Modified polyoxometalate: A novel bi-antimony capped, highly reduced α-Keggin polyoxoanion, [PMo7VMo5VIO40Sb2III]4-

A novel modified POM [H4PMo7VMo5VIO40Sb2III](im)2·2H2O (im = imidazole) (1) has been hydrothermally synthesized from the system Sb2O3–H3PMo12O40–H2C2O4–im and characterized by elemental analysis, IR, UV–Vis, XPS, TGA and single crystal X-ray diffraction. The highly reduced polyoxoanion [PMo7VMo5VIO40Sb2III]4- represents the first example of bi-antimony capped α-Keggin phosphomolybdate, in which the Sb atoms exhibit novel Ψ-rhombic pyramidal {SbO4E} hemidirected coordination geometry with coordination number 4.

Graphical abstractThe highly reduced polyoxoanion [PMo5VIMo7VO40Sb2III]4- represents the first example of bi-antimony capped α-Keggin phosphomolybdate, which further act as the structure unit for the construction of the interesting 2D inorganic layer through Sb–O secondary bondings. The Sb caps exhibit fundamentally novel Ψ-rhombic pyramidal {SbO4E} hemidirected coordination geometry with coordination number 4.Figure optionsDownload full-size imageDownload as PowerPoint slide