Diamagnetic anisotropy of molecular complexes of 1,3,5-trinitrobenzene with anthracene and carbazole

The anisotropy of the diamagnetic properties of 1 : 1 EDA complex crystals of 1,3,5-trinitrobenzene with anthracene (A—TNB) and carbazole (C—TNB) has been measured as a function of temperature in the range 100–293 K. The results for 293 K are found to be in good agreement with the values calculated according to the rule of additivity for molecular susceptibilities. The temperature dependence of the diamagnetic anisotropy for both A—TNB and C—TNB crystals, is discussed in the context of possible phase transitions in the crystals. The influence of thermal motions on the diamagnetic properties is described