Hybrid organic-inorganic triguanidine arsenate dihydrate for ultraviolet nonlinear optical application.

Introduction of the planar organic cation [C(NH 2 ) 3 ] + into tetrahedronal inorganic arsenate generates a new ultraviolet nonlinear optical crystal triguanidine arsenate dihydrate, [C(NH 2 ) 3 ] 3 AsO 4 ·2H 2 O, which exhibits a short ultraviolet absorption edge (210 nm), suitable second-harmonic generation response (0.9 × KDP), and moderate birefringene (0.0387 at 546 nm). Notably, by optimizing the growth conditions, transparent and wafer well-developed bulk single crystals can be easily prepared.