<scp>l</scp>-Homoproline-Directed Synthesis of Organic–Inorganic Metal Iodides for Second Harmonic Generation

Abstract

Three organic–inorganic metal iodides, namely, (NH 4 )( l -hp)ZnI 3 ( 1 ), [Cd( l -hp) 4 ]Cd 3 I 8 ( 2 ), and ( l -Hhp)( l -hp)PbI 3 ( 3 ), have been synthesized using l -homoproline ( l -hp) as the structure-directing agent. These compounds feature different noncentrosymmetric structures and optical properties. In particular, compound 3 shows a large second-harmonic-generation response of 3.4 times that of KH 2 PO 4 . Density functional theory calculations were performed to gain insight into its structure–property relationship.