SYNTHESIS OF ISOPOLYOXOMOLYBDATE(VI) SALTS COMPRISING ASYMMETRIC ORGANIC-BASES

Aqueous solutions of MoO3.2H(2)O and/or [NH4](6)[Mo7O24].4H(2)O react with chloroform solutions of asymmetric organic nitrogen-bases [*RN = (+)-cinchonine (cin), (+)-hydroquinidine (hqid) and (-)-quinine (gin)] to give beta-octamolybdate(VI)) salts of formulation [*RNH](4)[(*RN)(2)Mo8O26] and [*RNH](4)[Mo8O26]. When HCl was added, complexes of the type H-2[*RNH](2)[Mo8O26] were formed. Refluxing [cinH](4)[(cin)(2)Mo8O26] and [cinH](4)[Mo8O26] in DMF gave the dimethylammonium salts [(CH3)(2)NH2](4)[(cin)(2)Mo8O26] and [(CH3)(2)(NH2)(4)][Mo8O26], respectively. Refluxing the octamolybdate salts [*RNH](4)(*RN)(2)Mo8O26] in aqueous ethanol containing dissolved NaCl caused displacement of the two coordinated *RN molecules and essentially quantitative formation of the corresponding hexamolybdate(VI) salts [*RNH](2)[Mo6O19].