N,N′-dicyanoquinone diimines (DCNQIs): unique acceptors for conducting materials
作者： Siegfried Hünig
DOI: 10.1039/JM9950501469
关键词: Phase transition 、 Chemistry 、 Electronic effect 、 Copper 、 Stereochemistry 、 Kinetic isotope effect 、 Acceptor 、 Crystallography 、 Ion 、 Semiconductor 、 Conductivity
摘要: Replacement of the classical acceptor TCNQ with (substituted) DCNQIs opens new routes to organic conducting materials. The radical anion salts [2,5-R1,R2-DCNQI]2M (R1,R2= Hal, Me, MeO; M = Li, Na, K, NH4, Cu, Ag, Tl) all belong same space group l41/a or related ones (C2/c P4/n); therefore, correlation between molecular size and electronic effects substituents bulk properties (conductivity, susceptibility, etc.) can be evaluated. Only copper display metallic conductivity, some which undergo a phase transition (TM → 1) semiconductor on cooling. For this threshold coordination angle N–Cu–N is found, by changing an unprecedentedly large isotope effect upon deuteriation [2,5-Me2DCNQI]2 induced. Upon TM 1 conductivity decreased factor 107–108.
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