Synthesis and characterisation of the amidine complexes trans-[PtCl(NH3){HNC(NH2)R}2]Cl (R = Me, Ph, CH2Ph) derived from addition of NH3 to the coordinated nitriles in trans-[PtCl2(NCR)2]

The di-nitrile complexes trans-[PtCl2(NCR)2] (R = Me, Ph, CH2Ph) react with an excess of gaseous NH3 in CH2Cl2 at −10 °C to form, in high yield, the corresponding di-amidine complexes trans-[PtCl(NH3){HNC(NH2)R}2]Cl in which also one chlorine ligand has been displaced by NH3. The 1H NMR spectra in DMSO showed the formation of different species which were characterized through NOESY, TOCSY and 1H/13C heteronuclear correlations as trans-[Pt(NH3){HNC(NH2)R}2(DMSO)]Cl2 and trans-[PtCl{HNC(NH2)R}2(DMSO)]Cl.

Graphical abstractThe di-nitrile complexes trans-[PtCl2(NCR)2] (R = Me, Ph, CH2Ph) react with NH3 to form, in high yield, the corresponding di-amidine complexes trans-[PtCl(NH3){HNC(NH2)R}2]Cl in which also one chlorine ligand has been displaced by NH3. The 1H NMR spectra in DMSO showed the formation of different solvated species which were characterized through NOESY, TOCSY and 1H/13C heteronuclear correlations as trans-[Pt(NH3){HNC(NH2)R}2(DMSO)]2+ and trans-[PtCl{HNC(NH2)R}2(DMSO)]+.Figure optionsDownload full-size imageDownload as PowerPoint slide