Novel platinum(II) complexes containing diaminocyclohexane and thiourea derivative ligands: Synthesis and X-ray crystal structure of (trans-1,2-diaminocyclohexane)dithioureaplatinum(II) nitrate monohydrate

Six novel platinum(II) complexes of the form [Pt(dach)L2](NO3)2, where dach = trans-1,2-diaminocyclohexane, L = thiourea (tu) or its derivatives, including 1-acetyl-2-thiourea, 1-ethyl-2-thiourea, 2-imidazolidinethione, 1,3-dimethyl-2-thiourea and 1,1,3,3-tetramethyl-2-thiourea, have been synthesized and characterized by elemental analysis, IR spectrometry, and NMR (1H and 13C) spectroscopy. The general synthetic procedure involves the reaction of [Pt(dach)(H2O)2](NO3)2, which is formed in situ by treating Pt(dach)I2 with silver nitrate, and two equivalents of tu or its derivatives. All the complexes are ionic compounds with nitrate counter ions and thus water soluble. The crystal structure of [Pt(dach)(tu)2](NO3)2·H2O is determined using a single crystal X-ray diffraction method. This compound crystallizes in the orthorhombic space group Pnma with centrosymmetry.