Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Molecular Switching Coordination Polymers. 4.4'-Chalcogenobispyridine Bridged Cobalt Benzoquinone Complexes

  • Published : 1995.06.20
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Abstract

The reaction of Co2(CO)8 with 3,6-di-tert-butyl-1,2-benzoquinone in the presence of the respective 4,4'-chalcogenobispyridine results in the coordination polymers of [CoⅢ(4,4'-X(Py)2)(DBSQ)(DBCat)]n (X=S, Se, Te; Py=pyridine; DBSQ=3,6-di-tert-butylsemiquinone; DBCat=3,6-di-tert-butylcatechol). The title compounds undergo an intramolecular Cat → Co electron transfer, and thus change toward the [CoⅡ(4,4'-X(Py)2)(DBSQ)2]n at elevated temperature. The temperature-switching properties of the compounds directly depend upon the electronegativity of the chalcogen atom of the 4,4'-chalcogenobispyridine coligands. The spectroscopic data disclose that the properties of [CoⅢ(4,4'-S(Py)2)(DBSQ)(DBCat)]n and [CoⅢ(4,4'-Se(Py)2)(DBSQ)(DBCat)]n are similar each other in contrast to those of [CoⅢ(4,4'-Te(Py)2)(DBSQ)(DBCat)]n.

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