Two Keggin compounds constructed from tri −/tetra-nuclear Cu clusters linked mono copper(II)-substituted phosphomolybdates

•Both compounds 1 and 2 own mono copper(II)-substituted PMo11Cu anions.•Compound 1 has a tetra-nuclear CuI cluster and 2 owns a tri-nuclear CuII cluster.•Compounds 1 and 2 were obtained under the same conditions except different pH.

Two new compounds based on mono copper(II)-substituted phosphomolybdate, [Cu4(tea)6(H4PMo11CuO39)(PMo12O40)]2·33H2O (1) and [Cu3(tea)6(H2O)2(H2PMo11CuO39)2]2·30H2O (2) (tea = 2- [1,2,4]triazol-4-yl-ethylamine), have been synthesized under hydrothermal conditions. Compound 1 owns tetra-nuclear clusters [Cu4(tea)6], linking a pair mono copper(II)-substituted and saturated Keggin anions to form a 2D structure. Compound 2 contains tri-nuclear clusters [Cu3(tea)6], fusing four mono copper(II)-substituted anions to construct a discrete four-membered cycle structure.

Graphical abstractBy adjusting pH, two new compounds [Cu4(tea)6(H4PMo11CuO39)(PMo12O40)]2·33H2O (1) and [Cu3(tea)6(H2O)2(H2PMo11CuO39)2]2·30H2O (2) were obtained from the same synthetic system. Compound 1 owns an anionic dimmer containing a mono-substituted PMo11Cu and a saturated PMo12. Tetra-nuclear CuI clusters link the anionic dimmers to form a 2D network. In compound 2, the mono-substituted anions are linked by tri-nuclear CuII clusters to form a four-membered cycle structure.Figure optionsDownload full-size imageDownload as PowerPoint slide