Hydrothermal syntheses and crystal structures of two novel inorganic-organic hybrid compounds based on saturated α-Keggin phosphomolybdate clusters

摘要

Two novel inorganic-organic hybrid compounds based on α-Keggin {PMo_(12)O_(40)} (PMo12) clusters, [Cu~I(bim)2]2 {[Cu~(II)(bim)2]2[PMo~(VI)9lvlo~V3O_(40)]} (1) and [Cu~ICmim)2]4[PMo~(VI)Mo~VO40]·HaO (2) (bim = benzimidazole, mim = 2-methylimidazole), have been hydrothermally synthesized and characterized by single crystal X-ray diffraction, IR spectrum, PXRD, elemental and TG analyses. Single crystal X-ray diffraction analyses reveal that both the two three-dimension (3D) supramolecular structures include left- and right-handed helical chains formed by modified polyoxometalate (POM) clusters via hydrogen bonds. 1 is an unusual bicapped Keggin compound with two Cu atoms as caps connecting with the POM via four bridging oxygen atoms, respectively. 2 is a tetrasupporting compound based on PMol2 cluster modified by four [Cu~I(mim)2]~+ fragments. Photocatalytic activities of the two compounds have also been investigated in this paper.