Role of non-covalent interactions to dictate chiral selective self-assembly in Ni(II), Cu(II) and Cd(II) complexes of a racemic 1,2-dihydroquinazolinone ligand

Abstract

Managing chirality at supramolecular level is an important aspect in crystal packing of chiral organic and organometallic molecules. Herein molecular structure of Ni(II), Cu(II) and Cd(II) complexes of a racemic 1,2-dihydroquinazolin-4(1H)-one ligand is described. The Cd(II) complexes exhibit intriguing structural features viz. capped octahedral geometry with seven coordination, and the presence of bridging as well as end-on azido ligand coordination to one metal center. Homo/heterochiral self-assembly in the complexes is dictated by strong NH⋯N, NH⋯O, NH⋯Cl hydrogen bonds as well as non-classical CH⋯O, CH⋯N, NH⋯π hydrogen bonds and parallel displaced π⋯π stacking interaction. Chiral self-recognition or self-discrimination process in the crystal packing is governed by the nature and strength of the participating non-covalent interactions.