Complexation of a hexameric uranium(VI) cluster by p-benzylcalix[7]arene

作者: Pierre Thuéry, , Martine Nierlich , Bahari Souley , Zouhair Asfari , Jacques Vicens

DOI: 10.1039/A903289D

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摘要: The reaction of uranyl nitrate hexahydrate with p-benzylcalix[7]arene (H7L) in the presence 1,4-diazabicyclo[2.2.2]octane (DABCO) resulted formation compound (UO22+)6(L7–)2(O2–)2(HDABCO+)6·3CH3CN· CHCl3·5CH3OH·3H2O 1, whose crystal structure has been determined. In symmetry-centred complex core a hexanuclear uranium(VI) cluster is surrounded by two calixarene units. Each calixarene, conformation different from usual one, encompasses UO22+ moieties, which are bonded to three or four phenolic oxygen atoms and also one other their atoms. ions located between moieties involved, together former ions, pseudo-trigonal µ3-oxo-centred assemblies. This complex, represents largest metal ion assemblies chemistry, illustrates ‘cluster keeper’ character larger calixarenes.

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