Synthesis, crystal structure and intermolecular contacts in trans-bis(ethylamine) dichloro platinum(II) and palladium(II) complexes

摘要

The methods of synthesis of trans-bis(ethylamine)dichloro platinum(II) (trans-[Pt(C2H5NH2)(2)Cl-2]) and palladium(II) (trans-[Pd(C2H5NH2)(2)Cl-2]) complexes for obtaining monophase products were developed. For substance characterizations FTIR spectroscopy, thermogravimetric and X-ray diffraction analysis were used. The crystal structures of the synthesized compounds were determined using X-ray powder diffraction technique. The neutral complexes had specific system of intermolecular contacts in the crystals that allowed distinguishing two forms, A and B. Despite of the similar structure and sizes, trans[Pt(C2H5NH2)(2)Cl-2] and trans-[Pd(C2H5NH2)(2)Cl-2] complexes created different hydrogen bond networks and crystal structures. The first had a grid topology of 3(6) with the cells from three and the second - 4(4) from four complexes. It resulted in different thermal behavior. Trans- [Pt(C2H5NH2)(2)Cl-2]-A demonstrated irreversible solid state transition into B-form at 165 degrees C and got new H-bond system with the topology similar to the palladium analog (4 4 ), however, the realized complex arrangement was significantly different. The structure of B-form was stable until the decomposition at 220 degrees C. High-temperature X-ray diffraction demonstrated high elasticity of the H-bond network in trans-[Pd(C2H5NH2)(2)Cl-2]-A. Notwithstanding significant alterations during heating, the H-bond system returns the structure to its initial state.