The pyridine and 3,5-lutidine complexes of quinquevalent molybdenum have been prepared. The infrared, electronic and reflectance spectra and magnetic susceptibility data of the complexes are reported. It is found that the binuclear complexes contain the di-${mu}$-oxo-dimolybdenum(V) group, $MoO_2Mo$, and the possible structures are proposed on the basis of elemental analysis and physical measurements.