Synthesis, magnetic and spectral studies of some mixed-ligand nitrosyl complexes of {MoNO}(4) electron configuration involving potentially mono-, bi-and tri-dentate heterocyclic donors

Mixed-ligand cyanonitrosyl complexes of Mo(II) of the type [Mo(NO)(CN)(3)(L )(2)], formed by the interaction of pentacyanonitrosylmolybdate(II) anion w ith some pyridine derivatives (L), viz., nicotinamide, nicotinic acid hydra zide, isonicotinic acid hydrazide, 2-benzoylpyridine, nicotine and 2-hydrox y methylpyridine have been prepared, and the products characterized by elem ental analyses, molar conductances, magnetic measurements, electronic and i nfrared spectral studies. The IR spectral studies suggest that all the hete rocyclic compounds behave as monodentate ligands coordinating through the r ing nitrogen. Molybdenum (II) has a low-spin (MoNO)(4) electron configurati on in these diamagnetic complexes which behave as non-electrolytes. Suitabl e octahedral structures have been proposed for these complexes.