A CHARGE-TRANSFER COMPLEX OF CADMIUM WITH TCNQ (7,7',8,8'-TETRACYANOQUINODIMETHANE) AND 1,10-PHENANTHROLINE - OPTICAL, ELECTRONIC AND ELECTRICAL CHARACTERIZATION

A new charge-transfer complex involving cadmium as the electron-donor, TCNQ as the electron-acceptor and the 1,10 phenanthroline (phen) as t he hetero-aromatic ligand, has been synthesized by means of an electro chemical reaction. The average charge on TCNQ, the transition metal ox idation state and the charge-transfer degree of Cd-phen-TCNQ are obtai ned using spectrophotometric measurements and photoelectron spectrosco py. The results ape compared with those determined for Cd-TCNQ, in ord er to obtain insight into the effect of the 1,10 phenanthroline on the electron-transfer reaction. The behavior of the electrical d.c. condu ctivity vs. the temperature shows that Cd-phen-TCNQ has a room tempera ture conductivity of about 0.1 Ohm(-1) cm(-1), which is more than one order of magnitude higher than that of the Cd-TCNQ species, and an ene rgy gap of the order 0.09 eV.