A2Zn3P4S13 (A = Rb and Cs): First Infrared Nonlinear Optical Materials with Mixed Thiophosphate Functional Motifs PS4 and P2S6

Two new IR NLO thiophosphates A 2 Zn 3 P 4 S 13 (A = Rb, Cs) feature [Zn 3 P 4 S 13 ] anionic framework and contain two types of NLO-active thiophosphate units (PS 4 and P 2 S 6 ), which to our best knowledge is unprecedented in known IR NLO thiophosphates.