151
|
Wang X, Xiong Y, Liu G, Lin H, Wang X. Polycarboxylate-directed semi-rigid pyridyl-amide-based various NiII complexes: electrochemical properties and enhancements of photocatalytic activities by calcination. Dalton Trans 2018; 47:9903-9911. [PMID: 29998239 DOI: 10.1039/c8dt00836a] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Four different pyridyl-amide-based Ni-complexes were synthesized by tuning polycarboxylates, displaying bifunctional electrocatalytic properties and enhancements of photocatalytic activities by calcination.
Collapse
Affiliation(s)
- Xiuli Wang
- Department of Chemistry
- Bohai University
- Jinzhou
- P. R. China
| | - Ying Xiong
- Department of Chemistry
- Bohai University
- Jinzhou
- P. R. China
| | - Guocheng Liu
- Department of Chemistry
- Bohai University
- Jinzhou
- P. R. China
| | - Hongyan Lin
- Department of Chemistry
- Bohai University
- Jinzhou
- P. R. China
| | - Xiang Wang
- Department of Chemistry
- Bohai University
- Jinzhou
- P. R. China
| |
Collapse
|
152
|
Perpétuo GJ, Janczak J. Solid-state supramolecular architectures formed by co-crystallization of melamine and 2-, 3- and 4-fluorophenylacetic acids. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2017.09.099] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
153
|
Abstract
Six different crystal structures are obtained depending on the crystallization solvent.
Collapse
Affiliation(s)
- Sarah J. Pike
- Department of Chemistry
- University of Cambridge
- Cambridge
- UK
| | - Andrew D. Bond
- Department of Chemistry
- University of Cambridge
- Cambridge
- UK
| | | |
Collapse
|
154
|
Saha S, Desiraju GR. Trimorphs of 4-bromophenyl 4-bromobenzoate. Elastic, brittle, plastic. Chem Commun (Camb) 2018; 54:6348-6351. [DOI: 10.1039/c8cc02662a] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Trimorphs of 4-bromophenyl 4-bromobenzoate exhibit distinctly different mechanical properties, brittle, plastic, and elastic. Intermodular interactions and crystal packing are discussed in this context.
Collapse
Affiliation(s)
- Subhankar Saha
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India
| | - Gautam R. Desiraju
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India
| |
Collapse
|
155
|
Ainurofiq A, Mauludin R, Mudhakir D, Umeda D, Soewandhi SN, Putra OD, Yonemochi E. Improving mechanical properties of desloratadine via multicomponent crystal formation. Eur J Pharm Sci 2018; 111:65-72. [DOI: 10.1016/j.ejps.2017.09.035] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2017] [Revised: 09/19/2017] [Accepted: 09/24/2017] [Indexed: 11/30/2022]
|
156
|
|
157
|
Saneei A, Pourayoubi M, Jasinski JP, Jenny TA, Crochet A, Fromm KM, Keeley AC. The synergistic cooperation of NH⋯O and CH⋯O hydrogen bonds in the structures of three new phosphoric triamides. PHOSPHORUS SULFUR 2017. [DOI: 10.1080/10426507.2017.1399128] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Anahid Saneei
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Mehrdad Pourayoubi
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
| | | | - Titus A. Jenny
- Department of Chemistry, University of Fribourg, Rte du Musée 9, Fribourg, Switzerland
| | - Aurelien Crochet
- Fribourg Centre for Nanomaterial's, FriMat, University of Fribourg, Chemin du Musée 3, Fribourg, Switzerland
| | - Katharina M. Fromm
- Fribourg Centre for Nanomaterial's, FriMat, University of Fribourg, Chemin du Musée 3, Fribourg, Switzerland
| | | |
Collapse
|
158
|
Etaiw SEH, Abd El-Aziz DM, Abdou SN. Single Crystal of New Nanostructure Self-Assembled Copper–Cyanide and Hexamethylenetetramine as an Efficient Supramolecular Coordination Polymer Catalyst. J Inorg Organomet Polym Mater 2017. [DOI: 10.1007/s10904-017-0749-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
159
|
Dey D, Chopra D. Quantitative analysis of solid-state diversity in trifluoromethylated phenylhydrazones. ACTA CRYSTALLOGRAPHICA SECTION B, STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS 2017; 73:781-793. [PMID: 28980982 DOI: 10.1107/s2052520617006643] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2017] [Accepted: 05/03/2017] [Indexed: 06/07/2023]
Abstract
The cooperative roles of various structural motifs associated with the presence of different intermolecular interactions in the formation of molecular crystals are investigated in a series of trifluoromethylated phenylhydrazones. Out of the six compounds analysed, two exhibit three-dimensional structural similarities with geometrically equivalent building blocks, while a third exists as two polymorphic forms crystallized from ethanol solutions at low temperature (277 K) and room temperature (298 K), respectively. The compounds were characterized via single-crystal and powder X-ray diffraction techniques and differential scanning calorimetry. In the absence of any strong hydrogen bonding, the supramolecular constructs are primarily stabilized via molecular pairs with a high dispersion-energy contribution, due to the presence of molecular stacking along the molecular backbone along with C-H...π interactions in the solid state, in preference to an electrostatic contribution. The interaction energies for the most stabilizing molecular building blocks are in the range -29 to -43 kJ mol-1. In addition, weak N-H...F, C-H...F and N-H...C interactions and F...F, F...C, F...N and C...N contacts act as secondary motifs, providing additional stability to the crystal packing. The overall molecular arrangements are carefully analysed in terms of their nature and energetics, and the roles of different molecular pairs towards the crystal structure are delineated. A topological study using the quantum theory of atoms in molecules was used to characterize all the atomic interactions in the solid state. It established the presence of (3, -1) bond critical points and the closed-shell nature of all the interactions.
Collapse
Affiliation(s)
- Dhananjay Dey
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhouri, Bhopal-By-Pass Road, Bhopal, Madhya Pradesh 462 066, India
| | - Deepak Chopra
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhouri, Bhopal-By-Pass Road, Bhopal, Madhya Pradesh 462 066, India
| |
Collapse
|
160
|
Ferreira de Freitas R, Schapira M. A systematic analysis of atomic protein-ligand interactions in the PDB. MEDCHEMCOMM 2017; 8:1970-1981. [PMID: 29308120 PMCID: PMC5708362 DOI: 10.1039/c7md00381a] [Citation(s) in RCA: 262] [Impact Index Per Article: 37.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Accepted: 09/15/2017] [Indexed: 12/20/2022]
Abstract
As the protein databank (PDB) recently passed the cap of 123 456 structures, it stands more than ever as an important resource not only to analyze structural features of specific biological systems, but also to study the prevalence of structural patterns observed in a large body of unrelated structures, that may reflect rules governing protein folding or molecular recognition. Here, we compiled a list of 11 016 unique structures of small-molecule ligands bound to proteins - 6444 of which have experimental binding affinity - representing 750 873 protein-ligand atomic interactions, and analyzed the frequency, geometry and impact of each interaction type. We find that hydrophobic interactions are generally enriched in high-efficiency ligands, but polar interactions are over-represented in fragment inhibitors. While most observations extracted from the PDB will be familiar to seasoned medicinal chemists, less expected findings, such as the high number of C-H···O hydrogen bonds or the relatively frequent amide-π stacking between the backbone amide of proteins and aromatic rings of ligands, uncover underused ligand design strategies.
Collapse
Affiliation(s)
| | - Matthieu Schapira
- Structural Genomics Consortium , University of Toronto , Toronto , ON M5G 1L7 , Canada .
- Department of Pharmacology and Toxicology , University of Toronto , Toronto , ON M5S 1A8 , Canada
| |
Collapse
|
161
|
Neumann T, Germann LS, Moudrakovski I, Dinnebier RE, dos Santos Cunha C, Terraschke H, Näther C. Synthesis, Crystal Structures, and Properties of M
(NCS)2
-3-aminomethylpyridine Coordination Compounds (M
= Cd, Zn). Z Anorg Allg Chem 2017. [DOI: 10.1002/zaac.201700250] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Tristan Neumann
- Institute of Inorganic Chemistry; Christian-Albrechts-University of Kiel; Max-Eyth-Strasse 2 24118 Kiel Germany
| | - Luzia S. Germann
- Max Planck Institute for Solid State Research; Heisenbergstrasse 1 70569 Stuttgart Germany
| | - Igor Moudrakovski
- Max Planck Institute for Solid State Research; Heisenbergstrasse 1 70569 Stuttgart Germany
| | - Robert E. Dinnebier
- Max Planck Institute for Solid State Research; Heisenbergstrasse 1 70569 Stuttgart Germany
| | - Cesar dos Santos Cunha
- Institute of Inorganic Chemistry; Christian-Albrechts-University of Kiel; Max-Eyth-Strasse 2 24118 Kiel Germany
| | - Huayna Terraschke
- Institute of Inorganic Chemistry; Christian-Albrechts-University of Kiel; Max-Eyth-Strasse 2 24118 Kiel Germany
| | - Christian Näther
- Institute of Inorganic Chemistry; Christian-Albrechts-University of Kiel; Max-Eyth-Strasse 2 24118 Kiel Germany
| |
Collapse
|
162
|
Dhibar S, Ghosh D, Dey A, Mondal RK, Dey B. Selective detection of Triton X-100 based organized media by a 1-D coordination polymer of Cu(II) in water: Fluorescence spectroscopic and microstructural investigations. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.06.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
163
|
Chhetri PM, Chang YC, Hu HL, Chiang YH, Yang XK, Chen JD. Role of halogen atoms in the formation of one-dimensional Cu(I) coordination polymers based on 2-amino-5-halopyrimidine. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.05.028] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
164
|
Sun J, Yang M, Sun Z, Wang X, Ma Y, Li L. Unprecedented ferromagnetic Gdnitronyl nitroxide coupling through a hydrogen bonding bridge. Dalton Trans 2017; 46:10189-10192. [PMID: 28726967 DOI: 10.1039/c7dt02232h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel lanthanide(iii)-nitronyl nitroxide chain {[Gd(hfac)3(Nit-Ph-3,5-bIm)(H2O)]·C4H10O}n (1) was prepared and characterized. Strikingly, an unexpected ferromagnetic coupling between the Gd(iii) ion and the nitroxide group mediated by hydrogen bonding has been observed for the first time.
Collapse
Affiliation(s)
- Juan Sun
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry and Tianjin Key Laboratory of Metal and Molecule-based Material Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China.
| | | | | | | | | | | |
Collapse
|
165
|
Robertson CC, Wright JS, Carrington EJ, Perutz RN, Hunter CA, Brammer L. Hydrogen bonding vs. halogen bonding: the solvent decides. Chem Sci 2017; 8:5392-5398. [PMID: 28970918 PMCID: PMC5585772 DOI: 10.1039/c7sc01801k] [Citation(s) in RCA: 130] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2017] [Accepted: 05/17/2017] [Indexed: 12/22/2022] Open
Abstract
Control of intermolecular interactions is integral to harnessing self-assembly in nature. Here we demonstrate that control of the competition between hydrogen bonds and halogen bonds, the two most highly studied directional intermolecular interactions, can be exerted by choice of solvent (polarity) to direct the self-assembly of co-crystals. Competitive co-crystal formation has been investigated for three pairs of hydrogen bond and halogen bond donors, which can compete for a common acceptor group. These competitions have been examined in seven different solvents. Product formation has been determined and phase purity has been examined by analysis of powder X-ray diffraction patterns. Formation of hydrogen-bonded co-crystals is favoured from less polar solvents and halogen-bonded co-crystals from more polar solvents. The solvent polarity at which the crystal formation switches from hydrogen-bond to halogen-bond dominance depends on the relative strengths of the interactions, but is not a function of the solution-phase interactions alone. The results clearly establish that an appreciation of solvent effects is critical to obtain control of the intermolecular interactions.
Collapse
Affiliation(s)
- Craig C Robertson
- Department of Chemistry , University of Sheffield , Brook Hill , Sheffield , S3 7HF , UK .
| | - James S Wright
- Department of Chemistry , University of Sheffield , Brook Hill , Sheffield , S3 7HF , UK .
| | - Elliot J Carrington
- Department of Chemistry , University of Sheffield , Brook Hill , Sheffield , S3 7HF , UK .
| | - Robin N Perutz
- Department of Chemistry , University of York , Heslington , York , YO10 5DD , UK .
| | - Christopher A Hunter
- Department of Chemistry , University of Cambridge , Lensfield Road , Cambridge CB2 1EW , UK .
| | - Lee Brammer
- Department of Chemistry , University of Sheffield , Brook Hill , Sheffield , S3 7HF , UK .
| |
Collapse
|
166
|
Tiekink ER. Supramolecular assembly based on “emerging” intermolecular interactions of particular interest to coordination chemists. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2017.01.009] [Citation(s) in RCA: 104] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
167
|
Şen F, Kansiz S, Uçar İ. A one-dimensional copper(II) coordination polymer incorporating succinate and N,N-diethylethylenediamine ligands: crystallographic analysis, vibrational and surface features, and DFT analysis. ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY 2017; 73:517-524. [PMID: 28677602 DOI: 10.1107/s2053229617008452] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2017] [Accepted: 06/07/2017] [Indexed: 11/11/2022]
Abstract
Transition metal atoms can be bridged by aliphatic dicarboxylate ligands to produce chains, layers and frameworks. The reaction of copper sulfate with succinic acid (H2succ) and N,N-diethylethylenediamine (deed) in basic solution produces the complex catena-poly[[[(N,N-diethylethylenediamine-κ2N,N')copper(II)]-μ-succinato-κ2O1:O4] tetrahydrate], {[Cu(C4H4O4)(C6H16N2)]·4H2O}n or {[Cu(succ)(deed)]·4H2O}n. Each carboxylate group of the succinate ligand coordinates to a CuII atom in a monodentate fashion, giving rise to a square-planar coordination environment. The succinate ligands bridge the CuII centres to form one-dimensional polymeric chains. Hydrogen bonds between the ligands and water molecules link these chains into sheets that lie in the ab plane. Density functional theory (DFT) calculations were used to support the experimental data. From these calculations, a good linear correlation was observed between the experimental and theoretically predicted structural and spectroscopic parameters (R2 ∼ 0.97).
Collapse
Affiliation(s)
- Fatih Şen
- Bozok University, Sorgun Vocational School, Department of Opticianry, Yozgat, Turkey
| | - Sevgi Kansiz
- Department of Physics, Faculty of Arts and Sciences, Ondokuz Mayıs University, Samsun, Turkey
| | - İbrahim Uçar
- Department of Physics, Faculty of Arts and Sciences, Ondokuz Mayıs University, Samsun, Turkey
| |
Collapse
|
168
|
Mondal J, Mukherjee A, Patra GK. CuX (X = I, Br and Cl) based coordination polymers of azino-pyridyl ligand and PPh 3 : Structural, spectral, electro-chemical, and DFT studies. Inorganica Chim Acta 2017. [DOI: 10.1016/j.ica.2017.03.031] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
169
|
Sergeenko AS, Ovens JS, Leznoff DB. Copper(II) Dihalotetracyanoplatinate(IV) Coordination Polymers and Their Vapochromic Behavior. Inorg Chem 2017; 56:7870-7881. [DOI: 10.1021/acs.inorgchem.7b00596] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Ania S. Sergeenko
- Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada
| | - Jeffrey S. Ovens
- Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada
| | - Daniel B. Leznoff
- Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada
| |
Collapse
|
170
|
Brown ML, Ovens JS, Leznoff DB. Dicyanoaurate-based heterobimetallic uranyl coordination polymers. Dalton Trans 2017; 46:7169-7180. [PMID: 28508898 DOI: 10.1039/c7dt00942a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The first series of uranyl ([UO2]2+)-dicyanoaurate coordination polymers and molecular complexes has been synthesized. Reactions of [A][Au(CN)2] (A = [nBu4N]+ or [(Ph3P)2N]+ ([PPN])) and uranyl nitrate in alcoholic solvents in ambient light led to [A]2[(UO2)2(μ-η2:η2-O2)(NO3)2(μ-Au(CN)2)2], which incorporates peroxo ligands into a one-dimensional ladder topology with alternating aurophilic and peroxo rungs. Conducting the reaction with non-alcoholic solvents formed two polymorphs of a one-dimensional chain, [PPN][UO2(NO3)2Au(CN)2], from acetone, and a molecular analogue, [PPN]2[UO2(NO3)2(Au(CN)2)2], from acetonitrile, none of which exhibited aurophilic interactions. The addition of 2,2'-bipyridine to the initial reaction resulted in [UO2(bipy)(MeO)(MeOH)]2[(μ-Au(CN)2)(Au(CN)2)], a one-dimensional structure which propagates via a series of linear aurophilic bonds with pendant uranyl complexes; methanol and methoxy ligands provide additional connections through hydrogen bonding. The addition of 5,5'-dimethyl-2,2'-bipyridine using solvothermal conditions resulted in the one-dimensional ladder [UO2(Me2bipy)Au(CN)2]2[(μ-OH)2], generated through aurophilic bonds and hydroxide ligands. The incorporation of 2,2':6',2''-terpyridine (terpy) using solvothermal conditions resulted in [[UO2(terpy)]2(μ-NO3)(μ-O)][Au(CN)2], a molecular salt with no aurophilic interactions. Emission spectra attributable to aurophilic interactions are observed in [nBu4N]2[(UO2)2(μ-η2:η2-O2)(NO3)2(μ-Au(CN)2)2], while all others only show emission typical of the uranyl cation.
Collapse
Affiliation(s)
- Matthew L Brown
- Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, B.C., Canada.
| | | | | |
Collapse
|
171
|
Croitor L, Coropceanu EB, Duca G, Siminel AV, Fonari MS. Nine Mn(II), Zn(II) and Cd(II) mixed-ligand coordination networks with rigid dicarboxylate and pyridine-n-aldoxime ligands: Impact of the second ligand in the structures’ dimensionality and solvent capacity. Polyhedron 2017. [DOI: 10.1016/j.poly.2017.03.026] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
|
172
|
Chadha K, Karan M, Chadha R, Bhalla Y, Vasisht K. Is Failure of Cocrystallization Actually a Failure? Eutectic Formation in Cocrystal Screening of Hesperetin. J Pharm Sci 2017; 106:2026-2036. [PMID: 28456725 DOI: 10.1016/j.xphs.2017.04.038] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Revised: 03/16/2017] [Accepted: 04/17/2017] [Indexed: 10/19/2022]
Abstract
Cocrystal screening of hesperetin with certain countermolecules generated highly soluble noncovalent derivatives in the form of eutectics, instead of expected cocrystals. As adhesive forces established by complimentary functional groups on hesperetin and coformers were unable to overcome the stress due to size shape mismatch of component molecules, thus, eutectics were formed. Hesperetin, a polyphenolic antioxidant with potent anticancer and cardioprotective effects, has an underdeveloped role in modern therapeutics on account of its critically low aqueous solubility resulting in stunted bioavailability. The liquid-assisted cogrinding of hesperetin and coformers generated binary-phase eutectics in fixed stoichiometry with theophylline (1:1.5), adenine (2:1), gallic acid (1.5:1), and theobromine (2:1). Primarily characterized by lower melting endotherm in differential scanning calorimetry, the eutectics showed complete melting in hot-stage microscopy. Apart from characteristic V-shaped binary-phase diagram, no discernible changes in the FTIR and powder X-ray diffraction spectra further confirm eutectic formation. The morphological differences were analyzed by SEM measurements. A 2 to 4 times enhanced dissolution profile of the eutectics measured in pH 7.4 aqueous buffer was coupled with the in vitro (1,1-diphenyl-2-picryl hydroxyl free radical antioxidant assay and RBC antihemolytic assay) studies to present a complete preliminary data on the improved bioavailability of hesperetin eutectics.
Collapse
Affiliation(s)
- Kunal Chadha
- University Institute of Pharmaceutical Sciences-UGC Centre of Advanced Study, Faculty of Pharmaceutical Sciences, Panjab University, Chandigarh, India
| | - Maninder Karan
- University Institute of Pharmaceutical Sciences-UGC Centre of Advanced Study, Faculty of Pharmaceutical Sciences, Panjab University, Chandigarh, India
| | - Renu Chadha
- University Institute of Pharmaceutical Sciences-UGC Centre of Advanced Study, Faculty of Pharmaceutical Sciences, Panjab University, Chandigarh, India
| | - Yashika Bhalla
- University Institute of Pharmaceutical Sciences-UGC Centre of Advanced Study, Faculty of Pharmaceutical Sciences, Panjab University, Chandigarh, India
| | - Karan Vasisht
- University Institute of Pharmaceutical Sciences-UGC Centre of Advanced Study, Faculty of Pharmaceutical Sciences, Panjab University, Chandigarh, India.
| |
Collapse
|
173
|
Choi E, Ryu M, Lee H, Jung OS. Enantiomeric two-fold interpenetrated 3D zinc(ii) coordination networks as a catalytic platform: significant difference between water within the cage and trace water in transesterification. Dalton Trans 2017; 46:4595-4601. [PMID: 28321444 DOI: 10.1039/c7dt00217c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Self-assembly of Zn(ClO4)2 with 1,1,2,2-tetramethyl-1,2-di(pyridin-3-yl)disilane (L) as a bidentate N-donor gives rise to 3D coordination networks, [Zn(μ-OH)(L)]3(ClO4)3·5H2O (1·5H2O), of unique, 103-a srs net topology. An important feature is that two enantiomeric 3D frameworks, 41- and 43-[Zn(μ-OH)(L)]3(ClO4)3·5H2O, are interpenetrated to form a racemic two-fold 3D network with cages occupied by two water molecules. Another structural characteristic is a C3-symmetric planar Zn3(μ-OH)3 6-membered ring with tetrahedral Zn(ii) ions. The steric hindrance of substrates and trace water effects on transesterification catalysis using the network have been scrutinized. The coordination network acts as a remarkable heterogeneous transesterification catalytic system that shows both the significant steric effects of substrate alcohols and momentous water effects. The substrate activity is in the order ethanol > n-propanol > n-butanol > iso-propanol > 2-butanol > tert-butanol. For the reaction system, solvate water molecules within the cages of the interpenetrated 3D frameworks do not decrease the transesterification activity, whereas the trace water molecules in the substrate alcohols act as obvious obstacles to the reaction.
Collapse
Affiliation(s)
- Eunkyung Choi
- Department of Chemistry, Pusan National University, Pusan 46241, Korea.
| | - Minjoo Ryu
- Department of Chemistry, Pusan National University, Pusan 46241, Korea.
| | - Haeri Lee
- Department of Chemistry, Pusan National University, Pusan 46241, Korea.
| | - Ok-Sang Jung
- Department of Chemistry, Pusan National University, Pusan 46241, Korea.
| |
Collapse
|
174
|
Carletta A, Spinelli F, d'Agostino S, Ventura B, Chierotti MR, Gobetto R, Wouters J, Grepioni F. Halogen-Bond Effects on the Thermo- and Photochromic Behaviour of Anil-Based Molecular Co-crystals. Chemistry 2017; 23:5317-5329. [PMID: 28240437 DOI: 10.1002/chem.201605953] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2016] [Revised: 02/23/2017] [Indexed: 11/11/2022]
Abstract
N-Salicilideneanilines are among the most studied thermo- and photochromic systems in the solid state. Although thermochromism is a general property of crystalline N-salicilideneanilines, photochromism is known in a limited number of cases. As a method for the construction of thermo- and photo-responsive molecular architectures, the co-crystallisation of 1,2,4,5-tetrafluoro-3,6-diiodobenzene (I2F4) with three selected imines of o-vanillin, named 1, 2 and 3, obtained through a condensation reaction with 3-aminopyridine, 4-bromoaniline and 4-iodoaniline, respectively, is reported herein. All crystals and co-crystals have been characterised by means of solid-state complementary techniques (X-ray diffraction, solid-state NMR spectroscopy, absorption and emission spectroscopy). The role of halogen bonding and crystal packing in the optical and chromic properties of all solid materials is discussed. All solids exhibit thermochromic behaviour, and three of them (2, 22 ⋅I2F4 and 32 ⋅I2F4) are also photochromic. Imine derivative 3 crystallises in two different polymorphic forms (3 A and 3 B) and a solvate (3Solv ). The bromo and iodo derivatives, 2 and 3 B, are isomorphous and form isomorphous co-crystals with I2F4, but behave differently when exposed to UV light because only crystalline 2 is photochromic. Interestingly, the replacement of bromine with iodine seems to turn off the photochromism because crystalline 3 A and 3Solv , and even the 20.7 30.3 solid solution, do not manifest photochromic behaviour.
Collapse
Affiliation(s)
- Andrea Carletta
- Department of Chemistry, University of Namur (UNamur), Rue de Bruxelles 61, Namur, 5000, Belgium
| | - Floriana Spinelli
- Università di Bologna, Dipartimento di Chimica G. Ciamician, Via Selmi 2, 40126, Bologna, Italy
| | - Simone d'Agostino
- Università di Bologna, Dipartimento di Chimica G. Ciamician, Via Selmi 2, 40126, Bologna, Italy
| | - Barbara Ventura
- Istituto per la Sintesi Organica e la Fotoreattività (ISOF)-CNR, Via P. Gobetti 101, 40129, Bologna, Italy
| | - Michele R Chierotti
- Dipartimento di Chimica and NIS Centre, Università di Torino, via Giuria 7, 10125, Turin, Italy
| | - Roberto Gobetto
- Dipartimento di Chimica and NIS Centre, Università di Torino, via Giuria 7, 10125, Turin, Italy
| | - Johan Wouters
- Department of Chemistry, University of Namur (UNamur), Rue de Bruxelles 61, Namur, 5000, Belgium
| | - Fabrizia Grepioni
- Università di Bologna, Dipartimento di Chimica G. Ciamician, Via Selmi 2, 40126, Bologna, Italy
| |
Collapse
|
175
|
Syntheses, crystal structures, properties of metal coordination polymers based on a novel semi-rigid aromatic carboxylate ligand. Polyhedron 2017. [DOI: 10.1016/j.poly.2016.12.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
176
|
Zhan C, Cameron JM, Gabb D, Boyd T, Winter RS, Vilà-Nadal L, Mitchell SG, Glatzel S, Breternitz J, Gregory DH, Long DL, Macdonell A, Cronin L. A metamorphic inorganic framework that can be switched between eight single-crystalline states. Nat Commun 2017; 8:14185. [PMID: 28194009 PMCID: PMC5316803 DOI: 10.1038/ncomms14185] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Accepted: 12/07/2016] [Indexed: 02/04/2023] Open
Abstract
The design of highly flexible framework materials requires organic linkers, whereas inorganic materials are more robust but inflexible. Here, by using linkable inorganic rings made up of tungsten oxide (P8W48O184) building blocks, we synthesized an inorganic single crystal material that can undergo at least eight different crystal-to-crystal transformations, with gigantic crystal volume contraction and expansion changes ranging from -2,170 to +1,720 Å3 with no reduction in crystallinity. Not only does this material undergo the largest single crystal-to-single crystal volume transformation thus far reported (to the best of our knowledge), the system also shows conformational flexibility while maintaining robustness over several cycles in the reversible uptake and release of guest molecules switching the crystal between different metamorphic states. This material combines the robustness of inorganic materials with the flexibility of organic frameworks, thereby challenging the notion that flexible materials with robustness are mutually exclusive.
Collapse
Affiliation(s)
- Caihong Zhan
- WestCHEM, School of Chemistry, University of Glasgow, University Avenue, Glasgow G12 8QQ, U.K
| | - Jamie M Cameron
- WestCHEM, School of Chemistry, University of Glasgow, University Avenue, Glasgow G12 8QQ, U.K
| | - David Gabb
- WestCHEM, School of Chemistry, University of Glasgow, University Avenue, Glasgow G12 8QQ, U.K
| | - Thomas Boyd
- WestCHEM, School of Chemistry, University of Glasgow, University Avenue, Glasgow G12 8QQ, U.K
| | - Ross S Winter
- WestCHEM, School of Chemistry, University of Glasgow, University Avenue, Glasgow G12 8QQ, U.K
| | - Laia Vilà-Nadal
- WestCHEM, School of Chemistry, University of Glasgow, University Avenue, Glasgow G12 8QQ, U.K
| | - Scott G Mitchell
- WestCHEM, School of Chemistry, University of Glasgow, University Avenue, Glasgow G12 8QQ, U.K
| | - Stefan Glatzel
- WestCHEM, School of Chemistry, University of Glasgow, University Avenue, Glasgow G12 8QQ, U.K
| | - Joachim Breternitz
- WestCHEM, School of Chemistry, University of Glasgow, University Avenue, Glasgow G12 8QQ, U.K
| | - Duncan H Gregory
- WestCHEM, School of Chemistry, University of Glasgow, University Avenue, Glasgow G12 8QQ, U.K
| | - De-Liang Long
- WestCHEM, School of Chemistry, University of Glasgow, University Avenue, Glasgow G12 8QQ, U.K
| | - Andrew Macdonell
- WestCHEM, School of Chemistry, University of Glasgow, University Avenue, Glasgow G12 8QQ, U.K
| | - Leroy Cronin
- WestCHEM, School of Chemistry, University of Glasgow, University Avenue, Glasgow G12 8QQ, U.K
| |
Collapse
|
177
|
Xu ZX, Ma YL, Liu Y, Zhao HJ. Two Pairs of Homochiral Coordination Polymers with Helices Based on Semi-rigid Lactic Acid Ligands. Z Anorg Allg Chem 2017. [DOI: 10.1002/zaac.201600433] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Zhong-Xuan Xu
- Department of Chemistry; Zunyi Normal College; 563002 Zunyi Guizhou P. R. China
| | - Yu-Lu Ma
- School of Chemical Science and Technology; Yunnan University; 650091 Kunming P. R. China
| | - Yang Liu
- Department of Chemistry; Zunyi Normal College; 563002 Zunyi Guizhou P. R. China
| | - Hua-Jun Zhao
- Department of Chemistry; Zunyi Normal College; 563002 Zunyi Guizhou P. R. China
| |
Collapse
|
178
|
Singaraju AB, Nguyen K, Swenson DC, Iyer M, Haware RV, Stevens LL. Reorganized, weak C–H⋯O interactions directly modify the mechanical properties and compaction performance of a series of nitrobenzoic acids. CrystEngComm 2017. [DOI: 10.1039/c7ce00238f] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
179
|
Azhdari Tehrani A, Ghasempour H, Morsali A, Bauzá A, Frontera A, Retailleau P. Unraveling the dual character of sulfur atoms in a series of Hg(ii) coordination polymers containing bis(4-pyridyl)disulfide. CrystEngComm 2017. [DOI: 10.1039/c7ce00033b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
180
|
Montis R, Arca M, Aragoni MC, Bauzá A, Demartin F, Frontera A, Isaia F, Lippolis V. Hydrogen- and halogen-bond cooperativity in determining the crystal packing of dihalogen charge-transfer adducts: a study case from heterocyclic pentatomic chalcogenone donors. CrystEngComm 2017. [DOI: 10.1039/c7ce01035d] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A synergic cooperation between HB and XB interactions determines the supramolecular architectures in dihalogen CT adducts of hydantoin-like chalcogen donors.
Collapse
Affiliation(s)
- Riccardo Montis
- Dipartimento di Scienze Chimiche e Geologiche
- Università degli Studi di Cagliari
- 09042 Monserrato (CA)
- Italy
| | - Massimiliano Arca
- Dipartimento di Scienze Chimiche e Geologiche
- Università degli Studi di Cagliari
- 09042 Monserrato (CA)
- Italy
| | - M. Carla Aragoni
- Dipartimento di Scienze Chimiche e Geologiche
- Università degli Studi di Cagliari
- 09042 Monserrato (CA)
- Italy
| | - Antonio Bauzá
- Departament de Quimica
- Universitat de les Illes Balears
- Palma de Mallorca (Baleares)
- Spain
| | - Francesco Demartin
- Dipartimento di Chimica
- Università degli Studi di Milano
- 20133 Milano
- Italy
| | - Antonio Frontera
- Departament de Quimica
- Universitat de les Illes Balears
- Palma de Mallorca (Baleares)
- Spain
| | - Francesco Isaia
- Dipartimento di Scienze Chimiche e Geologiche
- Università degli Studi di Cagliari
- 09042 Monserrato (CA)
- Italy
| | - Vito Lippolis
- Dipartimento di Scienze Chimiche e Geologiche
- Università degli Studi di Cagliari
- 09042 Monserrato (CA)
- Italy
| |
Collapse
|
181
|
Kwiatkowski A, Grela I, Ośmiałowski B. Conformational change in the association of a heterocyclic urea derivative forming two intramolecular hydrogen bonds in polar solvent. NEW J CHEM 2017. [DOI: 10.1039/c6nj03224a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Competition of two urea moieties for the same counterpart including change of conformation upon binding in polar solvent.
Collapse
Affiliation(s)
- Adam Kwiatkowski
- Faculty of Chemical Technology and Engineering
- UTP University of Science and Technology
- PL-85326 Bydgoszcz
- Poland
| | - Izabela Grela
- Faculty of Chemical Technology and Engineering
- UTP University of Science and Technology
- PL-85326 Bydgoszcz
- Poland
| | - Borys Ośmiałowski
- Faculty of Chemical Technology and Engineering
- UTP University of Science and Technology
- PL-85326 Bydgoszcz
- Poland
| |
Collapse
|
182
|
Jassal AK, Rana LK, Hundal G. Structure directing role of amines and water molecules in the self-assembly of polyoxomolybdates. CrystEngComm 2017. [DOI: 10.1039/c6ce02640k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
183
|
Shukla R, Saeed A, Simpson J, Chopra D. Quantitative investigation of C–H⋯π and other intermolecular interactions in a series of crystalline N-(substituted phenyl)-2-naphthamide derivatives. CrystEngComm 2017. [DOI: 10.1039/c7ce01310h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this study, we have investigated the nature and characteristics of different intermolecular interactions present in a series of sevenN-(substituted phenyl)-2-naphthamides.
Collapse
Affiliation(s)
- Rahul Shukla
- Crystallography and Crystal Chemistry Laboratory
- Department of Chemistry
- IISER Bhopal
- Bhopal 462066
- India
| | - Aamer Saeed
- Department of Chemistry
- Quaid-i-Azam University-45320
- Islamabad
- Pakistan
| | - Jim Simpson
- Department of Chemistry
- University of Otago
- Dunedin 9054
- New Zealand
| | - Deepak Chopra
- Crystallography and Crystal Chemistry Laboratory
- Department of Chemistry
- IISER Bhopal
- Bhopal 462066
- India
| |
Collapse
|
184
|
Shukla R, Khan I, Ibrar A, Simpson J, Chopra D. Complex electronic interplay of σ-hole and π-hole interactions in crystals of halogen substituted 1,3,4-oxadiazol-2(3H)-thiones. CrystEngComm 2017. [DOI: 10.1039/c7ce00678k] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
|
185
|
Krishnaswamy S, Chand DK. cis-Protected palladium(ii) based binuclear complexes as tectons in crystal engineering and the imperative role of the cis-protecting agent. CrystEngComm 2017. [DOI: 10.1039/c7ce00654c] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The shape and molecular packing of cis-protected Pd(ii) based binuclear complexes depends upon the ligand and cis-protecting agents.
Collapse
Affiliation(s)
| | - Dillip Kumar Chand
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai 600036
- India
| |
Collapse
|
186
|
Saha B, Bhattacharyya PK. B–Hb⋯π interaction in borane–graphene complexes: coronene as a case study. NEW J CHEM 2017. [DOI: 10.1039/c7nj00057j] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
N/B/BN doping in graphene enhances adsorption of boranes.
Collapse
|
187
|
Kultaeva A, Biktagirov T, Bergmann J, Hensel L, Krautscheid H, Pöppl A. A combined continuous wave electron paramagnetic resonance and DFT calculations of copper-doped 3∞[Cd0.98Cu0.02(prz-trz-ia)] metal–organic framework. Phys Chem Chem Phys 2017; 19:31030-31038. [DOI: 10.1039/c7cp06420a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Successful combination of EPR and DFT was applied for investigation the novel heteronuclear MOF compounds.
Collapse
Affiliation(s)
- Anastasia Kultaeva
- University Leipzig
- Faculty of Physics and Earth Science
- D-04103 Leipzig
- Germany
| | | | - Jens Bergmann
- University Leipzig
- Faculty of Chemistry and Mineralogy
- D-04103 Leipzig
- Germany
| | - Linda Hensel
- University Leipzig
- Faculty of Physics and Earth Science
- D-04103 Leipzig
- Germany
| | - Harald Krautscheid
- University Leipzig
- Faculty of Chemistry and Mineralogy
- D-04103 Leipzig
- Germany
| | - Andreas Pöppl
- University Leipzig
- Faculty of Physics and Earth Science
- D-04103 Leipzig
- Germany
| |
Collapse
|
188
|
Voda I, Makhloufi G, Lozan V, Shova S, Heering C, Janiak C. Mixed-ligand cobalt, nickel and zinc coordination polymers based on flexible 1,4-bis((1H-imidazol-1-yl)methyl)benzene and rigid carboxylate linkers. Inorganica Chim Acta 2017. [DOI: 10.1016/j.ica.2016.10.007] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
189
|
Pfeiffer CR, Pearce N, Champness NR. Complexity of two-dimensional self-assembled arrays at surfaces. Chem Commun (Camb) 2017; 53:11528-11539. [DOI: 10.1039/c7cc06110b] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
The developing field of complexity in self-assembled systems on surfaces is discussed.
Collapse
|
190
|
Putra OD, Umeda D, Nugraha YP, Furuishi T, Nagase H, Fukuzawa K, Uekusa H, Yonemochi E. Solubility improvement of epalrestat by layered structure formation via cocrystallization. CrystEngComm 2017. [DOI: 10.1039/c7ce00284j] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
|
191
|
Romasanta AKS, Braga D, Duarte MT, Grepioni F. How similar is similar? Exploring the binary and ternary solid solution landscapes of p-methyl/chloro/bromo-benzyl alcohols. CrystEngComm 2017. [DOI: 10.1039/c6ce02282k] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
192
|
Yang D, Gong N, Zhang L, Lu Y, Du G. Structural and Computational Study of 4 New Solvatomorphs of Betulin: A Combined X-Ray, Hirshfeld Surface, and Thermal Analysis. J Pharm Sci 2016; 106:826-834. [PMID: 27989367 DOI: 10.1016/j.xphs.2016.11.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2016] [Revised: 10/23/2016] [Accepted: 11/01/2016] [Indexed: 11/27/2022]
Abstract
Four new solvatomorphs of betulin were reported and characterized by X-ray diffractometry as well as thermal and vibrational spectroscopic analyses. Single-crystal X-ray diffraction was used to analyze the X-ray structures of the compounds and confirmed the stoichiometric ratio between the host and guest molecules from thermal data. Results indicated that solvatomorphism occurred in several betulin solvates. Changes in intermolecular arrangements, stoichiometry, and hydrogen-bonding interactions of solvatomorphs were due to solvent incorporation to solvates. Hirshfeld surface analyses, especially dnorm surface and fingerprint plots, were used to determine intermolecular interactions in the crystal network. Solvent molecules played an important role in the construction of a 3D architecture. The stabilities of these solvates were evaluated by thermal analyses. Nonisothermal kinetic analysis was used to explain the kinetics of solid-solid phase transition (desolvation) of betulin solvates. The apparent activation energies were evaluated using Kissinger and Ozawa methods. Moreover, phase transitions were visually investigated by hot-stage microscopic analysis.
Collapse
Affiliation(s)
- Dezhi Yang
- Beijing City Key Laboratory of Polymorphic Drugs, Center of Pharmaceutical Polymorphs, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Ningbo Gong
- Beijing City Key Laboratory of Polymorphic Drugs, Center of Pharmaceutical Polymorphs, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Li Zhang
- Beijing City Key Laboratory of Polymorphic Drugs, Center of Pharmaceutical Polymorphs, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Yang Lu
- Beijing City Key Laboratory of Polymorphic Drugs, Center of Pharmaceutical Polymorphs, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
| | - Guanhua Du
- Beijing City Key Laboratory of Drug Target and Screening Research, National Center for Pharmaceutical Screening, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| |
Collapse
|
193
|
Khanpour M, Naghipour A, Azhdari Tehrani A, Morsali A, Morales-Morales D, Yunessnia Lehi A. The Role of Weak Intermolecular Interactions in the Assembly of a Series of d10 Metal Coordination Polymers Based on N,Nʹ-Bis-Pyridin-3-Ylmethylene-Naphtalene-1,5-Diamine Ligand; Ultrasonic Synthesis, Spectroscopic and Structural Characterization. J Inorg Organomet Polym Mater 2016. [DOI: 10.1007/s10904-016-0479-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
194
|
|
195
|
Perdih F. Cu II and Zn II β-diketonate coordination polymers based on pyrimidin-2-amine, pyrazine and 1,2-bis(4-pyridyl)ethane. ACTA CRYSTALLOGRAPHICA SECTION B, STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS 2016; 72:828-835. [PMID: 27910833 DOI: 10.1107/s2052520616014566] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Accepted: 09/13/2016] [Indexed: 06/06/2023]
Abstract
Copper(II) and zinc(II) bis(4,4,4-trifluoro-1-phenylbutane-1,3-dionato) compounds with pyrimidin-2-amine (pyr2a), pyrazine (pyz) and 1,2-bis(4-pyridyl)ethane (dpet) were prepared and solid-state structures of coordination polymers [M(tfpb)2(pyr2a)]∞ [M = Cu (1), Zn (2); tfpb = 4,4,4-trifluoro-1-phenylbutane-1,3-dionate], [M(tfpb)2(pyz)]∞ [M = Cu (3), Zn (4a, 4b)] and [Cu(tfpb)2(dpet)]∞ (5), respectively, were determined by single-crystal X-ray analysis. The coordination of metal centers in all compounds is octahedral with nitrogen ligands occupying the axial positions. Compound (1) crystallizes in the triclinic space group P\bar 1, whereas (2) crystallizes in the monoclinic space group P2/n. Differences are due to the different orientation of adjacent M(tfpb)2 units, whereas the orientation of pyrimidin-2-amine is the same in both compounds. Polymeric chains in (1) and (2) contain intramolecular N-H...O hydrogen bonding between amino and carbonyl groups. Room-temperature structures (3) and (4a) are isomorphous adopting the monoclinic space group C2/m; however, on cooling crystals (4a) to 150 K a single-crystal-to-single-crystal transformation to (4b) possessing the triclinic space group P\bar 1 was observed. Compound (5) crystallizes in the triclinic space group P\bar 1 and contains a parallel aggregation of chains in contrast to the known structure of the non-fluorinated benzoylacetonato ligand, where chains aggregate in a perpendicular fashion. In the compounds studied intramolecular C-H...O and/or C-H...F interactions are present. The neighboring chains are linked by π...π interactions and in some compounds also by C-H...π interactions [(1), (4b), (5)].
Collapse
Affiliation(s)
- Franc Perdih
- Faculty of Chemistry and Chemical Technology, University of Ljubljana, Večna pot 113, PO Box 537, SI-1000 Ljubljana, Slovenia
| |
Collapse
|
196
|
Geiger DK, DeStefano MR. Conformational differences and intermolecular C-H...N interactions in three polymorphs of a bis(pyridinyl)-substituted benzimidazole. Acta Crystallogr C Struct Chem 2016; 72:867-874. [PMID: 27811428 DOI: 10.1107/s2053229616015837] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Accepted: 10/07/2016] [Indexed: 11/10/2022] Open
Abstract
The structural characterization of several polymorphic forms of a compound allow the interplay between molecular conformation and intermolecular interactions to be studied, which can contribute to the development of strategies for the rational preparation of materials with desirable properties and the tailoring of intermolecular interactions to produce solids with predictable characteristics of interest in crystal engineering. The crystal structures of two new polymorphs of 5,6-dimethyl-2-(pyridin-2-yl)-1-[(pyridin-2-yl)methyl]-1H-benzimidazole, C20H18N4, are reported. The previously reported polymorph, (1) [Geiger & DeStefano (2014). Acta Cryst. E70, o365], exhibits the space group C2/c, whereas polymorphs (2) and (3) presented here are in the Pnma and P-1 space groups, respectively. The molecular structures of the three forms differ in their orientations of the 2-(pyridin-2-yl)- and 1-[(pyridin-2-yl)methyl]- substituents. Density functional theory (DFT) calculations show that the relative energies of the molecule in the three conformations follows the order (1) < (2) < (3), with a spread of 10.6 kJ mol-1. An analysis of the Hirshfeld surfaces shows that the three polymorphs exhibit intermolecular C-H...N interactions, which can be classified into six types. Based on DFT calculations involving pairs of molecules having the observed interactions, the C-H...N energy in the systems explored is approximately -11.2 to -14.4 kJ mol-1.
Collapse
Affiliation(s)
- David K Geiger
- Department of Chemistry, SUNY-College at Geneseo, Geneseo, NY 14454, USA
| | | |
Collapse
|
197
|
Dey D, Mondal RK, Dhibar S, Lin CH, Schollmeyer D, Chopra D, Dey B. Insights into the supramolecular features in isopropylmalonic and n-butylmalonic acids: Inputs from PIXEL and Hirshfeld surface analysis. J Mol Struct 2016. [DOI: 10.1016/j.molstruc.2016.05.076] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
198
|
Lo YC, Chang YJ, Chhetri PM, Huang WJ, Chen JD. Construction of coordination polymers based on bis-pyridyl-bis-amide and dicarboxylate ligands. Polyhedron 2016. [DOI: 10.1016/j.poly.2016.07.026] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
199
|
Zhang C, Wang J, Zhang Y, Zhang X, Ma J, Liu L, Xu X. Co-containing metal organic framework with a linear bis-imidazole and dicarboxylate: Electrochemical and electrocatalytic properties. Polyhedron 2016. [DOI: 10.1016/j.poly.2016.07.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
|
200
|
|