Temperature Dependences of ESR Spectra of 7, 7, 8, 8-Tetracyano quindimethane Salts Composed of Integral Type Polycations

Abstract

The temperature-dependence of ESR absorption intensity (I) of 7, 7, 8, 8-tetracyanoquinodimethane (CQ) salts with polycation in the following general formura, was discussed in relations to electrical conductivity.
In the CQ simple salts, the relationship between I and absolute temperature T was expressed by I cc (1/ T) at temperature lower than 210° K and by I cc (1/ T) [3 + exp (J I kT)]-1 at temperature higher than 210° K. It was suggested from this result that the degenerate states of singlet and triplet changed into the separate ones as the temperature was raised. However, from the disagreement between the separation energy J and the activation energy Efor electrical conductivity, the conclusion was drawn that the triplet state didn't contribute to the conduction through the CQ simple salts.
On the other hand, in the CQ complex salts, the state in which I was independent to T was observed with increasing CQ° molecules and the singlet and triplet states were separated at a temperature above 320° K, where strong interactions between the unpaired electrons were recognized.