Abstract
[4-NH2C5H4NH][C4H3O4][C4H4O4] (abbreviated as APM) and its N,O-deuterated analogue have been synthesized. The single-crystal X-ray diffraction studies for N,O-deuterated analogue are reported. The Kurtz and Perry powder SHG technique confirms the second order nonlinear optical properties of APM. The structural phase transition of APM occurring at 312K has been examined by infrared spectroscopy. The infrared temperature studies on the polycrystalline APM showed that the modes arising from NH⋯O and OH⋯O intermolecular hydrogen bonds vibrations appear to be very sensitive to the structural phase transition. The molecular mechanism of the phase transition is explained in terms of significant changes in the hydrogen bond configuration.
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