Revisiting the Coordination Chemistry of Molybdenum(V): Novel Complexes with Pyrazinoate and Picolinate Ligands

Reactions of (pyH)5[MoOCl4(H2O)]3Cl2 with picolinic and pyrazinoic acids yielded three new dinuclear molybdenum(V) complexes: (pyH)2[Mo2O4Cl2(pic)2]·CH3CN (1), (pyH)2[Mo2O4Cl2(pic)2]·CH3CH2CN (2) and (pyH)2[Mo2O4Cl2(pyraz)2]·CH3CN (3) (pic− = picolinate, pyraz− = pyrazinoate and pyH+ = protonated pyridine). The compounds were characterized by single-crystal X-ray diffraction, infrared and 1H NMR spectroscopy, elemental analysis, and TG/DSC measurements. All display a robust {MoV2O4}2+ core with the heteroaromatic ligands bound in a N,O-bidentate chelating manner.