Av. Yatsenko et al., PHASE-TRANSITION AND EXPECTED NONLINEAR POLARIZABILITY OF -HYDROXY-4-(4-METHYPHENYLAMINO)-9,10-ANTHRAQUINONE, Acta crystallographica. Section C, Crystal structure communications, 52, 1996, pp. 1853-1856
The title compound, C21H15NO3, shows a second-order phase transition a
bove 313 K. Both phases are noncentrosymmetric. According to semi-empi
rical calculations, these polar crystals are liable to exhibit second-
order hyperpolarizability.