Synthesis, structure and second harmonic generation of novel inorganic–organic hybrid, (p-cyano-1-hydrogenpyridinium)2CdI4

A novel noncentrosymmetric inorganic–organic hybrid compound, (CHP)2CdI4 (CHP=4-cyano-1-hydrogen pyridinium), has been synthesized and the structure contains randomly arrayed CHP cations with two possible orientations, which is stabilized via hydrogen-bonding interactions with isolated and perfectly packed CdI42− tetrahedrons, showing a moderate second harmonic generation (SHG) of about three times as large as that of KDP.