ChemInform Abstract: Crystal Structure and Replacement Reaction of Coordinated Water Molecules of the Heteropoly Compounds of Sandwich-Type Tungstoarsenates.
Abstract
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ChemInform Abstract
The new heteropoly compounds (III) are characterized by IR, UV/Vis, and 183W NMR, TG/DSC, and cyclic voltammetry. The structure of (IIIa) is solved by single crystal XRD (triclinic, space group P
, Z = 2). The anion of (IIIa) is isotypic with [Cu4(H2O)2 (P2W15O56)2]16- and consists of a tetrameric Cu4O16 cluster sandwiched between two trivacant Dawson—Wells [As2W15O56]12- anions. The distortion of the rhombic Cu4O16 cluster is smaller in (IIIa) than in the phosphorus analogue. Two Cu atoms of the Cu4O16 cluster are coordinated by H2O molecules. The water molecules can be replaced by [Fe(CN)6]4-, [Fe(CN)6]3-, en, etc., while in organic solvents the coordinated water molecules are lost, leaving unshared positions that can be occupied by some organic ligands such as pyridine, lactic acid, or acetone.
