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Electron density is not spherical: the many applications of the transferable aspherical atom model. Comput Struct Biotechnol J 2022; 20:6237-6243. [DOI: 10.1016/j.csbj.2022.10.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Revised: 10/12/2022] [Accepted: 10/13/2022] [Indexed: 11/20/2022] Open
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Kaspiaruk H, Chęcińska L. A comparison of three crystalline forms of miconazole: solvent-free, ethanol monosolvate and hemihydrate. ACTA CRYSTALLOGRAPHICA SECTION C STRUCTURAL CHEMISTRY 2022; 78:343-350. [DOI: 10.1107/s2053229622004909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Accepted: 05/06/2022] [Indexed: 11/11/2022]
Abstract
The crystal structures of miconazole {MIC, C18H14Cl4N2O, systematic name (RS)-1-[2-(2,4-dichlorobenzyloxy)-2-(2,4-dichlorophenyl)ethyl]-1H-imidazole}, its ethanol monosolvate (C18H14Cl4N2O·C2H5OH) and its hemihydrate (C18H14Cl4N2O·0.5H2O) were compared. A detailed comparison of the molecular conformation of the miconazole molecules showed a structural similarity of the solvate forms, whereas the unsolvated form is related to the gas-phase structure. This suggests that the molecular conformation of miconazole is influenced by solvent molecules. The crystal architectures of the considered solvatomorphs are differentiated by the intermolecular interactions formed by ethanol and water molecules. The structural studies are enriched by Hirshfeld surface and energy framework analysis. The pairwise model energies of the dominant contacts were estimated to be in the range 20–70 kJ mol−1. It is interesting that the contribution of dispersive forces predominates over the electrostatic forces.
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Supramolecular Self-Assembly Built by Hydrogen, Stacking and Br···Br Interactions in 4-((4-Bromobenzyl)Selanyl)Aniline: Structure, Hirshfeld Surface Analysis, 3D Energy Framework Approach and Global Reactivity Descriptors. J Inorg Organomet Polym Mater 2022. [DOI: 10.1007/s10904-022-02284-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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Tan SL, Tiekink ERT. Non-covalent interactions involving remote substituents influence the topologies of supramolecular chains featuring hydroxyl-O–H⋯O(hydroxyl) hydrogen bonding in crystals of (HOCH 2CH 2) 2NC(S)N(H)(C 6H 4Y-4) for Y = H, Me, Cl and NO 2. CrystEngComm 2021. [DOI: 10.1039/d0ce01810d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Secondary non-covalent interactions prove crucial in determining the topology of supramolecular chains sustained by conventional O–H⋯O hydrogen bonding.
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Affiliation(s)
- Sang Loon Tan
- Research Centre for Crystalline Materials
- School of Science and Technology
- Sunway University
- 47500 Bandar Sunway
- Malaysia
| | - Edward R. T. Tiekink
- Research Centre for Crystalline Materials
- School of Science and Technology
- Sunway University
- 47500 Bandar Sunway
- Malaysia
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Symmetric Fluoroborate and its Boron Modification: Crystal and Electronic Structures. CRYSTALS 2019. [DOI: 10.3390/cryst9120662] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Four boron-carrying molecules were synthesized and purified. These were found to be (a) relatively neutral with respect to the parent BF derivative and (b) functionalized by donor–acceptor groups resulting in a charge transfer within the molecule. The study discusses the steric effect and the influence of the substitution of the side rings on the surroundings of the boron atom. Electronic structures were characterized by real-space bonding indicators. Hirshfeld surface and energy frameworks tools were applied to examine the crystal packing features.
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Tonin MD, Garden SJ, Jotani MM, Wardell JL, Tiekink ER. On the influence of small chemical changes upon the supramolecular association in substituted 2-(phenoxy)-1,4-naphthoquinones. Z KRIST-CRYST MATER 2018. [DOI: 10.1515/zkri-2018-2129] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Abstract
X-ray crystallography reveals the common feature of the title compounds is a 1,4-naphthoquinone ring system with a substituted phenoxy residue adjacent to an oxo-group to give 1 (H), 2 (3-Br), 3 (3-CF3), 4 (4-CN) and 5 (4-NO2). To a first approximation the fused ring system along with the two oxo substituents is planar with the major difference between the molecules relating to the relative orientations of the pendant phenoxy residues: dihedral angles range from 56.56(4)° (3) to 87.52(10)° (2). The presence of intermolecular C–H···O interactions is the common feature of the supramolecular association in the crystals of 1–5. In each of 1 and 5, these extend in three-dimensions but, only to supramolecular dimers in 4, chains in 2 and layers in 3. Each crystal also features C=O···π interactions, pointing to the importance of these points of contact in this series di-oxocompounds. In 2, these, along with C–Br···π interactions lead to a three-dimensional architecture. For 3, the C=O···π and π···π interactions occur within the layers which stack without directional interactions between them. In 4, C–H···O and C=O···π interactions combine to give a supramolecular layer, which also stack without directional interactions in the inter-layer region. Further analysis of the molecular packing was conducted by a Hirshfeld surface analysis (HSA). This points to the significant role of H···H, C···H/H···C and O···H/H···O contacts in the packing of 1. Notably different roles for these contacts are found in the other crystals correlating with the participation of the respective substituents in the molecular packing. The HSA suggests the association between layers in 3 (weak F···F and H···F interactions) and 4 (weak H···N interactions) is contributed by the phenoxy-substituents.
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Affiliation(s)
- Marlon D.L. Tonin
- Instituto de Química, Universidade Federal do Rio de Janeiro, Centro de Tecnologia, Bloco A, Cidade Universitária , 21941-909 Rio de Janeiro-RJ , Brazil
| | - Simon J. Garden
- Instituto de Química, Universidade Federal do Rio de Janeiro, Centro de Tecnologia, Bloco A, Cidade Universitária , 21941-909 Rio de Janeiro-RJ , Brazil
| | - Mukesh M. Jotani
- Department of Physics , Bhavan’s Sheth R. A. College of Science , Ahmedabad, 380001 Gujarat , India
| | - James L. Wardell
- Department of Chemistry , University of Aberdeen , Old Aberdeen AB24 3UE , Scotland
| | - Edward R.T. Tiekink
- Research Centre for Crystalline Materials, School of Science and Technology , Sunway University , 47500 Bandar Sunway, Selangor Darul Ehsan , Malaysia
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