TCNQ RADICAL SALTS CONTAINING MAGNETIC COMPLEXES - DIFFERENT INTERACTION MODES OF TCNQ WITH COPPER TETRAAZAMACROCYCLES

This work is devoted to the study of compounds [M(N-4)](TCNQ)(n), wher e N-4 = saturated or unsaturated tetraazamacrocycles, TCNQ = 7,7,8,8-t etracyanoquinodimethane, n = 2, 3. The metal is coordinated to two TCN Q groups only when there is coordinative unsaturation oil it. When n = 2 all the TCNQ units are radical anions and no charge delocalization is observed. In the compounds with n = 3 only 2/3 of the TCNQ are nega tively charged and a greater charge delocalization is possible: This d elocalization only appears when none of the TCNQ's are coordinated to the metal and it is reflected in the higher conductivity values obtain ed in the solid state.