Transition-metal-nitroxyl complexes are currently of great interest since they are now used in the design of new magnetic Copper(I1)-nitroxyl species exhibit remarkable magnetic properties which are strongly correlated to their coordination geometry; complexes with an equatorially bound nitroxyl ligand exhibit strong antiferromagnetism, while those containing an axial nitroxide exhibit a ferromagnetic behaviors. In both cases the free radical is bound to the copper ion through a metal-oxygen bond. We have now been able to prepare and characterize by X-ray diffraction methods the adduct of copper(I1) bromide with 2,2,6,6-tetramethylpiperidinyl- 1-oxy (Tempo). This adduct is the first metal-nitroxyl complex in which both the oxygen and nitrogen atoms are coordinated to the metal center; to our knowledge it also affords the first example of a three-membered metallacycle
Three-center binding of a nitroxyl free radical to copper(II) bromide / Andrea. Caneschi;Andre. Grand;Jean. Laugier;Paul. Rey;Robert. Subra. - In: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY. - ISSN 0002-7863. - STAMPA. - 110:(1988), pp. 2307-2309. [10.1021/ja00215a055]
Three-center binding of a nitroxyl free radical to copper(II) bromide
CANESCHI, ANDREA;
1988
Abstract
Transition-metal-nitroxyl complexes are currently of great interest since they are now used in the design of new magnetic Copper(I1)-nitroxyl species exhibit remarkable magnetic properties which are strongly correlated to their coordination geometry; complexes with an equatorially bound nitroxyl ligand exhibit strong antiferromagnetism, while those containing an axial nitroxide exhibit a ferromagnetic behaviors. In both cases the free radical is bound to the copper ion through a metal-oxygen bond. We have now been able to prepare and characterize by X-ray diffraction methods the adduct of copper(I1) bromide with 2,2,6,6-tetramethylpiperidinyl- 1-oxy (Tempo). This adduct is the first metal-nitroxyl complex in which both the oxygen and nitrogen atoms are coordinated to the metal center; to our knowledge it also affords the first example of a three-membered metallacycleFile | Dimensione | Formato | |
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