Multiple Functions of l-Thioproline in the Synthesis of Chiral Metal Bromides Showing Second-Harmonic-Generation Responses

Abstract

Three new homochiral metal bromides, namely, (L-Htp) 2 Cu 2 Br 4 (1), (L-Htp)(L-tp)CdBr 3 (2), and (L-tp) 2 ZnBr 2 (3), were prepared using L-thioproline as the chiral template. These compounds feature dimeric, chainlike, and monomeric structures. Their second-harmonic-generation (SHG) efficiencies are 0.1, 0.3, and 2.0 times that of KH 2 PO 4 , respectively. Density functional theory calculations were performed to reveal the origin of the SHG response of compound 3.