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Narang S, Singh UP, Venugopalan P. Solvent-mediated supramolecular templated assembly of a metal organophosphonate via a crystal–amorphous–crystal transformation. CrystEngComm 2016. [DOI: 10.1039/c5ce01594d] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Three monophosphonoester-based supramolecular assemblies were synthesized and fully characterized. These complexes showed a reversible crystal–amorphous–crystal transformation with changes in their emission properties.
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Affiliation(s)
- Shikha Narang
- Department of Chemistry
- Indian Institute of Technology Roorkee
- Roorkee – 247 667, India
| | - Udai P. Singh
- Department of Chemistry
- Indian Institute of Technology Roorkee
- Roorkee – 247 667, India
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2
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Singh SK, Rajaraman G. Can anisotropic exchange be reliably calculated using density functional methods? A case study on trinuclear Mn(III)-M(III)-Mn(III) (M=Fe, Ru, and Os) cyanometalate single-molecule magnets. Chemistry 2013; 20:113-23. [PMID: 24288194 DOI: 10.1002/chem.201303489] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2013] [Indexed: 11/05/2022]
Abstract
Density functional studies have been performed on a set of trinuclear single-molecule magnets (SMMs) of general formula [{Mn2(5-Br salen)2(MeOH)2}M(CN)6](NEt4) (M=Fe(III) (1), Ru(III) (2) and Os(III) (3); 5-Brsalen=N,N'-ethylenebis(5-bromosalicylidene)iminato anion). We have computed the orbital-dependent exchange interaction for all three complexes for the first time using DFT and complete active space self-consistent field (CASSCF) methods. DFT calculations yield the anisotropic exchange as J(ξξ)=3.5 cm(-1) for 1; J(ξξ)=12.1 cm(-1), J(ζζ)=-6.9 cm(-1) and J(ηη)=-14 cm(-1) for 2; and J(ξξ)=23.7 cm(-1) and J(ζζ) =-11.1 cm(-1) for 3. The computed values are in agreement with the experimental report, and this suggests that the established methodology can be used to compute the anisotropic exchange in larger clusters. Our calculations reiterate the fact that the exchange is described by a three-axis anisotropic exchange for complexes 2 and 3 as evidenced by the experiments. A stronger exchange coupling as we move down the periodic table from 3d to 5d is reproduced by our calculations, and the origin of this enhancement in the exchange interaction has been probed by using molecular orbital analysis. The electronic origin of different types of exchange observed in this series is found to be related to the energy difference between possible degenerate pairs and the nature of orbital interactions. By computing the exchange interaction, the single-ion anisotropy of Mn(III) and zero-field splitting of the S=9/2 ground state of complexes 1-3 using CASSCF and/or DFT methods, we have attempted to shed light on the issue of anisotropic exchange and the barrier height for the magnetisation reversal in SMMs. Comprehensive magneto-structural correlations have been developed to offer clues on how to further enhance the barrier height in this class of SMMs.
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Affiliation(s)
- Saurabh Kumar Singh
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076 (India), Fax: +91-(0)22-2576-7152
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Chandrasekhar V, Goura J, Duthie A. Molecular Indium(III) Phosphonates Possessing Ring and Cage Structures. Synthesis and Structural Characterization of [In2(t-BuPO3H)4(phen)2Cl2] and [In3(C5H9PO3)2(C5H9PO3H)4(phen)3]·NO3·3.5H2O. Inorg Chem 2013; 52:4819-24. [DOI: 10.1021/ic3022485] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Vadapalli Chandrasekhar
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India
- Centre for Interdisciplinary
Sciences, Tata Institute of Fundamental Research, 21 Brundavan Colony, Narsingi, Hyderabad 500075,
India
| | - Joydeb Goura
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Andrew Duthie
- School
of Life and Environmental Sciences, Deakin University, Geelong 3217, Australia
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Zhang L, Clérac R, Onet CI, Venkatesan M, Heijboer P, Schmitt W. Supramolecular Approach by Using Jahn-Teller Sites to Construct a {Mn13}-Based Coordination Polymer and Modify its Magnetic Properties. Chemistry 2012; 18:13984-8. [DOI: 10.1002/chem.201202297] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2012] [Indexed: 11/06/2022]
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Chandrasekhar V, Goura J, Sañudo EC. Carboxylate-Free Manganese(II) Phosphonate Assemblies: Synthesis, Structure, and Magnetism. Inorg Chem 2012; 51:8479-87. [DOI: 10.1021/ic301060j] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Joydeb Goura
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - E. Carolina Sañudo
- Departament de Química
Inorgànica i Institut de Nanociència i Nanotecnologia, Universitat de Barcelona, Diagonal 647,
08028 Barcelona, Spain
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Zhang L, Clérac R, Heijboer P, Schmitt W. Influencing the Symmetry of High-Nuclearity and High-Spin Manganese Oxo Clusters: Supramolecular Approaches to Manganese-Based Keplerates and Chiral Solids. Angew Chem Int Ed Engl 2012; 51:3007-11. [DOI: 10.1002/anie.201107358] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2011] [Revised: 12/07/2011] [Indexed: 11/08/2022]
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Zhang L, Clérac R, Heijboer P, Schmitt W. Symmetrievarianten bei vielkernigen Mangan-Oxo-Clustern mit hohem Spinzustand: supramolekulare Synthese von Kepleraten und chiralen Festkörpern auf Mangan-Basis. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201107358] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Taylor JM, Mahmoudkhani AH, Shimizu GKH. A tetrahedral organophosphonate as a linker for a microporous copper framework. Angew Chem Int Ed Engl 2009; 46:795-8. [PMID: 17163558 DOI: 10.1002/anie.200604034] [Citation(s) in RCA: 110] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Jared M Taylor
- Department of Chemistry, University of Calgary, Calgary, AB T2N 1N4, Canada
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Murugavel R, Gogoi N, Suresh K, Layek S, Verma H. Nuclearity Control in Molecular Iron Phosphates through Choice of Iron Precursors and Ancillary Ligands. Chem Asian J 2009; 4:923-935. [DOI: 10.1002/asia.200800474] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Murugavel R, Kuppuswamy S, Gogoi N, Steiner A, Bacsa J, Boomishankar R, Suresh K. Controlling the Structure of Manganese(II) Phosphates by the Choice and Ratio of Organophosphate and Auxiliary Ligands. Chem Asian J 2008; 4:143-53. [DOI: 10.1002/asia.200800317] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Wang Y, Cheng P, Song Y, Liao DZ, Yan SP. Self-Assembly and Anion-Exchange Properties of a Discrete Cage and 3D Coordination Networks Based on Cage Structures. Chemistry 2007; 13:8131-8. [PMID: 17614306 DOI: 10.1002/chem.200700431] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
By using tridentate ligand 4-(3-pyridinyl)-1,2,4-triazole (pytrz), cage-like complexes of {[Cu(mu2-pytrz)2](ClO4)(SO4)0.5C2H5OH.0.25 H2O}6 (1), {[Cu3(mu3-pytrz)4(mu2-Cl)2(H2O)2](ClO4)2Cl(2).2 H2O}n (2), and {[Cu3(mu3-pytrz)3(mu3-O)(H2O)3](ClO4)2.5(BF4)(1.5)5.25 H2O}n (3) have been synthesized with different copper(II) salts. Complex 1 represents the second example of a M6L12 metal-organic octahedron with an overall Th symmetry. Complex 2 is constructed from a 3(8) cage-building unit (CBU) and each CBU connects six neighboring cages to give the first 3D metal-organic framework (MOF) based on octahedral M6L12. Complex 3 is built from Cu24(pytrz)12 CBUs with the trinuclear copper clusters serving as second building units (SBUs) and decorating each corner of the M24L12 polyhedron. The Cu24(pytrz)12 building unit is linked by extra ligands to give an extended 3D framework that has the formula Cu24(pytrz)24 and possesses a CaB6 topology. The mixed anions ClO4- and BF4- in 3 are both included in the inner cavity of the cage and can be completely exchanged by ClO4- through the open windows of the cage, as evidenced by the crystal structure of the 3D MOF {[Cu3(mu3-pytrz)3(mu3-O)(H2O)3](ClO4)(4)4.5 H2O}n (4). Complex 4 can also be synthesized when employing 1 as a precursor in an extensive study of the anion-exchange reaction. This represents the first successful conversion of a discrete cage into a 3D coordination network based on a cage structure. Complex 2 remains invariable during anion-exchange reactions because uncoordinated Cl- ions are located in the comparatively small inner cavity.
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Affiliation(s)
- Ying Wang
- Department of Chemistry, Nankai University, Tianjin 300071, China
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Khanra S, Kloth M, Mansaray H, Muryn CA, Tuna F, Sañudo EC, Helliwell M, McInnes EJL, Winpenny REP. Synthesis of Molecular Vanadium(III) Phosphonates. Angew Chem Int Ed Engl 2007; 46:5568-71. [PMID: 17577911 DOI: 10.1002/anie.200701115] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Sumit Khanra
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, UK
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Khanra S, Kloth M, Mansaray H, Muryn C, Tuna F, Sañudo E, Helliwell M, McInnes E, Winpenny R. Synthesis of Molecular Vanadium(III) Phosphonates. Angew Chem Int Ed Engl 2007. [DOI: 10.1002/ange.200701115] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Taylor J, Mahmoudkhani A, Shimizu G. A Tetrahedral Organophosphonate as a Linker for a Microporous Copper Framework. Angew Chem Int Ed Engl 2007. [DOI: 10.1002/ange.200604034] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Wu J, Song Y, Zhang E, Hou H, Fan Y, Zhu Y. Studies on Cage-Type Tetranuclear Metal Clusters with Ferrocenylphosphonate Ligands. Chemistry 2006; 12:5823-31. [PMID: 16721869 DOI: 10.1002/chem.200500905] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Reaction of FcCH(2)PO(3)H(2) [Fc=(eta(5)-C(5)H(5))Fe(eta(5)-C(5)H(4))] (H(2)FMPA) and 1,10-phenanthroline (phen) with Cd(OAc)(2).2 H(2)O or ZnSO(4).7 H(2)O in methanol in the presence of triethylamine resulted in the formation of two new ferrocenylphosphonate metal-cage complexes [M(4)(fmpa)(4)(phen)(4)] 7 CH(3)OH (M=Cd 1, M=Zn 2). Both structures contain two kinds of isomeric tetranuclear metal phosphonate cages, which are linked to one another by pi-pi interactions between the phen molecules. In 1, the Cd1, Cd3, and Cd4 atoms are all pentacoordinate, while the Cd2 atom is coordinated by four oxygen atoms from three phosphonate ligands and two nitrogen atoms from the chelating phen in a distorted octahedral geometry. Four Cd atoms from each unit are interconnected through bridging phosphonate ligands with different coordination modes, such as 5.221, 4.211, and 2.11 (Harris notation), yielding a {Cd(4)} cage. In 2, each Zn atom is coordinated by three oxygen atoms from three phosphonate ligands and two nitrogen atoms from phen, leading to a distorted square-pyramidal geometry. The four Zn atoms of each isomeric unit are also interconnected through four bridging phosphonate ligands to yield a {Zn(4)} cage. Fluorescent studies indicate that ligand-to-ligand charge-transfer photoluminescence is observed for 1, while the emission bands of 2 can be assigned to an admixture of ligand-to-ligand and metal-to-ligand charge transfer. Solution-state differential pulse voltammetry indicates that the half-wave potentials of the ferrocenyl moieties in 1 and 2 have different deviations relative to the relevant H(2)FMPA ligand. This may be because the highest occupied molecular orbital (HOMO) in 1 is located in the FMPA(2-) groups, while in 2 the HOMO is located in the phen and Zn(II) groups, so the Fe(II) centers in complex 1 are more easily oxidized to Fe(III) centers than those of 2. The third-order nonlinear optical (NLO) measurements show that both 1 and 2 exhibit strong third-order NLO self-focusing effects; hence, they are promising candidates for NLO materials. By calculating the component of the lowest unoccupied molecular orbitals of 1 and 2, we confirmed that the co-planar phen rings control their optical nonlinearity, while the H(2)FMPA ligands and metal ions have only a weak influence on their NLO properties.
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Affiliation(s)
- Jie Wu
- Department of Chemistry, Zhengzhou University, Zhengzhou, 450052, China
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Livage C, Guillou N, Chaigneau J, Rabu P, Drillon M, Férey G. A Three-Dimensional Metal-Organic Framework with an Unprecedented Octahedral Building Unit. Angew Chem Int Ed Engl 2005; 44:6488-91. [PMID: 16163757 DOI: 10.1002/anie.200502185] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Carine Livage
- Institut Lavoisier, UMR-CNRS 8637, Université de Versailles Saint-Quentin-en-Yvelines, 45 avenue des Etats-Unis, 78035 Versailles Cedex, France.
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Livage C, Guillou N, Chaigneau J, Rabu P, Drillon M, Férey G. A Three-Dimensional Metal-Organic Framework with an Unprecedented Octahedral Building Unit. Angew Chem Int Ed Engl 2005. [DOI: 10.1002/ange.200502185] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Murugavel R, Davis P, Walawalkar MG. First Examples of Metal Cyclohexylphosphonates: Influence of the Choice of Synthetic Route on the Product. Z Anorg Allg Chem 2005. [DOI: 10.1002/zaac.200500156] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Anantharaman G, Chandrasekhar V, Walawalkar MG, Roesky HW, Vidovic D, Magull J, Noltemeyer M. Molecular zinc phosphonates: synthesis and X-ray crystal structures of [{(ZnMe)4(THF)2}{tBuPO3}2] and [{(ZnEt)3(Zn(THF))3}{tBuPO3}4{μ3-OEt}]. Dalton Trans 2004:1271-5. [PMID: 15252672 DOI: 10.1039/b400168k] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reactions of zinc alkyls with tert-butylphosphonic acid in 2 : 1 and 1 : 1 molar ratios afforded [[(ZnMe)(4-)(THF)2][tBuPO3]2] (2) and [[(ZnEt)3(Zn(THF))3][tBuPO3]4[mu3-OEt]] (3), respectively. Compounds 2 and 3 have been fully characterised by means of spectroscopic and analytical methods. Single-crystal X-ray diffraction studies revealed that zinc phosphonates 2 and 3 are tetra- and hexa-nuclear, respectively. This is in contrast to the dodecanuclear zinc phosphonate [[Zn2(THF)2(ZnEt)6Zn4(mu4-O)][(tBuPO3)8]] (1) obtained in a 1.5 : 1 reaction between zinc alkyls and tBuP(O)(OH)2.
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Affiliation(s)
- Ganapathi Anantharaman
- Institut fur Anorganische Chemie der Universitat Gottingen, Tammannstrasse 4, D-37077 Gottingen, Germany
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