101
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Neutral discrete metal–organic cyclic architectures: Opportunities for structural features and properties in confined spaces. Coord Chem Rev 2014. [DOI: 10.1016/j.ccr.2014.07.012] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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102
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Evans NH, Beer PD. Advances in anion supramolecular chemistry: from recognition to chemical applications. Angew Chem Int Ed Engl 2014; 53:11716-54. [PMID: 25204549 DOI: 10.1002/anie.201309937] [Citation(s) in RCA: 425] [Impact Index Per Article: 42.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2013] [Indexed: 12/11/2022]
Abstract
Since the start of this millennium, remarkable progress in the binding and sensing of anions has been taking place, driven in part by discoveries in the use of hydrogen bonding, as well as the previously under-exploited anion-π interactions and halogen bonding. However, anion supramolecular chemistry has developed substantially beyond anion recognition, and now encompasses a diverse range of disciplines. Dramatic advance has been made in the anion-templated synthesis of macrocycles and interlocked molecular architectures, while the study of transmembrane anion transporters has flourished from almost nothing into a rapidly maturing field of research. The supramolecular chemistry of anions has also found real practical use in a variety of applications such as catalysis, ion extraction, and the use of anions as stimuli for responsive chemical systems.
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Affiliation(s)
- Nicholas H Evans
- Department of Chemistry, Lancaster University, Lancaster, LA1 4YB (UK).
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103
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Evans NH, Beer PD. Supramolekulare Chemie von Anionen: von der Erkennung zur chemischen Anwendung. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201309937] [Citation(s) in RCA: 83] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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104
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Liu TP, Huo LH, Deng ZP, Zhao H, Gao S. Supramolecular architectures and luminescent properties of the salts containing flexible bis(pyridyl) cations with aliphatic diamine spacer: effects of inorganic anions, alkalinity and conformation of the bis(pyridyl) cations. RSC Adv 2014. [DOI: 10.1039/c4ra05029k] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
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105
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Franconetti A, Contreras-Bernal L, Jatunov S, Gómez-Guillén M, Angulo M, Prado-Gotor R, Cabrera-Escribano F. Electronically tunable anion−π interactions in pyrylium complexes: experimental and theoretical studies. Phys Chem Chem Phys 2014; 16:18442-53. [DOI: 10.1039/c4cp01977f] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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106
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Wheeler SE, Bloom JWG. Toward a more complete understanding of noncovalent interactions involving aromatic rings. J Phys Chem A 2014; 118:6133-47. [PMID: 24937084 DOI: 10.1021/jp504415p] [Citation(s) in RCA: 230] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Noncovalent interactions involving aromatic rings, which include π-stacking interactions, anion-π interactions, and XH-π interactions, among others, are ubiquitous in chemical and biochemical systems. Despite dramatic advances in our understanding of these interactions over the past decade, many aspects of these noncovalent interactions have only recently been uncovered, with many questions remaining. We summarize our computational studies aimed at understanding the impact of substituents and heteroatoms on these noncovalent interactions. In particular, we discuss our local, direct interaction model of substituent effects in π-stacking interactions. In this model, substituent effects are dominated by electrostatic interactions of the local dipoles associated with the substituents and the electric field of the other ring. The implications of the local nature of substituent effects on π-stacking interactions in larger systems are discussed, with examples given for complexes with carbon nanotubes and a small graphene model, as well as model stacked discotic systems. We also discuss related issues involving the interpretation of electrostatic potential (ESP) maps. Although ESP maps are widely used in discussions of noncovalent interactions, they are often misinterpreted. Next, we provide an alternative explanation for the origin of anion-π interactions involving substituted benzenes and N-heterocycles, and show that these interactions are well-described by simple models based solely on charge-dipole interactions. Finally, we summarize our recent work on the physical nature of substituent effects in XH-π interactions. Together, these results paint a more complete picture of noncovalent interactions involving aromatic rings and provide a firm conceptual foundation for the rational exploitation of these interactions in a myriad of chemical contexts.
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Affiliation(s)
- Steven E Wheeler
- Department of Chemistry, Texas A&M University , College Station, Texas 77842, United States
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107
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Ye HY, Li SH, Zhang Y, Zhou L, Deng F, Xiong RG. Solid State Molecular Dynamic Investigation of An Inclusion Ferroelectric: [(2,6-Diisopropylanilinium)([18]crown-6)]BF4. J Am Chem Soc 2014; 136:10033-40. [DOI: 10.1021/ja503344b] [Citation(s) in RCA: 128] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Heng-Yun Ye
- Ordered
Matter Science Research Center, Southeast University, Nanjing 211189, P. R. China
| | - Shen-Hui Li
- State
Key Laboratory Magnetic Resonance and Atomic and Molecular Physics,
Wuhan Center for Magnetic Resonance, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences; Wuhan 430071, P. R. China
| | - Yi Zhang
- Ordered
Matter Science Research Center, Southeast University, Nanjing 211189, P. R. China
| | - Lei Zhou
- State
Key Laboratory Magnetic Resonance and Atomic and Molecular Physics,
Wuhan Center for Magnetic Resonance, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences; Wuhan 430071, P. R. China
| | - Feng Deng
- State
Key Laboratory Magnetic Resonance and Atomic and Molecular Physics,
Wuhan Center for Magnetic Resonance, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences; Wuhan 430071, P. R. China
| | - Ren-Gen Xiong
- Ordered
Matter Science Research Center, Southeast University, Nanjing 211189, P. R. China
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108
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Riddell IA, Ronson TK, Clegg JK, Wood CS, Bilbeisi RA, Nitschke JR. Cation- and Anion-Exchanges Induce Multiple Distinct Rearrangements within Metallosupramolecular Architectures. J Am Chem Soc 2014; 136:9491-8. [DOI: 10.1021/ja504748g] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Imogen A. Riddell
- Department of Chemistry, University of Cambridge, Lensfield
Road, Cambridge CB2 1EW, United Kingdom
| | - Tanya K. Ronson
- Department of Chemistry, University of Cambridge, Lensfield
Road, Cambridge CB2 1EW, United Kingdom
| | - Jack K. Clegg
- Department of Chemistry, University of Cambridge, Lensfield
Road, Cambridge CB2 1EW, United Kingdom
| | - Christopher S. Wood
- Department of Chemistry, University of Cambridge, Lensfield
Road, Cambridge CB2 1EW, United Kingdom
| | - Rana A. Bilbeisi
- Department of Chemistry, University of Cambridge, Lensfield
Road, Cambridge CB2 1EW, United Kingdom
| | - Jonathan R. Nitschke
- Department of Chemistry, University of Cambridge, Lensfield
Road, Cambridge CB2 1EW, United Kingdom
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109
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Bilbeisi RA, Olsen JC, Charbonnière LJ, Trabolsi A. Self-assembled discrete metal–organic complexes: Recent advances. Inorganica Chim Acta 2014. [DOI: 10.1016/j.ica.2013.12.015] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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110
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Martí I, Bolte M, Burguete MI, Vicent C, Alfonso I, Luis SV. Tight and Selective Caging of Chloride Ions by a Pseudopeptidic Host. Chemistry 2014; 20:7458-64. [DOI: 10.1002/chem.201303604] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2013] [Revised: 03/24/2014] [Indexed: 11/12/2022]
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111
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Ramsay WJ, Nitschke JR. Two Distinct Allosteric Active Sites Regulate Guest Binding Within a Fe8Mo1216+ Cubic Receptor. J Am Chem Soc 2014; 136:7038-43. [DOI: 10.1021/ja501809s] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- William J. Ramsay
- Department of Chemistry, University of Cambridge, Lensfield
Road, Cambridge, CB2 1EW, United Kingdom
| | - Jonathan R. Nitschke
- Department of Chemistry, University of Cambridge, Lensfield
Road, Cambridge, CB2 1EW, United Kingdom
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112
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Bauzá A, Quiñonero D, Deyà PM, Frontera A. Long-Range Effects in Anion-π Interactions: Their Crucial Role in the Inhibition Mechanism ofMycobacterium TuberculosisMalate Synthase. Chemistry 2014; 20:6985-90. [DOI: 10.1002/chem.201304995] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Indexed: 01/08/2023]
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113
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Jiménez A, Bilbeisi RA, Ronson TK, Zarra S, Woodhead C, Nitschke JR. Selective Encapsulation and Sequential Release of Guests Within a Self-Sorting Mixture of Three Tetrahedral Cages. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201400541] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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114
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Jiménez A, Bilbeisi RA, Ronson TK, Zarra S, Woodhead C, Nitschke JR. Selective Encapsulation and Sequential Release of Guests Within a Self-Sorting Mixture of Three Tetrahedral Cages. Angew Chem Int Ed Engl 2014; 53:4556-60. [DOI: 10.1002/anie.201400541] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2014] [Indexed: 11/11/2022]
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115
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Meng W, League AB, Ronson TK, Clegg JK, Isley WC, Semrouni D, Gagliardi L, Cramer CJ, Nitschke JR. Empirical and Theoretical Insights into the Structural Features and Host–Guest Chemistry of M8L4 Tube Architectures. J Am Chem Soc 2014; 136:3972-80. [DOI: 10.1021/ja412964r] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Wenjing Meng
- Department
of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, U.K
| | - Aaron B. League
- Department of Chemistry, Chemical Theory Center, and Supercomputer
Institute, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Tanya K. Ronson
- Department
of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, U.K
| | - Jack K. Clegg
- Department
of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, U.K
| | - William C. Isley
- Department of Chemistry, Chemical Theory Center, and Supercomputer
Institute, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - David Semrouni
- Department of Chemistry, Chemical Theory Center, and Supercomputer
Institute, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Laura Gagliardi
- Department of Chemistry, Chemical Theory Center, and Supercomputer
Institute, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Christopher J. Cramer
- Department of Chemistry, Chemical Theory Center, and Supercomputer
Institute, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Jonathan R. Nitschke
- Department
of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, U.K
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116
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Robertazzi A, Platts JA, Gamez P. Anion⋅⋅⋅Si Interactions in an Inverse Sandwich Complex: A Computational Study. Chemphyschem 2014; 15:912-7. [DOI: 10.1002/cphc.201400018] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2014] [Indexed: 11/07/2022]
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117
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Formation of a Magnetically Coupled Neutral [4×4] Square Grid from a 2,6-Pyridinedicarbaldehyde Bis(hydrazone) Ligand. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201301536] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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118
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Chang KC, Minami T, Koutnik P, Savechenkov PY, Liu Y, Anzenbacher P. Anion Binding Modes in meso-Substituted Hexapyrrolic Calix[4]pyrrole Isomers. J Am Chem Soc 2014; 136:1520-5. [DOI: 10.1021/ja411391c] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Kai-Chi Chang
- Department of Chemistry and
Center for Photochemical Sciences, Bowling Green State University, Bowling
Green, Ohio 43403, United States
| | - Tsuyoshi Minami
- Department of Chemistry and
Center for Photochemical Sciences, Bowling Green State University, Bowling
Green, Ohio 43403, United States
| | - Petr Koutnik
- Department of Chemistry and
Center for Photochemical Sciences, Bowling Green State University, Bowling
Green, Ohio 43403, United States
| | - Pavel Y. Savechenkov
- Department of Chemistry and
Center for Photochemical Sciences, Bowling Green State University, Bowling
Green, Ohio 43403, United States
| | - Yuanli Liu
- Department of Chemistry and
Center for Photochemical Sciences, Bowling Green State University, Bowling
Green, Ohio 43403, United States
| | - Pavel Anzenbacher
- Department of Chemistry and
Center for Photochemical Sciences, Bowling Green State University, Bowling
Green, Ohio 43403, United States
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119
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Rahanyan N, Duttwyler S, Linden A, Baldridge KK, Siegel JS. Cu(i) and Ag(i) complexes of 7,10-bis-N-heterocycle-diazafluoranthenes: programmed molecular grids? Dalton Trans 2014; 43:11027-38. [DOI: 10.1039/c4dt01460j] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reactions of 7,10-disubstituted diazafluoranthene derivatives with three different silver(i) salts AgX (X = [PF6]−, [SbF6]−, [CB11HCl11]−) and [Cu(CH3CN)4]PF6 afforded complexes exhibiting five different motifs.
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Affiliation(s)
- Nelli Rahanyan
- Department of Chemistry
- University of Zürich
- 8057 Zürich, Switzerland
| | - Simon Duttwyler
- Department of Chemistry
- University of Zürich
- 8057 Zürich, Switzerland
| | - Anthony Linden
- Department of Chemistry
- University of Zürich
- 8057 Zürich, Switzerland
| | - Kim K. Baldridge
- Department of Chemistry
- University of Zürich
- 8057 Zürich, Switzerland
| | - Jay S. Siegel
- Department of Chemistry
- University of Zürich
- 8057 Zürich, Switzerland
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120
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Sheikh JA, Adhikary A, Konar S. Magnetic refrigeration and slow magnetic relaxation in tetranuclear lanthanide cages (Ln = Gd, Dy) with in situ ligand transformation. NEW J CHEM 2014. [DOI: 10.1039/c4nj00349g] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Three tetranuclear lanthanide cages featuring either hemicubane (1 and 2) or distorted hemicubane (3) like cores are reported. Magnetic studies reveal significant magnetic entropy changes for complex 1 and a slow relaxation of magnetisation for 3.
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Affiliation(s)
| | - Amit Adhikary
- Department of Chemistry
- IISER Bhopal
- Bhopal 462066, India
| | - Sanjit Konar
- Department of Chemistry
- IISER Bhopal
- Bhopal 462066, India
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121
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Abhervé A, Clemente-Juan JM, Clemente-León M, Coronado E, Boonmak J, Youngme S. Tuning the nuclearity of iron(iii) polynuclear clusters by using tetradentate Schiff-base ligands. NEW J CHEM 2014. [DOI: 10.1039/c3nj01516e] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Three novel octanuclear, hexanuclear and tetranuclear complexes of high-spin Fe(iii) ions were obtained by the reaction of the N,N′-bis-(1R-imidazol-4-ylmethylene)-ethane-1,2-diamine ligand (R = H, CH3) and its derivatives with Fe(ClO4)3·6H2O and KSCN.
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Affiliation(s)
- Alexandre Abhervé
- Instituto de Ciencia Molecular (ICMol)
- Universidad de Valencia
- 46980 Paterna, Spain
| | | | - Miguel Clemente-León
- Instituto de Ciencia Molecular (ICMol)
- Universidad de Valencia
- 46980 Paterna, Spain
| | - Eugenio Coronado
- Instituto de Ciencia Molecular (ICMol)
- Universidad de Valencia
- 46980 Paterna, Spain
| | - Jaursup Boonmak
- Materials Chemistry Research Unit
- Department of Chemistry and Center of Excellence for Innovation in Chemistry
- Faculty of Science
- Khon Kaen University
- Khon Kaen 40002, Thailand
| | - Sujittra Youngme
- Materials Chemistry Research Unit
- Department of Chemistry and Center of Excellence for Innovation in Chemistry
- Faculty of Science
- Khon Kaen University
- Khon Kaen 40002, Thailand
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122
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Chen WB, Li ZX, Ouyang ZJ, Lin WN, Yang L, Dong W. Syntheses, supramolecular structures, magnetic and photochromic properties of six lanthanide complexes based on the 5-azotetrazolyl salicylic acid ligand. RSC Adv 2014. [DOI: 10.1039/c4ra09951f] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Six lanthanide complexes based on 5-azotetrazolyl salicylic acid were synthesized and their crystal structures, magnetic and photochromic properties were reported.
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Affiliation(s)
- Wen-Bin Chen
- Analytical and Testing Center
- Guangzhou Key Laboratory for Environmentally Functional Materials and Technology
- Guangzhou University
- Guangzhou 510006, P. R. China
| | - Zhi-Xin Li
- Analytical and Testing Center
- Guangzhou Key Laboratory for Environmentally Functional Materials and Technology
- Guangzhou University
- Guangzhou 510006, P. R. China
| | - Zhi-Jian Ouyang
- Analytical and Testing Center
- Guangzhou Key Laboratory for Environmentally Functional Materials and Technology
- Guangzhou University
- Guangzhou 510006, P. R. China
| | - Wen-Ning Lin
- Analytical and Testing Center
- Guangzhou Key Laboratory for Environmentally Functional Materials and Technology
- Guangzhou University
- Guangzhou 510006, P. R. China
| | - Liu Yang
- Analytical and Testing Center
- Guangzhou Key Laboratory for Environmentally Functional Materials and Technology
- Guangzhou University
- Guangzhou 510006, P. R. China
| | - Wen Dong
- Analytical and Testing Center
- Guangzhou Key Laboratory for Environmentally Functional Materials and Technology
- Guangzhou University
- Guangzhou 510006, P. R. China
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123
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Adhikary A, Sheikh JA, Konar AD, Konar S. Synthesis, crystal structure, magnetic study and magneto-structural correlation of three Cu(ii) complexes formed via pyridine bis(hydrazone) based ligand. RSC Adv 2014. [DOI: 10.1039/c3ra45928d] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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124
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Mosquera J, Zarra S, Nitschke JR. Aqueous Anion Receptors through Reduction of Subcomponent Self-Assembled Structures. Angew Chem Int Ed Engl 2013; 53:1556-9. [DOI: 10.1002/anie.201308117] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2013] [Revised: 10/31/2013] [Indexed: 12/28/2022]
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125
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Mosquera J, Zarra S, Nitschke JR. Aqueous Anion Receptors through Reduction of Subcomponent Self-Assembled Structures. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201308117] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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126
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Ramsay WJ, Ronson TK, Clegg JK, Nitschke JR. Bidirectional Regulation of Halide Binding in a Heterometallic Supramolecular Cube. Angew Chem Int Ed Engl 2013; 52:13439-43. [DOI: 10.1002/anie.201307478] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2013] [Indexed: 01/07/2023]
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127
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Ramsay WJ, Ronson TK, Clegg JK, Nitschke JR. Bidirectional Regulation of Halide Binding in a Heterometallic Supramolecular Cube. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201307478] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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128
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Bauzá A, Quiñonero D, Deyà PM, Frontera A. On the importance of anion-π interactions in the mechanism of sulfide:quinone oxidoreductase. Chem Asian J 2013; 8:2708-13. [PMID: 23907989 DOI: 10.1002/asia.201300786] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2013] [Indexed: 12/26/2022]
Abstract
Sulfide:quinone oxidoreductase (SQR) is a flavin-dependent enzyme that plays a physiological role in two important processes. First, it is responsible for sulfide detoxification by oxidizing sulfide ions (S(2-) and HS(-)) to elementary sulfur and the electrons are first transferred to flavin adenine dinucleotide (FAD), which in turn passes them to the quinone pool in the membrane. Second, in sulfidotrophic bacteria, SQRs play a key role in the sulfide-dependent respiration and anaerobic photosynthesis, deriving energy for their growth from reduced sulfur. Two mechanisms of action for SQR have been proposed: first, nucleophilic attack of a Cys residue on the C4 of FAD, and second, an alternate anionic radical mechanism by direct electron transfer from Cys to the isoalloxazine ring of FAD. Both mechanisms involve a common anionic intermediate that it is stabilized by a relevant anion-π interaction and its previous formation (from HS(-) and Cys-S-S-Cys) is also facilitated by reducing the transition-state barrier, owing to an interaction that involves the π system of FAD. By analyzing the X-ray structures of SQRs available in the Protein Data Bank (PDB) and using DFT calculations, we demonstrate the relevance of the anion-π interaction in the enzymatic mechanism.
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Affiliation(s)
- Antonio Bauzá
- Department of Chemistry, Universitat de les Illes Balears, Crta. de Valldemossa km 7.5, 07122 Palma de Mallorca (Spain), Fax: (+34) 971-173498
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129
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Abstract
The study of the noncovalent force between π-acidic aromatic systems and anions, referred to as the anion-π interaction, has recently emerged as a new branch of supramolecular chemistry. The anion-π contact is complementary to the cation-π interaction, a prominent noncovalent force involved in protein structure and enzyme function. Until recently, the scientific community had overlooked the anion-π interaction due to its ostensibly counterintuitive nature. Pioneering theoretical studies in 2002, however, established that anion-π interactions are energetically favorable (~20-70 kJ/mol) and prompted a flurry of reports in support of their existence. The interest in anion-π contacts was further fueled by the importance of anions in key chemical and biological processes and the involvement of π-rings in anion recognition and transport. Anion-π interactions hold great promise for the design of selective anion receptors, hosts or scaffolds, colorimetric sensors, and catalysts and may also affect biological functions. Currently, the area of anion-π research is highly topical in the scientific community and on a meteoric rise in the chemical literature. This Account highlights our leading findings in this burgeoning area. Our work has focused on comprehensive investigations of several unprecedented supramolecular systems, in which the anions and their close anion-π contacts are the driving elements of the final architectures. We surveyed several heterocyclic π-acidic aromatic systems amenable to anion-π contacts and explored the subtle interplay between ligand π-acidity, anion identity, and metal ions in mediating the ensuing self-assembled architectures. The reactions we performed between solvated first-row transition metal ions and the π-acidic ligands bptz (3,6-bis(2-pyridyl)-1,2,4,5-tetrazine) or bmtz (3,6-bis(2-pyrimidyl)-1,2,4,5-tetrazine) resulted in unprecedented metallacycles. Our investigations revealed that the identity of the encapsulated ion dictates the metallacycle nuclearity and close anion-π contacts are critical for the metallacycle stability. Our X-ray crystallographic, NMR spectroscopic, and mass spectrometric (MS) studies demonstrated that the tetrahedral ([BF4](-), [ClO4](-)) and octahedral ([SbF6](-), [AsF6](-), [PF6](-)) anions template discrete molecular squares and pentagons, respectively. The metal ions occupy the vertices, and bptz or bmtz moieties span the edges of the metallacycles. The encapsulated anions occupy the π-acidic cavities of the metallacycles and establish multiple close directional F/O···C(tetrazine) contacts with the edges. The observation of notable (19)F solid-state NMR chemical shifts reflects the short contacts of the encapsulated anions, findings that we corroborated by DFT calculations. The solution NMR data support the conclusion that bona fide metallacycle templation and interconversion between the metallacycles in solution occurs only in the presence of the appropriate anions. The NMR, MS, and CV data underscore the remarkable metallapentacycle stability despite the angle strain inherent in pentagons formed by octahedral metal ions. The low anion activation energies of encapsulation (ΔG(‡) ~ 50 kJ/mol) suggest that anion-π contacts assist the anion templation. We also studied reactions of Ag(I)X (X(-) = [PF6](-), [AsF6](-), [SbF6](-), [BF4](-)) with bptz or bppn (3,6-bis(2-pyridyl)-1,2-pyridazine) to assess the effect of the ligand π-acidity on the preferred structures. The X-ray data revealed that the higher π-acidity of the tetrazine ring in bptz leads to propeller-type products [Ag2(bptz)3](2+) exhibiting prominent short anion-π contacts. By contrast, the less π-acidic bppn preferentially favors grids [Ag4(bppn)4](4+) which exhibit maximized π-π interactions. Finally, we explored the reactions of the extended π-acidic heterocycle HAT(CN)6 (1,4,5,8,9,12-hexaazatriphenylene-hexacarbonitrile) with the Cl(-), Br(-), I(-) ions which lead to highly colored solutions/crystals. X-ray crystallographic studies of the HAT(CN)6/halide complexes revealed unprecedented multisite short peripheral charge-transfer and centroid anion-π contacts. In solution, the charge-transfer contacts were evidenced by electronic absorption, (13)C and halogen NMR, as well as MS data. The distinctly colored complex entities exhibit extraordinarily high association constants, which render them promising for anion-sensing receptor applications.
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Affiliation(s)
- Helen T. Chifotides
- Department of Chemistry, Texas A&M University, PO Box 30012, College Station, Texas 77842, United States
| | - Kim R. Dunbar
- Department of Chemistry, Texas A&M University, PO Box 30012, College Station, Texas 77842, United States
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Goodson FS, Panda DK, Ray S, Mitra A, Guha S, Saha S. Tunable electronic interactions between anions and perylenediimide. Org Biomol Chem 2013; 11:4797-803. [DOI: 10.1039/c3ob40703a] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Mitra A, Hubley CT, Panda DK, Clark RJ, Saha S. Anion-directed assembly of a non-interpenetrated square-grid metal–organic framework with nanoscale porosity. Chem Commun (Camb) 2013; 49:6629-31. [DOI: 10.1039/c3cc43178a] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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