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Preparation and structure analysis of non-covalent interactions mediated 2D-3D supramolecular adducts from 6-methylnicotinamide and carboxylic acids. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.133135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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2
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Garg U, Azim Y. Experimental and computational analyses of the cocrystal of Tetrahydrofuran-2,3,4,5-tetracarboxylic acid and urea. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.133820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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Garg U, Azim Y, Alam M. In acid-aminopyrimidine continuum: experimental and computational studies of furan tetracarboxylate-2-aminopyrimidinium salt. RSC Adv 2021; 11:21463-21474. [PMID: 35478783 PMCID: PMC9034213 DOI: 10.1039/d1ra01714d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Accepted: 06/08/2021] [Indexed: 12/27/2022] Open
Abstract
Salts and cocrystals are the two important solid forms when a carboxylic acid crystallizes with an aminopyrimidine base such that the extent of proton transfer distinguishes between them. The ΔpKa value (pKa(base) − pKa(acid)) predicts whether the proton transfer will occur or not. However, the ΔpKa range, 0 < ΔpKa < 3, is elusive where the formation of cocrystal or salt cannot be predicted. The current study has been done to obtain a generalization in this elusive range with the Cambridge Structural Database (CSD). Based on the generalization, a novel salt (FTCA)−(2-AP)+ of furantetracarboxylic acid (FTCA) with 2-aminopyrimidine (2-AP) is obtained. The structural confirmation was done by single-crystal X-ray diffraction (SCXRD). Density functional theory (DFT) calculations were performed at the IEF-PCM-B3LYP-D3/6-311G(d,p) level to optimize the geometrical coordinates of salt for frontier molecular orbitals (FMOs) and molecular electrostatic potential (MESP). The geometrical parameters of most of the atoms of the optimized salt structure were comparable with SCXRD data. Additionally, results of other computational methods such as ab initio (Hartree–Fock; HF and second-order-Møller–Plesset perturbation; MP2) and semi-empirical were also compared with experimental results of the salt. Quantum theory of atoms in molecules (QTAIM), reduced density gradient (RDG), and natural bond orbital (NBO) analyses were done to calculate the strength and nature of non-covalent interactions present in the salt. Furthermore, Hirshfeld surface analysis, interaction energy calculations, and total energy frameworks were performed for qualitative and quantitative estimations of strong and weak intermolecular interactions. Generalization in the elusive ΔpKa range, experimental and computational studies of furan tetracarboxylate-2-aminopyrimidinium salt.![]()
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Affiliation(s)
- Utsav Garg
- Department of Applied Chemistry, Zakir Husain College of Engineering & Technology, Aligarh Muslim University Aligarh 202002 Uttar Pradesh India
| | - Yasser Azim
- Department of Applied Chemistry, Zakir Husain College of Engineering & Technology, Aligarh Muslim University Aligarh 202002 Uttar Pradesh India
| | - Mahboob Alam
- Division of Chemistry & Biotechnology, Dongguk University 123 Dongdae-ro Gyeongju Republic of Korea
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Garg U, Azim Y, Kar A, Pradeep CP. Cocrystals/salt of 1-naphthaleneacetic acid and utilizing Hirshfeld surface calculations for acid–aminopyrimidine synthons. CrystEngComm 2020. [DOI: 10.1039/d0ce00106f] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Revisit of acid–aminopyrimidine synthons to explore the robustness in presence of linear hetrotetramer and heterotrimer synthon.
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Affiliation(s)
- Utsav Garg
- Department of Applied Chemistry
- Z.H. College of Engineering & Technology
- Aligarh Muslim University
- Aligarh
- India
| | - Yasser Azim
- Department of Applied Chemistry
- Z.H. College of Engineering & Technology
- Aligarh Muslim University
- Aligarh
- India
| | - Aranya Kar
- School of Basic Sciences
- Indian Institute of Technology Mandi
- India
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Yelgaonkar SP, Kiani D, Baltrusaitis J, MacGillivray LR. Superstructural diversity in salt-cocrystals: higher-order hydrogen-bonded assemblies formed using U-shaped dications and with assistance of π --π stacking. Chem Commun (Camb) 2020; 56:6708-6710. [PMID: 32420555 DOI: 10.1039/d0cc02671a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Salt cocrystals with components that assemble by hydrogen bonds and aromatic anion-molecule stacks (π--π stacks) are reported. U-shaped bipyridines and an isocoumarin carboxylic acid self-assemble to form 5-, 6-, and 10-component aggregates with components in double and quadruple face-to-face stacks. DFT calculations support the π--π stacks to help stabilize the salt cocrystals.
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Affiliation(s)
| | - Daniyal Kiani
- Department of Chemical and Biomolecular Engineering, Lehigh University, B336 Iacocca Hall, 111 Research Drive, Bethlehem, Pennsylvania 18015, USA
| | - Jonas Baltrusaitis
- Department of Chemical and Biomolecular Engineering, Lehigh University, B336 Iacocca Hall, 111 Research Drive, Bethlehem, Pennsylvania 18015, USA
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Rajam A, Muthiah PT, Butcher RJ, Jasinski JP, Wikaira J. Design of two series of 1:1 cocrystals involving 4-amino-5-chloro-2,6-dimethylpyrimidine and carboxylic acids. ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY 2018; 74:1007-1019. [PMID: 30191892 DOI: 10.1107/s2053229618009154] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2018] [Accepted: 06/25/2018] [Indexed: 11/10/2022]
Abstract
Two series of a total of ten cocrystals involving 4-amino-5-chloro-2,6-dimethylpyrimidine with various carboxylic acids have been prepared and characterized by single-crystal X-ray diffraction. The pyrimidine unit used for the cocrystals offers two ring N atoms (positions N1 and N3) as proton-accepting sites. Depending upon the site of protonation, two types of cations are possible [Rajam et al. (2017). Acta Cryst. C73, 862-868]. In a parallel arrangement, two series of cocrystals are possible depending upon the hydrogen bonding of the carboxyl group with position N1 or N3. In one series of cocrystals, i.e. 4-amino-5-chloro-2,6-dimethylpyrimidine-3-bromothiophene-2-carboxylic acid (1/1), 1, 4-amino-5-chloro-2,6-dimethylpyrimidine-5-chlorothiophene-2-carboxylic acid (1/1), 2, 4-amino-5-chloro-2,6-dimethylpyrimidine-2,4-dichlorobenzoic acid (1/1), 3, and 4-amino-5-chloro-2,6-dimethylpyrimidine-2-aminobenzoic acid (1/1), 4, the carboxyl hydroxy group (-OH) is hydrogen bonded to position N1 (O-H...N1) of the corresponding pyrimidine unit (single point supramolecular synthon). The inversion-related stacked pyrimidines are doubly bridged by the carboxyl groups via N-H...O and O-H...N hydrogen bonds to form a large cage-like tetrameric unit with an R42(20) graph-set ring motif. These tetrameric units are further connected via base pairing through a pair of N-H...N hydrogen bonds, generating R22(8) motifs (supramolecular homosynthon). In the other series of cocrystals, i.e. 4-amino-5-chloro-2,6-dimethylpyrimidine-5-methylthiophene-2-carboxylic acid (1/1), 5, 4-amino-5-chloro-2,6-dimethylpyrimidine-benzoic acid (1/1), 6, 4-amino-5-chloro-2,6-dimethylpyrimidine-2-methylbenzoic acid (1/1), 7, 4-amino-5-chloro-2,6-dimethylpyrimidine-3-methylbenzoic acid (1/1), 8, 4-amino-5-chloro-2,6-dimethylpyrimidine-4-methylbenzoic acid (1/1), 9, and 4-amino-5-chloro-2,6-dimethylpyrimidine-4-aminobenzoic acid (1/1), 10, the carboxyl group interacts with position N3 and the adjacent 4-amino group of the corresponding pyrimidine ring via O-H...N and N-H...O hydrogen bonds to generate the robust R22(8) supramolecular heterosynthon. These heterosynthons are further connected by N-H...N hydrogen-bond interactions in a linear fashion to form a chain-like arrangement. In cocrystal 1, a Br...Br halogen bond is present, in cocrystals 2 and 3, Cl...Cl halogen bonds are present, and in cocrystals 5, 6 and 7, Cl...O halogen bonds are present. In all of the ten cocrystals, π-π stacking interactions are observed.
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Affiliation(s)
- Ammaiyappan Rajam
- School of Chemistry, Bharathidasan University, Tiruchirappalli 620 024, Tamilnadu, India
| | | | - Raymond John Butcher
- Department of Chemistry, Howard University, 525 College Street NW, Washington, DC 20059, USA
| | - Jerry P Jasinski
- Department of Chemistry, Keene State College, 229 Main Street, Keene, NH 03435-2001, USA
| | - Jan Wikaira
- Department of Chemistry, University of Canterbury, Private Bag 4800, Christchurch, New Zealand
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7
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Abidi SSA, Azim Y, Gupta AK, Pradeep CP. Cocrystals of indole-3-acetic acid and indole-3-butyric acid: Synthesis, structural characterization and Hirshfeld surface analysis. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.04.035] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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9
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Mechanochemical synthesis and structural characterization of three novel cocrystals of dimethylglyoxime with N-heterocyclic aromatic compounds and acetamide. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.08.080] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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10
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Oruganti M, Nechipadappu SK, Khade PA, Trivedi DR. Solid-State Versatility of the Molecular Salts/Cocrystals of 2-Chloro-4-nitrobenzoic Acid: A Case Study on Halogen Bonds. ACS OMEGA 2017; 2:7146-7162. [PMID: 31457294 PMCID: PMC6645404 DOI: 10.1021/acsomega.7b00878] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Accepted: 10/09/2017] [Indexed: 06/10/2023]
Abstract
2-Chloro-4-nitrobenzoic acid (2c4n) is an antiviral agent used for the treatment of HIV infection and to boost the immune response in immune deficiency diseases. In the present study, a series of eight molecular salts of 2c4n with pyridyl and benzoic acid derivatives have been synthesized by a crystal engineering approach and were characterized structurally by various spectroscopic, thermal, and X-ray diffraction techniques. Crystal structures of all synthesized molecular salts were determined by single-crystal X-ray diffraction techniques. In all synthesized molecular salts, the charge-assisted acid···pyridine/amine heterosynthon was found to be the primary supramolecular synthon. The synthesized salts, namely, 2c4n.g and 2c4n.h salts were found to be isostructural. Further, in the current work, the occurrence of weak halogen bonds in the presence of strong hydrogen bonds in the synthesized and in the reported molecular salts/cocrystals of 2c4n has been investigated. A detailed inspection of the crystal structures of salts/cocrystals of 2c4n was carried out to demonstrate the importance of halogen bonds in these crystal structures. It was found that 4 out of 8 synthesized molecular salts and 12 out of 24 reported molecular adducts of 2c4n were found to exhibit halogen bonds in their crystal structures. A similar kind of conformational change was observed for molecular salts exhibiting halogen bonds in their crystal structures; however, the conformations were found to be slightly different in other molecular salts. It was observed that two-point primary supramolecular synthon and stronger intramolecular Cl···O halogen bonds in the molecular adducts of 2c4n are found to be more susceptible to exhibit halogen bonds in their crystal structures. Halogen bond interactions played a vital role in the crystal stabilization of these molecular adducts.
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Affiliation(s)
- Madhavi Oruganti
- Supramolecular
Chemistry Laboratory, Department of Chemistry, and Department of
Chemical Engineering, National Institute
of Technology Karnataka (NITK), Surathkal, Srinivasnagar, Mangalore, 575 025 Karnataka, India
| | - Sunil Kumar Nechipadappu
- Supramolecular
Chemistry Laboratory, Department of Chemistry, and Department of
Chemical Engineering, National Institute
of Technology Karnataka (NITK), Surathkal, Srinivasnagar, Mangalore, 575 025 Karnataka, India
| | - Pavan A. Khade
- Supramolecular
Chemistry Laboratory, Department of Chemistry, and Department of
Chemical Engineering, National Institute
of Technology Karnataka (NITK), Surathkal, Srinivasnagar, Mangalore, 575 025 Karnataka, India
| | - Darshak R. Trivedi
- Supramolecular
Chemistry Laboratory, Department of Chemistry, and Department of
Chemical Engineering, National Institute
of Technology Karnataka (NITK), Surathkal, Srinivasnagar, Mangalore, 575 025 Karnataka, India
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11
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Padmavathy R, Karthikeyan N, Sathya D, Jagan R, Kumar RM, Sivakumar K. Crystal structure, DFT study, hirshfeld surface and PIXEL energy calculations of benzimidazolium and hexadecylaminium hydrogen maleate salts. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.01.075] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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12
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Prajina O, Thomas Muthiah P, Geiger DK. Supra-molecular inter-actions in the 1:2 co-crystal of 4,4'-bipyridine and 3-chloro-thio-phene-2-carb-oxy-lic acid. Acta Crystallogr E Crystallogr Commun 2016; 72:1362-1365. [PMID: 27746918 PMCID: PMC5050753 DOI: 10.1107/s2056989016013724] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2016] [Accepted: 08/26/2016] [Indexed: 12/04/2022]
Abstract
The asymmetric unit of the title compound, 2C5H3ClO2S·C10H8N2, is comprised of a mol-ecule of 3-chloro-thio-phene-2-carb-oxy-lic acid (3TPC) and half of a mol-ecule of 4,4'-bi-pyridine (BPY). A distinctive O-H⋯N-based synthon is present. Cl⋯Cl and π-π stacking inter-actions further stabilize the crystal structure, forming a two-dimensional network parallel to the bc plane.
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Affiliation(s)
- Olakkandiyil Prajina
- School of Chemistry, Bharathidasan University, Tiruchirappalli 620 024, Tamilnadu, India
| | | | - David K. Geiger
- Department of Chemistry, SUNY-College at Geneseo, Geneseo, New York 14454, USA
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13
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Rajam A, Thomas Muthiah P, Butcher RJ, Zeller M. Crystal structure of 4-amino-5-chloro-2,6-di-methyl-pyrimidinium thio-phene-2,5-di-carboxyl-ate. Acta Crystallogr E Crystallogr Commun 2016; 72:1043-6. [PMID: 27555959 PMCID: PMC4992934 DOI: 10.1107/s2056989016010148] [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: 05/21/2016] [Accepted: 06/21/2016] [Indexed: 11/10/2022]
Abstract
In the title salt, C6H9ClN3 (+)·C6H3O4S(-), the cations and anions are linked via O-H⋯O and N-H⋯O hydrogen bonds, forming R 6 (6)(37) ring motifs that are inter-connected with each other, producing sheets. Separate parallel inversion-related sheets are linked through N-H⋯N and π-π stacking inter-actions [centroid-centroid distance = 3.5414 (13) Å], forming double layers parallel to (101). Weak C-H⋯O and C-H⋯S hydrogen bonds, as well as C-H⋯π inter-actions, connect the double layers into a three-dimensional network.
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Affiliation(s)
- Ammaiyappan Rajam
- School of Chemistry, Bharathidasan University, Tiruchirappalli 620 024, Tamilnadu, India
| | | | - Ray J. Butcher
- Department of Chemistry, Howard University, 525 College Street NW, Washington, DC 20059, USA
| | - Matthias Zeller
- Department of Chemistry, Youngstown State University, 1 University Plaza, Youngstown, OH 44555, USA
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Prajina O, Thomas Muthiah P, Perdih F. Supra-molecular inter-actions in a 1:1 co-crystal of acridine and 3-chloro-thio-phene-2-carb-oxy-lic acid. Acta Crystallogr E Crystallogr Commun 2016; 72:659-62. [PMID: 27308013 PMCID: PMC4908530 DOI: 10.1107/s2056989016005685] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Accepted: 04/06/2016] [Indexed: 11/30/2022]
Abstract
In the title co-crystal, C5H3ClO2S·C13H9N, the components inter-act with each other via an O-H⋯N hydrogen bond. Acridine-acridine stacking, thio-phene-thio-phene stacking and acridine-thio-phene C-H⋯π inter-actions also occur in the crystal.
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Affiliation(s)
- Olakkandiyil Prajina
- School of Chemistry, Bharathidasan University, Tiruchirappalli 620 024, Tamilnadu, India
| | | | - Franc Perdih
- Faculty of Chemistry and Chemical Technology, University of Ljubljana, Vecna pot 113, PO Box 537, SI-1000 Ljubljana, Slovenia
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15
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de Vries EJC, Kantengwa S, Ayamine A, Báthori NB. Testing the limits of synthon engineering: salts of salicylic and sulfosalicylic acid with nucleobases and derivatives. CrystEngComm 2016. [DOI: 10.1039/c6ce01534d] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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Jasmine NJ, Rajam A, Muthiah PT, Stanley N, Razak IA, Rosli MM. Crystal structure of 2-amino-pyridinium 6-chloro-nicotinate. Acta Crystallogr E Crystallogr Commun 2015; 71:o655-6. [PMID: 26396888 PMCID: PMC4555436 DOI: 10.1107/s2056989015014796] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Accepted: 08/06/2015] [Indexed: 11/21/2022]
Abstract
In the title salt, C5H7N(+)·C6H3ClNO(-), the 2-amino-pyri-din-ium cation inter-acts with the carboxyl-ate group of the 6-chloro-nicotinate anion through a pair of independent N-H⋯O hydrogen bonds, forming an R 2 (2)(8) ring motif. In the crystal, these dimeric units are connected further via N-H⋯O hydrogen bonds, forming chains along [001]. In addition, weak C-H⋯N and C-H⋯O hydrogen bonds, together with weak π-π inter-actions, with centroid-centroid distances of 3.6560 (5) and 3.6295 (5) Å, connect the chains, forming a two-dimensional network parallel to (100).
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Affiliation(s)
- N. Jeeva Jasmine
- School of Chemistry, Bharathidasan University, Tiruchirappalli 620 024, Tamil Nadu, India
| | - A. Rajam
- School of Chemistry, Bharathidasan University, Tiruchirappalli 620 024, Tamil Nadu, India
| | - P. Thomas Muthiah
- School of Chemistry, Bharathidasan University, Tiruchirappalli 620 024, Tamil Nadu, India
| | - N. Stanley
- School of Chemistry, Bharathidasan University, Tiruchirappalli 620 024, Tamil Nadu, India
| | - I. Abdul Razak
- School of Physics, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia
| | - M. Mustaqim Rosli
- School of Physics, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia
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Rajam A, Muthiah P, Butcher RJ, Jasinski JP. Crystal structure of 2-amino-4,6-di-meth-oxy-pyrimidinium thio-phene-2-carboxyl-ate. Acta Crystallogr E Crystallogr Commun 2015; 71:o479-80. [PMID: 26279918 PMCID: PMC4518905 DOI: 10.1107/s2056989015010907] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2015] [Accepted: 06/05/2015] [Indexed: 11/11/2022]
Abstract
In the title salt, C6H10N3O2 (+)·C5H3O2S(-), the 2-amino-4,6-di-meth-oxy-pyrimidinium cation inter-acts with the carboxyl-ate group of the thio-phene-2-carboxyl-ate anion through a pair of N-H⋯O hydrogen bonds, forming an R 2 (2)(8) ring motif. These motifs are centrosymmetrically paired via N-H⋯O hydrogen bonds, forming a complementary DDAA array. The separate DDAA arrays are linked by π-π stacking inter-actions between the pyrimidine rings, as well as by a number of weak C-H⋯O and N-H⋯O inter-actions. In the anion, the dihedral angle between the ring plane and the CO2 group is 11.60 (3)°. In the cation, the C atoms of methoxy groups deviate from the ring plane by 0.433 (10) Å.
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Affiliation(s)
- Ammaiyappan Rajam
- School of Chemistry, Bharathidasan University, Tiruchirappalli 620 024, Tamilnadu, India
| | - P.T. Muthiah
- School of Chemistry, Bharathidasan University, Tiruchirappalli 620 024, Tamilnadu, India
| | - Ray J. Butcher
- Department of Chemistry, Howard University, 525 College Street NW, Washington, DC 20059, USA
| | - Jerry P. Jasinski
- Department of Chemistry, Keene State College, 229 Main Street, Keene, NH 03435-2001, USA
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Kowalska K, Trzybiński D, Sikorski A. Influence of the halogen substituent on the formation of halogen and hydrogen bonding in co-crystals formed from acridine and benzoic acids. CrystEngComm 2015. [DOI: 10.1039/c5ce01321f] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
A series of nine co-crystals formed from acridine and benzoic acids have been synthesized and structurally characterized and the influence of the halogen substituent on the formation of halogen and hydrogen bonding in the co-crystals of the title compounds has been investigated.
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Affiliation(s)
- Kornelia Kowalska
- Faculty of Chemistry
- University of Gdańsk
- W. Stwosza 63
- 80-308 Gdańsk, Poland
| | - Damian Trzybiński
- Faculty of Chemistry
- University of Gdańsk
- W. Stwosza 63
- 80-308 Gdańsk, Poland
| | - Artur Sikorski
- Faculty of Chemistry
- University of Gdańsk
- W. Stwosza 63
- 80-308 Gdańsk, Poland
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Jennifer SJ, Thomas Muthiah P. Syntheses and characterization of two novel tetranuclear lead(II) clusters self-assembled by hydrogen bonded interactions. Chem Cent J 2014; 8:39. [PMID: 24987455 PMCID: PMC4077112 DOI: 10.1186/1752-153x-8-39] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2014] [Accepted: 06/16/2014] [Indexed: 11/22/2022] Open
Abstract
Background The usage of polynuclear metal clusters as secondary building units (SBU’s) in designing of metal organic frameworks (MOF’s) is a field of current interest. These metal clusters have attracted a great deal of attention not only due to their interesting structural topologies but also due to promising physical and chemical properties. In this regard various d,f block (transition and lanthanide) metal clusters have been widely investigated so far. Less attention is paid to construction of heavy p-block Pb(II) clusters. Results Two mixed ligand Pb(II) clusters have been synthesized with bipy(2,2’-Bipyridine), phen(1,10-Phenanthroline), quin (8-Hydroxy quinolinate) and 5-tpc (5-chloro thiophene 2-carboxylate). They have been characterized by elemental analysis, IR, TGA and X-ray crystallography. X-ray diffraction analysis reveals that the complexes [Pb4(quin)4(bipy)2(5-tpc)4] (1) and [Pb4(quin) 4(phen) 2(5-tpc)4] (2) are tetranuclear. The complexes show a slight variation in unit cell parameters, due to the replacement of bipy and the phen ligands. Both complexes contain two types of Pb(II) ions which differ in the coordination geometry around the Pb(II) ion. Conclusions In both complexes the four lead ions Pb1,Pb2, Pb1i and Pb2i lie on the same plane bridged by the 5-tpc anions. Pb1 and Pb2 of both complexes contain a 5-tpc and quin coordinated in a bidentate chelating bridging fashion. In addition the Pb2 and Pb2i ions alone contain a bipy and phen in a bidentate chelating fashion in (1) and (2) respectively. An additional notable feature in both of these complexes are the bridging ability of the quin oxygen which forms a network of coordination bonds in between the four Pb(II) ions. In both complexes the individual units are self-assembled by C-H---Cl/C-H---S hydrogen bonding interactions to generate 2-D aggregates.
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