Synthesis and crystal structures of inorganic–organic hybrids incorporating an aromatic amine with a chiral functional group

Abstract

In this paper we report the synthesis and the crystal structure of inorganic–organic hybrids containing various lead halides as the inorganic motif and a primary amine as the organic constituent. The organic molecule investigated is (C₆H₅C*H(CH₃)NH₂) and both the R and S as well as the racemic (±) forms were used. Within the structures obtained, three different inorganic motifs are displayed by the lead halide octahedra: 1-D polymeric face-sharing chains of formula PbCl₃((R)–C₆H₅CH(CH₃)NH₃), PbBr₃((R)–C₆H₅CH(CH₃)NH₃), PbI₃((R)–C₆H₅CH(CH₃)NH₃) and PbI₃((S)–C₆H₅CH(CH₃)NH₃); 1-D polymeric corner-sharing chains of formula PbCl₅((±)–C₆H₅CH(CH₃)NH₃)₃ and PbBr₅((±)–C₆H₅CH(CH₃)NH₃)₃; and 2-D corner-sharing layers of formula PbI₄((S)–C₆H₅CH(CH₃)NH₃)₂ and PbI₄((R)–C₆H₅CH(CH₃)NH₃)₂. The changes in geometry and intermolecular interactions such as hydrogen bonding and pi stacking are discussed and compared between the eight structures.