Phase Transition and Expected Non-Linear Polarizability of 1-Hydroxy-4-(4-methylphenylamino)-9,10-anthraquinone

The title compound, C₂₁H₁₅NO₃, shows a second-order phase transition above 313 K. Both phases are non-centrosymmetric. According to semi-empirical calculations, these polar crystals are liable to exhibit second-order hyperpolarizability.

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