Synthesis and structural characterization of ruthenium(II) carbonyl complexes with a bistriazole N-heterocyclic carbene ligand

The synthesis and characterization of three new ruthenium(II) carbonyl complexes with a bistriazole-2-ylidene (bitz) ligand are reported. These complexes have been fully characterized by elemental analyses, infrared, and 1H and 13C NMR spectroscopies. Their molecular structures were determined by single-crystal X-ray diffraction. The ruthenium(II) ion is in a distorted octahedral environment, in which the donor atoms are provided by two carbene carbon atoms of the bitz ligands, two carbonyl groups, and two halides. All compounds exhibit the cis(CO)-trans(halogen) conformation. The bite angles of these three complexes, 77.58(12)°, 77.13(14)° and 77.14(11)°, are small as a consequence of the chelation of the bitz ligands.