angela Tuzi
- Dipartimento di Scienze Chimiche, Università degli Studi di Napoli ’Federico II’, Complesso di Monte S. Angelo, Via Cinthia, 80126 Napoli, Italy
| | - Roberto Centore
- Dipartimento di Scienze Chimiche, Università degli Studi di Napoli ’Federico II’, Complesso di Monte S. Angelo, Via Cinthia, 80126 Napoli, Italy
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9
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Centore R, Manfredi C, Capobianco A, Volino S, Ferrara MV, Carella A, Fusco S, Peluso A. Solid State Separation and Isolation of Tautomers of Fused-Ring Triazolotriazoles. J Org Chem 2017; 82:5155-5161. [PMID: 28452478 DOI: 10.1021/acs.joc.7b00380] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Fine control of the tautomeric forms of [1,2,4]triazolo[3,2-c][1,2,4]triazole derivatives in acidic conditions has been achieved by acting on the electronic character of the substituent at position 7 of the heterobicycle and on the counterion. Strong electron releasing or electron withdrawing substituents lead almost exclusively to a single tautomeric form, the 1H-3H or the 2H-3H, respectively. In the case of the phenol substituent, both tautomeric forms are present in comparable amount in solution; the two tautomers can also be selectively precipitated in different crystalline salts using suitable counterions.
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Affiliation(s)
- Roberto Centore
- Department of Chemical Sciences, University of Naples Federico II , Via Cintia, I-80126 Naples, Italy
| | - Carla Manfredi
- Department of Chemical Sciences, University of Naples Federico II , Via Cintia, I-80126 Naples, Italy
| | - Amedeo Capobianco
- Department of Chemistry and Biology, University of Salerno , Via Giovanni Paolo II, 132, I-84084 Fisciano, Salerno, Italy
| | - Sabato Volino
- Department of Chemical Sciences, University of Naples Federico II , Via Cintia, I-80126 Naples, Italy
| | - Maria Vittoria Ferrara
- Department of Chemical Sciences, University of Naples Federico II , Via Cintia, I-80126 Naples, Italy
| | - Antonio Carella
- Department of Chemical Sciences, University of Naples Federico II , Via Cintia, I-80126 Naples, Italy
| | - Sandra Fusco
- Department of Chemical Sciences, University of Naples Federico II , Via Cintia, I-80126 Naples, Italy
| | - Andrea Peluso
- Department of Chemistry and Biology, University of Salerno , Via Giovanni Paolo II, 132, I-84084 Fisciano, Salerno, Italy
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10
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Piccialli V, Tuzi A, Centore R. Crystal structure of a new spiro-polytetra-hydro-furan compound with translational pseudosymmetry: rac-(2 S,2' S,5' R)-2-methyl-5'-[(1 R,2 R,5 S,5' R)-1,4,4,5'-tetra-methyl-dihydro-3' H-3,8-dioxa-spiro[bi-cyclo-[3.2.1]octane-2,2'-furan]-5'-yl]hexa-hydro[2,2'-bi-furan]-5(2 H)-one. Acta Crystallogr E Crystallogr Commun 2017; 73:780-784. [PMID: 28529798 PMCID: PMC5418806 DOI: 10.1107/s2056989017006065] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Accepted: 04/21/2017] [Indexed: 11/16/2022]
Abstract
The title compound, C22H34O6, is a product of oxidation of squalene with the catalytic system RuO4(cat.)/NaIO4. The asymmetric unit contains two crystallographically independent mol-ecules of very similar geometry approximately related by the non-crystallographic translation vector c/2. As a consequence, the average diffracted intensity in the hkl layers with odd l is systematically lower than in the layers with even l. In one mol-ecule, the lactone ring and part of the adjacent tetra-hydro-furan ring are disordered over two orientations with refined occupancy ratio of 0.831 (10):0.169 (10). The crystal structure is mainly governed by van der Waals forces.
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Affiliation(s)
- Vincenzo Piccialli
- Dipartimento di Scienze Chimiche, Università degli Studi di Napoli ‘Federico II’, Complesso di Monte S. Angelo, Via Cinthia, 80126 Napoli, Italy
| | - Angela Tuzi
- Dipartimento di Scienze Chimiche, Università degli Studi di Napoli ‘Federico II’, Complesso di Monte S. Angelo, Via Cinthia, 80126 Napoli, Italy
| | - Roberto Centore
- Dipartimento di Scienze Chimiche, Università degli Studi di Napoli ‘Federico II’, Complesso di Monte S. Angelo, Via Cinthia, 80126 Napoli, Italy
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11
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Piccialli V, Borbone N, Oliviero G, Piccialli G, D’Errico S, Centore R. 5-Amino-1-(2',3'- O-iso-propyl-idene-d-ribit-yl)-1 H-imidazole-4-carboxamide: a crystal structure with Z' = 4. Acta Crystallogr E Crystallogr Commun 2017; 73:183-187. [PMID: 28217338 PMCID: PMC5290561 DOI: 10.1107/s2056989017000500] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2017] [Accepted: 01/10/2017] [Indexed: 11/10/2022]
Abstract
The title compound, C12H20N4O5, crystallizes in the monoclinic space group P21, with four crystallographically independent mol-ecules in the asymmetric unit. The four mol-ecules have a very similar conformation that is basically determined by the formation of two intra-molecular hydrogen bonds between the amino NH2 donors and the carbonyl and ring O-atom acceptors, forming, respectively, R(6) and R(7) ring motifs.. In the crystal, inter-molecular hydrogen bonding leads to the formation of R22(10) ring patterns, involving one amide CONH2 donor and an imidazole N-atom acceptor. The cluster of the four independent mol-ecules has approximate non-crystallographic C2 point symmetry. The structural analysis also shows that during the synthesis of the title compound, the reductive cleavage of the d-ribose ring of the inosine precursor proceeds stereoselectively, with retention of configuration.
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Affiliation(s)
- Vincenzo Piccialli
- Dipartimento di Scienze Chimiche, Università degli Studi di Napoli ‘Federico II’, Complesso di Monte S. Angelo, Via Cinthia, 80126 Napoli, Italy
| | - Nicola Borbone
- Dipartimento di Farmacia, Università degli Studi di Napoli ‘Federico II’, Via D. Montesano 49, 80131 Napoli, Italy
| | - Giorgia Oliviero
- Dipartimento di Farmacia, Università degli Studi di Napoli ‘Federico II’, Via D. Montesano 49, 80131 Napoli, Italy
| | - Gennaro Piccialli
- Dipartimento di Farmacia, Università degli Studi di Napoli ‘Federico II’, Via D. Montesano 49, 80131 Napoli, Italy
| | - Stefano D’Errico
- Dipartimento di Farmacia, Università degli Studi di Napoli ‘Federico II’, Via D. Montesano 49, 80131 Napoli, Italy
| | - Roberto Centore
- Dipartimento di Scienze Chimiche, Università degli Studi di Napoli ‘Federico II’, Complesso di Monte S. Angelo, Via Cinthia, 80126 Napoli, Italy
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12
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13
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Fusco S, Maglione C, Velardo A, Piccialli V, Liguori R, Peluso A, Rubino A, Centore R. N-Rich Fused Heterocyclic Systems: Synthesis, Structure, Optical and Electrochemical Characterization. European J Org Chem 2016. [DOI: 10.1002/ejoc.201501283] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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14
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Guo W, Zhang T, Zhang B, Feng Y, Chen S, Mi Z. Studies on sodium polymers based on di(1H-tetrazol-5-yl)methanone oxime. RSC Adv 2016. [DOI: 10.1039/c6ra15591j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
[Na(Hbto)(H2O)2·2H2O]n (1), [(NH3OH)2Na2(bto)2(H2O)4·H2O]n (2) and [(NH3OH)Na(bto)(H2O)2]n (3), eco-friendly coordination polymers, have been synthesized.
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Affiliation(s)
- Weiming Guo
- State Key Laboratory of Explosion Science and Technology
- Beijing Institute of Technology
- Beijing 100081
- China
| | - Tonglai Zhang
- State Key Laboratory of Explosion Science and Technology
- Beijing Institute of Technology
- Beijing 100081
- China
| | - Bo Zhang
- State Key Laboratory of Explosion Science and Technology
- Beijing Institute of Technology
- Beijing 100081
- China
| | - Yongan Feng
- State Key Laboratory of Explosion Science and Technology
- Beijing Institute of Technology
- Beijing 100081
- China
| | - Sitong Chen
- State Key Laboratory of Explosion Science and Technology
- Beijing Institute of Technology
- Beijing 100081
- China
| | - Zhenhao Mi
- State Key Laboratory of Explosion Science and Technology
- Beijing Institute of Technology
- Beijing 100081
- China
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15
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Centore R, Manfredi C, Fusco S, Maglione C, Carella A, Capobianco A, Peluso A, Colonna D, Di Carlo A. Proton induced tautomeric switching in N-rich aromatics with tunable acid-base character. J Mol Struct 2015. [DOI: 10.1016/j.molstruc.2015.03.030] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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16
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Klapötke TM, Schmid PC, Schnell S, Stierstorfer J. 3,6,7-Triamino-[1,2,4]triazolo[4,3-b][1,2,4]triazole: A Non-toxic, High-Performance Energetic Building Block with Excellent Stability. Chemistry 2015; 21:9219-28. [DOI: 10.1002/chem.201500982] [Citation(s) in RCA: 94] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Indexed: 11/05/2022]
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17
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Li F, Bi Y, Zhao W, Zhang T, Zhou Z, Yang L. Nitrogen-Rich Salts Based on the Energetic [Monoaquabis(N,N-bis(1H-tetrazol-5-yl)amine)-zinc(II)] Anion: A Promising Design in the Development of New Energetic Materials. Inorg Chem 2015; 54:2050-7. [DOI: 10.1021/ic503021c] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Fugang Li
- State Key Laboratory of Explosion Science
and Technology, Beijing Institute of Technology, No. 5, South Street Zhongguancun, Beijing 100081, China
| | - Yangang Bi
- State Key Laboratory of Explosion Science
and Technology, Beijing Institute of Technology, No. 5, South Street Zhongguancun, Beijing 100081, China
| | - Wenyuan Zhao
- State Key Laboratory of Explosion Science
and Technology, Beijing Institute of Technology, No. 5, South Street Zhongguancun, Beijing 100081, China
| | - Tonglai Zhang
- State Key Laboratory of Explosion Science
and Technology, Beijing Institute of Technology, No. 5, South Street Zhongguancun, Beijing 100081, China
| | - Zunning Zhou
- State Key Laboratory of Explosion Science
and Technology, Beijing Institute of Technology, No. 5, South Street Zhongguancun, Beijing 100081, China
| | - Li Yang
- State Key Laboratory of Explosion Science
and Technology, Beijing Institute of Technology, No. 5, South Street Zhongguancun, Beijing 100081, China
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Kadam SS, Maier L, Kostakis I, Pouli N, Toušek J, Nečas M, Marakos P, Marek R. Synthesis and Tautomerism of Substituted Pyrazolo[4,3-c]pyrazoles. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300606] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Centore R, Piccialli V. 4,5-Diamino-3-[( E, E)-4-(4,5-diamino-4 H-1,2,4-triazol-3-yl)buta-1,3-dienyl]-4 H-1,2,4-triazol-1-ium chloride. Acta Crystallogr Sect E Struct Rep Online 2013; 69:o1131-2. [PMID: 24046684 PMCID: PMC3770399 DOI: 10.1107/s1600536813016589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2013] [Accepted: 06/14/2013] [Indexed: 11/13/2022]
Abstract
The title compound, C8H13N10+·Cl−, is the monochlorhydrate salt of an aromatic bis(diaminotriazole). The cation is centrosymmetric, lying about an inversion centre (Ci symmetry) because the acidic H atom is disordered over two centrosymmetrically related ring N atoms, with equal multiplicity. It is noteworthy that protonation occurs at an N atom of the ring, instead of at the C—NH2 or N—NH2 amino groups. The chloride anions are also in special positions, as they lie on binary axes, and so the crystallographically independent unit contains half of a formula unit. The N atom of the C—NH2 group is sp2-hybridized and the amino group is coplanar with the triazole ring [dihedral angle = 5 (3)°], while the N atom of the N—NH2 amino group is pyramidal. The C=C bonds are in E conformations and the cation is flat because the conformation of the carbon chain is fully extended. The chloride anions are hexacoordinated, in a distorted trigonal–prismatic geometry, and they are involved, as acceptors, in six hydrogen bonds. Chains of hydrogen-bonded cations, running along c and a + c, are generated by c-glide and C2 rotation, respectively. This combination of N—H⋯Cl and N—H⋯N hydrogen bonds leads to the formation of a three-dimensional network.
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Centore R, Piccialli V, Tuzi A. 2-(4-Methyl-phen-yl)-6-nitro-1,3-benzoxazole. Acta Crystallogr Sect E Struct Rep Online 2013; 69:o667-8. [PMID: 23723829 PMCID: PMC3647863 DOI: 10.1107/s1600536813008970] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2013] [Accepted: 04/02/2013] [Indexed: 11/10/2022]
Abstract
The title compound, C14H10N2O3, is a π-conjugated mol-ecule containing a benzoxazole aromatic fused heterobicycle. The benzoxazole ring system is planar within 0.01 Å. The mol-ecule assumes an approximately flat conformation, the benzoxazole ring system forming dihedral angles of 6.52 (12) and 7.4 (3)° with the benzene ring and the nitro group, respectively. In the crystal, mol-ecules are connected by very weak C-H⋯O hydrogen inter-actions, forming chains running parallel to the a or c axes. The methyl H atoms are disordered over two sets of sites of equal occupancy rotated by 60°.
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Affiliation(s)
- Roberto Centore
- Dipartimento di Scienze Chimiche, Università degli Studi di Napoli 'Federico II', Complesso di Monte S. Angelo, Via Cinthia, 80126 Napoli, Italy
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