Thermally induced dimensionality changes in derivatives of a super stable Blatter radical

Two derivatives of a super stable Blatter radical (1,3-diphenyl-7-trifluoromethyl-1,4-dihydrobenzo[e][1,2,4]triazin-4-yl) with N(1)-Ar = 2-CF3C6H4 and 2-MeOC6H4 were obtained and investigated using XRD and SQUID magnetometry methods. The investigation revealed strong antiferromagnetic interactions in both radicals, which are described using the Hatfield model. For the latter radical, an abrupt and reversible change in the & chi;(T) plot was observed at 29 K. It was ascribed to a structural transition, consistent with a two-dimensional to one-dimensional thermally activated crossover, as supported by specific heat measurements (C(vH)vs. T). It is suggested that the transition is related to an order-disorder transition of the CF3 group, which is corroborated using XRD structural analysis.

Automated summary

Two derivatives of a super stable Blatter radical with different substitutes were obtained and studied using XRD and SQUID magnetometry methods. Both radicals showed strong antiferromagnetic interactions, and a structural transition was observed in one of the radicals at 29 K, indicating a two-dimensional to one-dimensional thermally activated crossover. The XRD structural analysis confirmed that the transition is related to an order-disorder transition of the CF3 group.