LAUSR

An bi-arsenic capped Well-Dawson arsenomolybdates supramolecular material, formulated as, {pyr}{Hbib}2{AsIII2(OH)2AsV2Mo18O62} (1) (pyr = pyrrole; bib = 1, 4-bis(1-imidazoly)benzene) has been hydrothermally synthesized and characterized by elemental analysis, IR, TG, UV, XRD, and single-crystal X-ray diffraction. In the structure of 1, {As2Mo18O62} (abbreviated to {As2Mo18}) polyanions are capped by two disordered AsIII units which are distributed in six symmetric ditches of the {Mo3O13} group on two poles of the Dawson cluster with the occupation ratio of 0.5 and 0.25, respectively. Two kinds of caps: pyramidal-shaped {AsO3} and tetrahedron {AsO3(OH)} caps are formed via the combination of three u-O atoms from Dawson cluster or the same three u-O atoms and one hydroxyl with As centers. Compound 1 represents a brand new bi-capped Dawson structure, which shows good photocatalytic behaviors for degradation of recalcitrant dyes Azon Phloxine (AP). Moreover, compound 1 exhibits an effective inhibition effect on proliferation of Human hepatoma cells (HepG-2) for the synergetic effect of Dawson cluster and AsIII cap.