New supramolecular hybrids based on A-type Anderson polyoxometalates and Mn–Schiff-base complexes

By combination of metal–Schiff-base complexes and A-type Anderson heteropolymolybdates, two new metal–Schiff-base polyoxometalate hybrid compounds [Mn(salen)(H2O)2]2Na3[IMo6O24]·18H2O (1) and [Mn(salpn)(H2O)2]2Na3[IMo6O24]·10H2O (2) (salen = N,N′-ethylene-bis(salicylideneiminate) and salpn = N,N′-(1,3-propylene)bis(salicylideneiminate)) have been successfully isolated. Compounds 1 and 2 were characterized by the single crystal X-ray diffraction analysis, elemental analysis, IR spectroscopy, TG analyses and XPS spectra. Single-crystal X-ray diffraction analysis revealed that both compounds exhibit 3-D supramolecular networks stabilized by electrostatic attraction and/or extensive hydrogen-bonding interactions. Moreover, compounds 1 and 2 represent first two examples of organic–inorganic composite supramolecular compounds based on A-type Anderson polyanion and metal–Schiff-based complexes. Photocatalytic experiment indicates that both compounds exhibit good catalytic activities for photodegradation of RhB with UV irradiation.