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Structural and Electronic Characteristics of a Novel BEDT‐TTF Derivative: [BEDT‐TTF] 2 [Cu 2 Br 3 ]
Author(s) -
Schödel Frauke,
Tutsch Ulrich,
Isselbächer Friedhelm,
Schweitzer Dieter,
Sänger Inge,
Bolte Michael,
Bats Jan W.,
Müller Jens,
Lang Michael,
Wagner Matthias,
Lerner HansWolfram
Publication year - 2011
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201001044
Subject(s) - chemistry , triclinic crystal system , tetrathiafulvalene , crystallography , ion , molecule , crystal structure , stereochemistry , organic chemistry
Crystals of κ‐[(BEDT‐TTF) 2 ][Cu(N(CN) 2 )Br] were available with good quality and high reproducibility from the BEDT‐TTF electro‐oxidation with an electrolyte molar ratio [Ph 4 P][N(CN) 2 ]:CuBr of 1:1 in a mixture of THF and ethylene glycol. Surprisingly, by varying the electrolyte molar ratio from 1:1 to 1:8 a novel type of BEDT‐TTF salt, [BEDT‐TTF] 2 [Cu 2 Br 3 ], was formed. The solid‐state structure of [BEDT‐TTF] 2 [Cu 2 Br 3 ] consists of stacks of non‐coordinated BEDT‐TTF molecules and stacks of the contact ions [BEDT‐TTF][Cu 2 Br 3 ] (triclinic space group, P 1). The two crystallographically independent [BEDT‐TTF][Cu 2 Br 3 ] contact ions in the second stack are related by a pseudo‐inversion center. Resistivity measurements on single crystals reveal that [BEDT‐TTF] 2 [Cu 2 Br 3 ] possesses a semiconductor‐like behavior under normal pressure from room temperature down to at least 10 K.