The first 2-D organic–inorganic hybrid containing two types of hexa-CuII sandwiched polyoxotungstate units and mixed amines

• Sandwich-type germanotungstate.
• 2-D hexa-CuII substituted polyoxotungstate.
• Hexa-CuII-containing polyoxotungstate with mixed amine ligand.
• Germanotungstate with two kinds of hexa-CuII sandwiched units.

A novel 2-D hexa-CuII substituted sandwich-type polyoxotungstate [Cu(H2O)4][Cu(dien)(H2O)2]2[Cu(dien)(H2O)]2[Cu6(en)2(H2O)2(B-α-HGeW9O34)2][Cu6(Hdien)2(H2O)2(B-α-HGeW9O34)2]·24 H2O (1, en = ethylenediamine, dien = diethylenetriamine) has been hydrothermally synthesized and structurally characterized by elemental analyses, IR spectroscopy, powder X-ray diffraction (PXRD), thermogravimetric analysis (TGA) and single-crystal X-ray diffraction. 1 represents the first 2-D inorganic–organic hybrid sandwich-type germanotungstate constructed by two kinds of hexa-CuII substituted sandwich-type POM hybrid units accompanying the mixed organoamine components in the structure. The TGA curve of 1 displays two continuous weight loss stages.

Graphic abstractA novel polyoxotungstate was made and characterized, in which two kinds of hexa-Cu sandwiched polyoxoanions, [Cu6(en)2(H2O)2(B-α-HGeW9O34)2] and [Cu6(Hdien)2(H2O)2(B-α-HGeW9O34)2], linked by [Cu(dien)(H2O)]2 + and [Cu(H2O)4]2 + complex bridges to form 2-D layer.Figure optionsDownload as PowerPoint slide