Functionalization of the bis-(o-mercaptobenzoato)-cis-dioxomolibdato(VI) anion, [MoO2(o-SC6H4COO)2]2-, with p-substituted arylhydrazines, R-p-C6H4NHNH2, R=H, Me, MeO, Cl, No2 Funcionalizacion del anion bis-(o-mercaptobenzoato)-cis- dioxomolibdato(VI), [Mo