SYNTHESIS AND STRUCTURE OF [(CH3)(4)N](4)[H2MOV9O28]CL-CENTER-DOT-6H(2)O

[(CH3)(4)N](4)[H2MoV9O28]Cl . 6H(2)O has been synthesized from ammoniu m vanadate and molybdenum(VI) oxide in acidic aqueous solution by addi ng tetramethylammonium chloride, and its structure determined by singl e-crystal X-ray analysis. The polyoxomolybdovanadate anion has the str ucture of the decavanadate anion with the molybdenum atom substituted at one ''capping'' vanadium site. Owing to the 2/m symmetry of the ani on, this molybdenum atom is randomly distributed over four ''capping'' metal atom positions. Two hydrogen atoms are bonded to triply bridgin g oxygen atoms. Copyright (C) 1996 Elsevier Science Ltd