Magnetic and Electric Properties of Organic Conductors Probed by 13C-NMR Using Selective-Site Substituted Molecules

Crystals

Shinji Hirose¹  Masaki Misawa¹ 

[1] Department of Condensed Matter Physics, Hokkaido University, Kita-ku Sapporo, Hokkaido 060-0810, Japan;

关键词: ¹³C-NMR;    TMTTF;    TMTSF;    BEDT-TTF;    Pake doublet;    hyperfine coupling tensor;   

DOI  :  10.3390/cryst2031034

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2012 by the authors; licensee MDPI, Basel, Switzerland.