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Molecular Conductors with Effectively Half‐Filled Electronic States Based on Tetrathiafulvalene Derivatives Condensed with a 2‐Isopropylidene‐1,3‐dithiole Ring
Author(s) -
Furuta Keisuke,
Kohno Shuhei,
Shirahata Takashi,
Misaki Yohji
Publication year - 2014
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.201402006
Subject(s) - tetrathiafulvalene , chemistry , triclinic crystal system , crystallography , dimer , ring (chemistry) , salt (chemistry) , metal , molecule , stereochemistry , crystal structure , organic chemistry
The electron donor 2‐isopropylidene‐1,3‐dithiolo[4,5‐ d ]‐4,5‐ethylenediselenotetrathiafulvalene ( 3 ) provides two new molecular conductors, ( 3 ) 2 [M(CN) 2 ] (M = Ag and Au). These salts crystallize in the triclinic P $\bar {1}$ space group. The donor sheet structure of these salts is the so‐called β‐type molecular array, in which the donor molecules form a head‐to‐tail dimer. The formation of considerable dimerization and the 2:1 donor–anion ratio result in an effectively half‐filled electronic nature. These salts show metallic conducting behavior from room temperature. The metallic conducting behavior of ( 3 ) 2 [Ag(CN) 2 ] was retained down to 8 K; however, the resistivity of ( 3 ) 2 [Au(CN) 2 ] increased at around 50 K. The magnetic susceptibility of ( 3 ) 2 [Au(CN) 2 ] suggests that the strength of the electron correlation for this salt is enhanced below 50 K.