NEW ORGANIC LOW-TEMPERATURE CONDUCTOR - HMTSF-TNAP

Conductivity and optical data on a new organic, conducting charge transfer salt Δ2, 2′-Bi-(4,5-trimethylene-1,3-diselenole) 11,11′,12,12′-tetracyano-2, 6-napthoquinodimethane (HMTSF-TNAP) are given. σ(300 K)= 2400 ± 600 Ω-1 cm-1. A maximum in σ(T) is found at TM = 47 K with σ(TM)/σ(300 K) = 6.0 ± 10%, and σ(1.5 K) > 250 Ω-1. σ(T) is well defined in the high temperature region, but is sample dependent at low temperatures. The optical data indicate a bandwidth and carrier density comparable to that of HMTSF-TCNQ. © 1978.