A new class of triazepine–ruthenium(II) complexes: synthesis, crystal structure and NMR spectroscopic properties

Two unprecedented three-dimensional ruthenium(II) complexes I and II derived from 2-methyl-5-oxo-7-phenyl-3-thioxo-3,4,5,6-tetrahydro-2H-1,2,4-triazepine (HTAZO) and 2-methyl-7-phenyl-3,5-dithioxo-3,4,5,6-tetrahydro-2H-1,2,4-triazepine (H2TAZS) have been prepared by the reaction of these triazepines with [Ru(p-cymene)Cl2]2 in the presence of triethylamine. NMR spectroscopic and X-ray diffraction studies of the structures of the resulting complexes reveal different behavior of HTAZO and H2TAZS in the coordination process.