Different Anderson-Type Polyoxometalate-Directed Metal-Organic Complexes Based on 2-Pyrazine Carboxylic Acid: Assembly, Structures and Properties

摘要

Two different Anderson-type polyoxometalates-directed metal-organic complexes with different structures: {H-2[K(H2O)(5)](2)[Cu(pzca)(H2O)(3)](2)(TeMo6O24)} (1) and {H[Cu(pzca)(H2O)(2)](2)[AlMo6(OH)(6)O-18]} center dot 17H(2)O (2) (Hpzca = 2-pyrazine carboxylic acid) have been synthesized and structurally characterized by single crystal X-ray diffraction analyses, thermogravimetric analyses, IR spectra and powder X-ray diffraction analyses. Compound 1 is a 0D architecture, in which the A-type Anderson anion [TeMo6O24](6-) (TeMo6) is modified by two [Cu(pzca)(H2O)(3)](+) cations and two [K(H2O)(5)](+) cations. The adjacent {[K(H2O)(5)](2)[Cu(pzca)(H2O)(3)](2)(TeMo6O24)} clusters are connected by hydrogen-bonding interactions, resulting in a 3D supramolecular framework. When B-type Anderson anion [AlMo6(OH)(6)O-18](3-) (AlMo6) was used in compound 2, a 2D wave-like network was obtained, in which the adjacent 1D [Cu(pzca)](n)(n+) chains are linked by AlMo6 anions with two terminal oxygen atoms. The types of Anderson anions play an important role in tuning the structures of the title compounds. In addition, the electrocatalytic activities of title compounds and photocatalytic activities of compound 1 have been studied.