Polyoxoanion-enveloped Ag/ptz inorganic–organic hybrid system: From a single to a double template

Abstract

By changing the polyoxoanions in the same metal–organic system (Ag/ptz), two novel inorganic–organic hybrids: [Ag₁₀(ptz)₅(HP₂W₁₈O₆₂)(H₂O)₄]·2H₂O (1), [Ag₇(ptz)₅(H₂SiW₁₂O₄₀)(H₂O)] (2) (ptz = 5-(4-pyridyl)-tetrazolate), are synthesized under hydrothermal conditions, and characterized by IR spectra, elemental analyses and single crystal X-ray diffraction. Compound 1 and 2 show 3D POM-templated framework structures. In compound 1, a 2D layer is constructed by “shield-like” metal–organic circles templated by P₂W₁₈ polyoxoanions, which is extended to a 3D structure by covalent bonds in an interdigital mode. In compound 2, a 3D network is constructed by 2D layers and a “double bridge-pillar”, the Keggin polyoxoanion templates are enveloped in pairs in nanocages. The influences of polyoxoanion templates on the frameworks are discussed. The electrochemical behavior and luminescent properties for compound 1 and 2 are investigated.