A pressure sensitive two-dimensional tetracyanoquinodimethane (TCNQ) salt of a stable free radical

A D(A)2.5 charge-transfer (CT) salt was prepared employing a neutral, stable free radical as a donor. The CT solid had a structure composed of (TCNQ)2 layers. Static magnetic susceptibility and ESR measurements indicated an antiferromagnetic ordering below 20 K. The salt was a semiconductor at room temperature and atmospheric pressure with a strongly pressure-dependent conductivity.