科研之友
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摘要
Mn2+ and unusual pentanuclear fragments {[Na-0.5(H2O)(0.5)](2)Mn(OH)(4)(H2O)(2)[Na-0.5(H(2)bim)](2)} are introduced into {P2Mo5} system to yield an infinite 2-D supramolecular layer with two cage-like pores. Compound 1 displays good electrocatalytic activity on reduction of hydrogen peroxide, and fluorescent properties in the solid state at room temperature. An organic-inorganic hybrid based on {P2Mo5} clusters, (H(2)bim)(3)[{Na-0.5(H2O)(0.5)}(2){Mn(OH)(4)(H2O)(2)}{Na-0.5(H(2)bim)}(2){Mn(H2O)(4)(P2Mo5O23)(2)}]center dot 4H(2)O (1) (bim = 2,2'-biimidazole), was hydrothermally synthesized and characterized by elemental analyses, IR, TG, UV, and single crystal X-ray diffraction analyses. In 1, four Na ions, one Mn, and two bim ligands are linked by four mu-O bridges to form unusual pentanuclear fragments [{Na-0.5(H2O)(0.5)}(2){Mn(OH)(4)(H2O)(2)}{Na-0.5(H(2)bim)}(2)]. Each pentanuclear segment links adjacent to four Standberg units to form supramolecular dimer chains, which are further connected by Mn(H2O)(4) linkers to yield infinite 2-D layer. Two kinds of cage-like pores are observed in alternating type along the crystallographic b axis in which protonated H(2)bim ligands fill one sort of pores. Electrochemical and fluorescent properties of 1 have been investigated.
