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Hybrid Molecular Compound Exhibiting Slow Magnetic Relaxation and Electrical Conductivity. MAGNETOCHEMISTRY 2016. [DOI: 10.3390/magnetochemistry2040044] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Venneri S, Wilson J, Rawson JM, Pilkington M. Structural, Magnetic and DFT studies on a Charge-Transfer Salt of a Tetrathiafulvalenepyridyl-(1,5-diisopropyl) verdazyl Diradical Cation. Chempluschem 2015; 80:1624-1633. [PMID: 31973366 DOI: 10.1002/cplu.201500309] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2015] [Indexed: 11/05/2022]
Abstract
A new tetrathiafulvalene (TTF) donor covalently appended with a 1,5-diisopropylverdazyl radical through a cross-conjugated pyridyl linker (3) has been prepared and characterised. Reaction of 3 with tetracyanoquinonedimethane (TCNQ) afforded the 2:1 charge-transfer complex (3)2 ⋅TCNQ (4), in which the IR and structural data are consistent with 0.25 e- charge transfer from the TTF donor (D) to the TCNQ acceptor (A). The TTF and TCNQ molecules adopt a mixed-stack D⋅⋅⋅D⋅⋅⋅A arrangement that does not facilitate conduction. A solution EPR spectrum of 4 comprises a broad featureless singlet, which is consistent with the presence of a TCNQ radical anion. Theoretical studies were performed to probe the exchange interactions within selected fragments of 4 with and without charge transfer. In the absence of charge transfer, DFT calculations reveal weak antiferromagnetic exchange between verdazyl radicals within the (3)2 monoradical unit. However, partial oxidation of the dimer (3)2 to the diradical cation leads to an S= 1 / 2 ground state, in which the verdazyl radical spins are now aligned co-parallel as a consequence of antiferromagnetic exchange to the additional delocalised TTF-based spin containing unit. The magnetic properties of 4 are consistent with a net S= 1 / 2 spin state per formula unit with dominant antiferromagnetic interactions between spin-bearing building blocks.
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Affiliation(s)
- Shari Venneri
- Department of Chemistry, Brock University, 500 Glenridge Ave, St. Catharines, ON, L2S 3A1, Canada
| | - Justin Wilson
- Department of Chemistry, Brock University, 500 Glenridge Ave, St. Catharines, ON, L2S 3A1, Canada
| | - Jeremy M Rawson
- Department of Chemistry & Biochemistry, The University of Windsor, 401 Sunset Avenue, Windsor, ON, N9B 3P4, Canada
| | - Melanie Pilkington
- Department of Chemistry, Brock University, 500 Glenridge Ave, St. Catharines, ON, L2S 3A1, Canada
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Atzori M, Pop F, Auban-Senzier P, Gómez-García CJ, Canadell E, Artizzu F, Serpe A, Deplano P, Avarvari N, Mercuri ML. Structural Diversity and Physical Properties of Paramagnetic Molecular Conductors Based on Bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF) and the Tris(chloranilato)ferrate(III) Complex. Inorg Chem 2014; 53:7028-39. [DOI: 10.1021/ic501001r] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Matteo Atzori
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, S.S. 554 − Bivio per Sestu − I09042 Monserrato, Cagliari, Italy
- Laboratoire MOLTECH-Anjou
UMR 6200, UFR Sciences, CNRS, Université d’Angers, Bât.
K, 2 Bd. Lavoisier, 49045 Angers, France
| | - Flavia Pop
- Laboratoire MOLTECH-Anjou
UMR 6200, UFR Sciences, CNRS, Université d’Angers, Bât.
K, 2 Bd. Lavoisier, 49045 Angers, France
| | - Pascale Auban-Senzier
- Laboratoire de Physique
des Solides, UMR 8502, Université Paris-Sud, Bât.
510, 91405 Orsay, France
| | - Carlos J. Gómez-García
- Instituto de Ciencia Molecular (ICMol),
Parque Científico, Universidad de Valencia, C/Catedrático
José Beltrán, 2, 46980 Paterna, Spain
| | - Enric Canadell
- Institut de Ciència de Materials de Barcelona (CSIC), Campus de la UAB, E-08193 Bellaterra, Spain
| | - Flavia Artizzu
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, S.S. 554 − Bivio per Sestu − I09042 Monserrato, Cagliari, Italy
| | - Angela Serpe
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, S.S. 554 − Bivio per Sestu − I09042 Monserrato, Cagliari, Italy
| | - Paola Deplano
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, S.S. 554 − Bivio per Sestu − I09042 Monserrato, Cagliari, Italy
| | - Narcis Avarvari
- Laboratoire MOLTECH-Anjou
UMR 6200, UFR Sciences, CNRS, Université d’Angers, Bât.
K, 2 Bd. Lavoisier, 49045 Angers, France
| | - Maria Laura Mercuri
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, S.S. 554 − Bivio per Sestu − I09042 Monserrato, Cagliari, Italy
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Landee CP, Turnbull MM. Recent Developments in Low-Dimensional Copper(II) Molecular Magnets. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201300133] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Pilia L, Sessini E, Artizzu F, Yamashita M, Serpe A, Kubo K, Ito H, Tanaka H, Kuroda SI, Yamada JI, Deplano P, Gómez-García CJ, Mercuri ML. New BDH-TTP/[MIII(C5O5)3]3– (M = Fe, Ga) Isostructural Molecular Metals. Inorg Chem 2012; 52:423-30. [DOI: 10.1021/ic302234j] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Luca Pilia
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, S.S. 554 − Bivio per Sestu, I09042 Monserrato (Cagliari),
Italy
- EaStChem
and School of Chemistry, University of Edinburgh, King’s Buildings, West Mains Road, Edinburgh EH9 3JJ, United
Kingdom
| | - Elisa Sessini
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, S.S. 554 − Bivio per Sestu, I09042 Monserrato (Cagliari),
Italy
| | - Flavia Artizzu
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, S.S. 554 − Bivio per Sestu, I09042 Monserrato (Cagliari),
Italy
| | | | - Angela Serpe
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, S.S. 554 − Bivio per Sestu, I09042 Monserrato (Cagliari),
Italy
| | - Kazuya Kubo
- Department
of Chemistry, Tohoku University, Sendai 980-8578, Japan
| | - Hiroshi Ito
- Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
| | - Hisaaki Tanaka
- Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
| | - Shin-ichi Kuroda
- Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
| | - Jun-ichi Yamada
- Department of Material
Science, University of Hyogo, 3-2-1 Kouto, Kamigori-cho, Ako-gun, Hyogo 678-1297, Japan
| | - Paola Deplano
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, S.S. 554 − Bivio per Sestu, I09042 Monserrato (Cagliari),
Italy
| | - Carlos J. Gómez-García
- Instituto de Ciencia
Molecular (ICMol), Parque Científico, Universidad de Valencia, C/Catedrático José
Beltrán, 2, 46980 Paterna (Valencia), Spain
| | - Maria Laura Mercuri
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, S.S. 554 − Bivio per Sestu, I09042 Monserrato (Cagliari),
Italy
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TAKAHATA MASAHIRO, NAKANO MASAYOSHI, YAMAGUCHI KIZASHI. EXCITON MIGRATION IN DENDRITIC AGGREGATE SYSTEMS USING THE QUANTUM MASTER EQUATION APPROACH INVOLVING WEAK EXCITON-PHONON COUPLING. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2011. [DOI: 10.1142/s0219633603000598] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The quantum master equation approach involving a weak exciton-phonon coupling is applied to the exciton migration dynamics of dendritic molecular aggregates modeled after a phenylacetylene dendrimer, D25, which exhibits an efficient light-harvesting property. The mechanism of efficient exciton migration from the periphery to the core is studied by analyzing relaxation terms among the exciton states originating in weak exciton-phonon coupling. Partial overlaps of exciton distributions between neighboring exciton states are found to be important for realizing the unique migration behavior by step-by-step transfer from the periphery to the core via multi-step exciton states. The same calculation method is applied to the exciton dynamics of a larger dendritic aggregate model, D127, modeled after the largest synthesized phenylacetylene dendrimer D127 in order to examine the dependencies of the exciton migration on the strength of the intermolecular interaction and the temperature of phonon bath. In the case of the relatively weak dipole-dipole coupling, exciton is not observed to migrate efficiently from the periphery to the core, while the largest exciton population is found to remain in the intermediate generations. This is ascribed to the fact that the thermal excitation to the higher exciton states significantly contributes to the exciton distribution in the equilibrium state when the weak intermolecular interaction reduces the energy difference between exciton states. This indicates that the intermolecular interaction is important not only for the overlaps of the exciton distributions between the exciton states, but also the relation between the exciton energy differences and thermal excitations, which spoil the distinct concentration of exciton distribution in the core generation. In the case of a low temperature, even if the intermolecular interaction is weak, the exciton population in the core region is found to be the largest in all the generations. This suggests that exciton tends to efficiently migrate from the periphery to the core when the temperature is sufficiently low. Implications of these theoretical results are discussed in relation to design of magneto-optical materials and other technological applications.
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Affiliation(s)
- MASAHIRO TAKAHATA
- Department of Chemistry, Graduate School of Science, Osaka University, Machikaneyama 1-1, Toyonaka, Osaka 560-0043, Japan
| | - MASAYOSHI NAKANO
- Division of Chemical Engineering, Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
| | - KIZASHI YAMAGUCHI
- Department of Chemistry, Graduate School of Science, Osaka University, Machikaneyama 1-1, Toyonaka, Osaka 560-0043, Japan
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Kitagawa Y, Nakanishi Y, Kataoka Y, Saito T, Yasuda N, Kawakami T, Yamanaka S, Okumura M, Yamaguchi K. Theoretical study of intra- and inter-chain magnetic interactions in [Ni(chxn)2Br]Br2. Polyhedron 2011. [DOI: 10.1016/j.poly.2011.03.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Saito T, Yasuda N, Nishihara S, Yamanaka S, Kitagawa Y, Kawakami T, Okumura M, Yamaguchi K. Broken-symmetry natural orbital (BSNO)–Mk-MRCC study on the exchange coupling in the binuclear copper(II) compounds. Chem Phys Lett 2011. [DOI: 10.1016/j.cplett.2011.02.018] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Mitsumi M, Yoshida Y, Kohyama A, Kitagawa Y, Ozawa Y, Kobayashi M, Toriumi K, Tadokoro M, Ikeda N, Okumura M, Kurmoo M. Syntheses, Structures and Solid-State Properties of MMX Mixed-Valence Chains, [NiII/III2(RCS2)4I]∞ (R = Et, n-Pr and n-Bu): Evidence of a Spin-Peierls Transition. Inorg Chem 2009; 48:6680-91. [DOI: 10.1021/ic900630a] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Minoru Mitsumi
- Department of Material Science, Graduate School of Material Science, University of Hyogo, 3-2-1 Kouto, Kamigori-cho, Ako-gun, Hyogo 678-1297, Japan
| | - Yuji Yoshida
- Department of Material Science, Graduate School of Material Science, University of Hyogo, 3-2-1 Kouto, Kamigori-cho, Ako-gun, Hyogo 678-1297, Japan
| | - Akihisa Kohyama
- Department of Material Science, Graduate School of Material Science, University of Hyogo, 3-2-1 Kouto, Kamigori-cho, Ako-gun, Hyogo 678-1297, Japan
| | - Yasutaka Kitagawa
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
| | - Yoshiki Ozawa
- Department of Material Science, Graduate School of Material Science, University of Hyogo, 3-2-1 Kouto, Kamigori-cho, Ako-gun, Hyogo 678-1297, Japan
| | - Mototada Kobayashi
- Department of Material Science, Graduate School of Material Science, University of Hyogo, 3-2-1 Kouto, Kamigori-cho, Ako-gun, Hyogo 678-1297, Japan
| | - Koshiro Toriumi
- Department of Material Science, Graduate School of Material Science, University of Hyogo, 3-2-1 Kouto, Kamigori-cho, Ako-gun, Hyogo 678-1297, Japan
| | - Makoto Tadokoro
- Department of Chemistry, Graduate School of Science, Osaka City University, 3-3-138, Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Naoshi Ikeda
- Japan Synchrotron Radiation Research Institute,1-1 Kouto, Mikazuki-cho, Sayo-gun, Hyogo 679-5198, Japan
| | - Mitsutaka Okumura
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
| | - Mohamedally Kurmoo
- Laboratoire de Chimie de Coordination Organique, CNRS-UMR 7140, Université de Strasbourg, 4 rue Blaise Pascal, F-67000 Strasbourg, France
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A theoretical study of H(S2N2)YH (Y=1, 2, 3, 4, 5): Modeling the superconducting polymer (SN)X. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/j.theochem.2008.01.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Coronado E, Curreli S, Giménez-Saiz C, Gómez-García CJ, Deplano P, Mercuri ML, Serpe A, Pilia L, Faulmann C, Canadell E. New BEDT-TTF/[Fe(C5O5)3]3- Hybrid System: Synthesis, Crystal Structure, and Physical Properties of a Chirality-Induced α Phase and a Novel Magnetic Molecular Metal. Inorg Chem 2007; 46:4446-57. [PMID: 17465539 DOI: 10.1021/ic062152m] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The paramagnetic and chiral anion [Fe(C5O5)3]3- (C5O52-=croconate) has been combined with the organic donor BEDT-TTF (=ET=bis(ethylenedithio)tetrathiafulvalene) to synthesize a novel paramagnetic semiconductor with the first chirality-induced alpha phase, alpha-(BEDT-TTF)5[Fe(C5O5)3].5H2O (1), and one of the few known paramagnetic molecular metals, beta-(BEDT-TTF)5[Fe(C5O5)3].C6H5CN (2). Both compounds present layers of BEDT-TTF molecules, with the alpha or beta packing modes, alternating with layers containing the high-spin S=5/2 Fe(III) anions and solvent molecules. In the alpha phase, the alternation of the chiral [Fe(C5O5)3]3- anions along the direction perpendicular to the BEDT-TTF chains induces an alternation of the tilt angle of the BEDT-TTF molecules, giving rise to the observed alpha phase. The alpha phase presents a semiconductor behavior with a high room-temperature conductivity (6 S.cm-1) and an activation energy of 116 meV. The beta phase presents a metallic behavior down to ca. 120 K, where a charge localization takes place with a reentrance to the metallic state below ca. 20 K followed by a metal-semiconductor transition at ca. 10 K. The magnetic properties are dominated by the paramagnetic S=5/2 [Fe(C5O5)3]3- anion with an extra Pauli-type paramagnetism in the metallic beta phase. The ESR spectra confirm the presence of the high-spin Fe(III)-containing anion and show a progressive localization in the organic sublattice along with an antiferromagnetic coupling below ca. 120 K that, in the metallic beta phase, could be at the origin of the transition from the metallic to the activated conductivity regime. The correlation between crystal structure and conductivity behavior has been studied by means of tight-binding band structure calculations which provide a rationalization of the charge distribution and conductivity results.
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Affiliation(s)
- Eugenio Coronado
- Instituto de Ciencia Molecular, Universidad de Valencia, Pol. La Coma, E-46980 Paterna, Spain
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Yoshida Y, Otsuka A, Saito G, Natsume S, Nishibori E, Takata M, Sakata M, Takahashi M, Yoko T. Conducting and Magnetic Properties of 1-Ethyl-3-methylimidazolium (EMI) Salts Containing Paramagnetic Irons: Liquids [EMI][MIIICl4] (M = Fe and Fe0.5Ga0.5) and Solid [EMI]2[FeIICl4]. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2005. [DOI: 10.1246/bcsj.78.1921] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Yamaguchi K, Kawakami T, Taniguchi T, Nakano S, Kitagawa Y, Nagao H, Ohsaku T, Takeda R. Theoretical studies of molecule-based magnetic conductors. Polyhedron 2003. [DOI: 10.1016/s0277-5387(03)00295-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Takamizawa S, Hiroki T, Nakata EI, Mochizuki K, Mori W. Crystal Structure and Gas Adsorption Property of Rhodium(II) Benzoate Pyrazine. CHEM LETT 2002. [DOI: 10.1246/cl.2002.1208] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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