Three organic-inorganic metal iodides, namely, (NH)(l-hp)ZnI (), [Cd(l-hp)]CdI (), and (l-Hhp)(l-hp)PbI (), 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 shows a large second-harmonic-generation response of 3.4 times that of KHPO. Density functional theory calculations were performed to gain insight into its structure-property relationship.
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