Two molybdophosphate compounds,[Ni（bim）3]2[H2P2Mo5O23]·2H2O 1 and [Zn（bpy）2]2[Zn（bpy）（H2O）]2Zn[Mo6O12（OH）3（HPO4）4]2·9H2O 2 （bim = 2,2＇-biimidazole,bpy = 2,2＇-dipyridyl）,have been synthesized under hydrothermal conditions and structurally characterized by elemental analysis,TG,and IR. The single-crystal X-ray analysis exhibits that 1 consists of one [H2P2Mo5O23]4-,two [Ni（bim）3]2＋ cations and two lattice water molecules,while 2 is constructed from one sandwich-type [ZnP4Mo6] anion modified by four Zn-bpy complexes and nine lattice water molecules. The electrochemical behaviors of compounds 1 and 2 have been studied in detail based on solid bulk modified carbon paste electrodes of compound （CPEs）.
Three new one-dimensional compounds [{NaO2（H2O）2}2{（M（H2O）2）2（WO2）2- （BiW9O33）2}]·16H3O＋·XH2O （M = MnII （1）, CoII （2）, NiII （3）） have been synthesized in an aqueous solution, and structurally characterized by elemental analysis, IR, TG and single-crystal X-ray diffraction. These tungstobismuthates reveal that one common feature is the trivacant β-B-BiW9O33 Keggin fragment as the structural building unit. Two β-B-BiW9O33 units are connected by two WO2 groups with further stabilization by the addition of two M（H2O）22＋ groups leading to the M2Bi2W20 anions, which are linked in a 1-D chain by bisodium cluster. Electrochemical analyses show that compounds 1-3 display unique redox properties and good electrocatalytic activity to reduce nitrite.
