Crystal Structure and Hirshfeld Surface Analysis of a Heterometallic Hofmann-Type-Like Compound

Abstract

In this study; a new heterometallic compound defined by the open formula [Cd(H2O)2Ni(CN)4]4[Cd(H2O)4Ni(CN)4]5 was synthesized in crystal form. Consisting of components such as water molecules, [Ni(CN)4]2− anions, and cadmium transition metal atoms, this new crystal structure has no analogues which might have been previously obtained, even with other transition metal atoms. It is a new compound and a unique example of a crystal. The structural properties of this heterometallic compound have been characterized by single crystal X-ray diffraction spectroscopy (SC-XRD), FT-IR spectroscopy, thermal analysis and elemental analysis methods. According to the data obtained from the SC-XRD technique, this heterometallic compound has a monoclinic crystal system and a C2/c space group. The asymmetric unit of this compound consists of five Cd(II) ions, five Ni(II) ions, eighteen cyanide ligands, and fourteen coordinated water ligand molecules. In addition, theoretical calculations have been made with the Gaussian 03 program in order to obtain more information about this heterometallic Hofmann-type-like compound. The chemical properties of this new compound have been calculated using its HOMO and LUMO values and the natural bond orbital (NBO) analyses. In addition, Hirshfeld surface analysis of the asymmetric unit of this compound has been performed with the CrystalExplorer program. As a result of the Hirshfeld surface analysis, extensive information has been obtained about the weak intramolecular and intermolecular forces that form this new crystalline compound.