Syntheses, Crystal Structures and Electrochemical Properties of Three New One-dimensional Compounds Based on the BiW9O33 Unit

摘要

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.