科研之友
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摘要
The eight-nickel-capped polyoxoazonickelate, [Ni(20)(OH)(24)-(MMT)(12)(SO(4))](NO(3))(2)center dot 6H(2)O (1; MMT = 2-mercapto-5-methyl-1,3,4-thiadiazole), has been synthesized, which has an alpha-Keggin structure with eight nickel caps. In this structure, the polyatom is the late transition metal Ni(II); the central heteroatom is S, and the organic terminal ligand becomes the primary part of the Keggin structure. This is a Keplerate-type cluster which shows a central Ni(12)(II) cuboctahedron formed by the 12 Ni(II) centers of the classical alpha-Keggin core and a Ni(8)(II) hexahedron formed by the eight nickel caps.
