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Magnetic and Electric Properties of Organic Conductors Probed by 13C-NMR Using Selective-Site Substituted Molecules
Department of Condensed Matter Physics, Hokkaido University, Kita-ku Sapporo, Hokkaido 060-0810, Japan
* Author to whom correspondence should be addressed.
Received: 6 April 2012; in revised form: 26 June 2012 / Accepted: 6 July 2012 / Published: 27 July 2012
Abstract: Quasi-One and quasi-two dimensional organic conductors consisting of TTF derivatives such as BEDT-TTF (bis-(ethylene-dithio)-tetra-thia-fulvalene) and TMTCF (C = S; TMTTF: tetra-methyl-tetra-thia-fulvalene, C = Se; TMTSF: tetra-methyl-tetra-selena-fulvalene) have been well investigated in condensed matter physics because of interest in the emerging electric and magnetic properties, such as the spin density wave, charge order, superconductivity, anti-ferromagnetism, and so on. To probe the electronic state, nuclear magnetic resonance (NMR) is one of the most powerful tools as the microscopic magnetometer. A number of 13C-NMR studies have been performed of the double-site central 13C=13C bond substituted molecules. However, problems with the coupled spin system of 13C=13C complicated the interpretation for observations on NMR. Therefore, single-site 13C-enriched molecules are desired. We summarize the problem of Pake doublet and the preparation of the single-site 13C-susbstituted BEDT-TTF and TMTCF molecules. We also demonstrate the superiority of 13C-NMR of the single-site 13C-susbstituted molecule utilizing the hyperfine coupling tensor.
Keywords: 13C-NMR; TMTTF; TMTSF; BEDT-TTF; Pake doublet; hyperfine coupling tensor
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Hirose, S.; Misawa, M.; Kawamoto, A. Magnetic and Electric Properties of Organic Conductors Probed by 13C-NMR Using Selective-Site Substituted Molecules. Crystals 2012, 2, 1034-1057.
Hirose S, Misawa M, Kawamoto A. Magnetic and Electric Properties of Organic Conductors Probed by 13C-NMR Using Selective-Site Substituted Molecules. Crystals. 2012; 2(3):1034-1057.
Hirose, Shinji; Misawa, Masaki; Kawamoto, Atsushi. 2012. "Magnetic and Electric Properties of Organic Conductors Probed by 13C-NMR Using Selective-Site Substituted Molecules." Crystals 2, no. 3: 1034-1057.