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Microscopic evidence of a metallic state in the one‐pot organic conductor ammonium tetrathiapentalene carboxylate
Author(s) -
Nakamura Toshikazu,
Furukawa Ko,
Terauchi Takeshi,
Kobayashi Yuka
Publication year - 2015
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201510206
Subject(s) - carboxylate , chemistry , electrical conductor , electron paramagnetic resonance , doping , conductor , laser linewidth , relaxation (psychology) , metal , condensed matter physics , nuclear magnetic resonance , materials science , stereochemistry , organic chemistry , physics , psychology , social psychology , laser , optics , composite material
1 H NMR (nuclear magnetic resonance) and high‐field ESR (electron spin resonance) measurements were carried out for self‐doped organic conductors in the ammonium tetrathiapentalene carboxylate (TTPCOO) 2 [(NH 4 1+ ) 1– x (NH 3 0 ) x ] system. While the pristine TTPCOOH molecule is closed‐shell, self‐doped carriers are generated by substitution of the carboxyl proton by (NH 3 0 ) and (NH 4 1+ ), which can be regarded as a charge reservoir. The π‐extended system TTPCOO has a uniaxial g ‐tensor, indicating a 2D isotropic structure such as a herring‐bone‐like or parallel cross donor arrangement. The NMR‐relaxation rate indicated the Korringa relation in the temperature dependence, and the ESR linewidth followed the Elliot mechanism. Both of these observations provide supporting evidence for a stable metallic state. In this paper, we introduce self‐doped organic conductors as a branch of materials design, and emphasize that advanced magnetic resonance measurements are powerful tools for developing functional materials. (© 2015 WILEY‐VCH Verlag GmbH &Co. KGaA, Weinheim)