科研之友
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摘要
Three inorganic- organic hybrids based on polyoxometalate (POM), [Cu-6(bbtz)(6)(HPM12O40)]center dot 2H(2)O (M = Mo, 1: W, 2) and [Cu-6(trz)(2)(bbtz)(2)(SiW12O40)] (3) (trz = 1-H-1,2,4-triazole, bbtz = 1,4-bis(1,2,4-triazol-1-ylmethyl)benzene), were synthesized under hydrothermal conditions, and structurally characterized. Through the use of the flexible ligand bbtz, isostructural compounds 1 and 2 with interpenetrating Structures were obtained. In compound 1, ladder-like chains exist, in which the PMo12 anions act as "middle rails". These chains are linked by wave-like [Cu(bbtz)](n)(n+) lines to construct a three-dimensional (3D) framework. Two Such Frameworks penetrate each other to construct a 2-fold interpenetrating structure. By introducing the rigid ligand trz, Compound 3 with an un-interpenetrating structure is obtained. In compound 3, two-dimensional (2 D) (6 3)2 metal organic framework (MOF) layers exist, which are linked by Keggin anions to construct a 3D (4(4).6(2))(6(3))(2) framework. The differences between these compounds should be ascribed to the introduction of the rigid molecule trz that plays a role in restraining the formation of interpenetrating structures.
