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)Mo8 O26] and [cinH](4)[Mo8O26] in DMF gave the dimethylammonium salts [(CH 3)(2)NH2](4)[(cin)(2)Mo8O26] and [(CH3)(2)(NH2)(4)][Mo8O26], respectiv ely. Refluxing the octamolybdate salts [RNH](4)(*RN)(2)Mo8O26] in aqu eous ethanol containing dissolved NaCl caused displacement of the two coordinated RN molecules and essentially quantitative formation of th e corresponding hexamolybdate(VI) salts [RNH](2)[Mo6O19].