Hydrothermal synthesis, structure characterization and catalytic property of a zigzag chain structural cluster compound built on the novel tetra-capped and centered by Ni~(II)

摘要

A zigzag chain structural compound named Ni_(0.5){[Ni(en)]2[Ni(en)(H2O))2[H3NiMo6W6O_(40)]}·3H2O 1 (en = ethylenediamine) was hydrothermally synthesized and characterized by IR, TG and X-ray diffraction analysis. Structural analysis indicates that compound 1 exhibits an unusual Mo/W mixed Ni~(II) centered Keggin structure, which is tetra-capped by two [Ni(en)]~(2+) and two [Ni(en)(H2O)]~(2+) units. Two linkages of M-O-Ni (2) and M-O-Ni(4) connect two adjacent tetra-capping clusters in different directions, and it represents a novel inorganic-organic zigzag chain built on the Ni~(II) centered Keggin species. Compound 1 is demonstrated to be a high selectivity for benzaldehyde in the oxidation of styrene, while the magnetic data of complex 1 were fitted to the Curie-Weiss law and show antiferromagnetic interactions.