Abstract
Improved synthesis and reinvestigation of the magnetic properties of triphenylamine bearing three nitronylnitroxide radicals ( 1) were carried out. Single crystal X-ray crystallographic analysis of 1 established that its molecular shape had a C 3-symmetry. Our newly prepared 1 showed different physical properties from those of reported. SQUID measurements of 1 showed that each of the three spins of 1 behaved independently at room temperature. In contrast, the three spins coupled antiferromagnetically at lower temperature as low as ca. 1.8 K. These spin behaviors can be explained by a regular triangular antiferromagnetic model ( J/ k B = −3.3 K) and interpreted as a spin frustration system.
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