Synthesis, structure and vibrational spectroscopy of palladium(II) complexes with 2-thiophenecarboxylic hydrazide (tch): Crystal structure of [PdCl2(tch)2]·2dmf

The X-ray single crystal investigation revealed that Pd2+ ion is bonded to tch ligands only via amine nitrogen atoms, forming with two chloride ions a quasi-square metal environment. The crystal slowly looses dmf molecules transforming into complex which can also be obtained by mixing the PdCl2 and tch water solutions. Both compounds, together with their bromo derivatives, have been intensively investigated by vibrational spectroscopy methods employing the palladium isotope substitution, deuteration and theoretical calculations on the DFT level. All those attempts resulted in complete assignment of the observed bands, in terms of potential energy distribution.