Correlation of Spectroscopic and Magnetic Data of Two Charge Transfer Compounds of TCNQ (Tetracyanoquihodimethane) with Cationic Copper Chelates

摘要

Spectral data for (Cu(en)2) (TCNQ)2 reveal a TCNQ charge transfer band at 1220 nm. The lack of a contribution of paramagnetism from TCNQ(-) to that of (Cu(en)2) (TCNQ)2 is understood since a system with E sub ST of 0.12 eV would exhibit a magnetic susceptibility of .00001 emu/mole at 300 K. The magnetic susceptibility of (Cu(en)2) (TCNQ)2 indicates that one-third an electron is transferred from TCNQ- to (Cu(phen)2) (2+), and E = 0.17 eV. Since E and t are comparable in magnitude, the bandwidth is appreciable, and high electrical conductivities and low activation energies are expected, and observed. Keywords: Electronic spectroscopy; Copper complexes; Magnetic susceptibility; Electrical conductivity; Tetracyanoquinodimethane; Chelate compounds.