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

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.