[N′-(5-Chloro-2-oxidobenzyl-κO)-2,4-dihy­droxy­benzohydrazidato-κ(2) N′,O](methanol-κO)dioxidomolybdenum(VI)–4,4′-bipyridine (1/1)

In the title co-crystal, [Mo(C(14)H(9)ClN(2)O(4))O(2)(CH(3)OH)]·C(10)H(8)N(2), the deprotonated Schiff base O,N,O′-chelates to the Mo(VI) atom, the three atoms involved in chelation comprising the fac sites of the octa­hedron surrounding the methanol-coordinated metal atom. The methanol mol­ecule forms an O—H⋯N hydrogen bond to an N atom of the 4,4′-bipyridine solvent mol­ecule; the hy­droxy group of the Schiff base forms an O—H⋯N hydrogen bond to the other N atom of another mol­ecule. The two hydrogen bonds leading to the formation of a helical chain running along the b axis.