First transition metal coordination compound supported on metal–oxygen cluster with bicapped quasi-Keggin structure: <f>[Cu(en)2(H2O)]4[Cu(en)2]3.5[PMoVI8VIV6O42Cu(en)(1,10′-phen)]3·14H2O</f>

A novel compound, <f>[Cu(en)2(H2O)]4[Cu(en)2]3.5[PMoVI8VIV6O42Cu(en)(1,10′-phen)]3·14H2O</f> 1 (en = ethylenediamine, phen = phenanthroline), was synthesized hydrothermally (170 °C, 10 days, autogeneous pressure) and characterized by IR, ESR, elemental analyses and X-ray crystallography. The results of structure determination show that compound 1 contains three different structure cluster anions <f>[PMoVI8VIV6O42]7−</f> supporting complex cation <f>[Cu(en)(1,10′-phen)]2+</f>, in which one cluster anion possesses typical bicapped Keggin structure, while other two polyanions only have bicapped quasi-Keggin structures, and <f>[Cu(en)(1,10′-phen)]2+</f> is linked through oxygen atoms to different V positions of two bicapped quasi-Keggin units. [Copyright &y& Elsevier]