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Article Dans Une Revue European Journal of Inorganic Chemistry Année : 2012

Binuclear Copper Complexes and Their Catalytic Evaluation

Résumé

Two binuclear copper complexes [{CuI(L1)}2][OTf]2 (1) and [{CuII(L2)Cl}2] (2) have been synthesized and structurally characterized. The reaction of [{(5,7-dimethyl-1,8-naphthyridin-2-yl)amino}carbonyl]ferrocene (L1) with [Cu(CH3CN)4][OTf] in dichloromethane afforded complex 1 in high yield and the dicopper(II) complex 2 was obtained by the overnight treatment of N-(5,7-dimethyl-1,8-naphthyridin-2-yl)-1-methylpyrrolidine-2-carboxamide (L2H) with [Cu(CH3CN)4][BF4] in dichloromethane. The two copper atoms in complex 1 are bridged by two L1 ligands in a trans disposition; the naphthyridine nitrogen atoms bridge two copper centers and the carbonyl oxygen atoms occupy sites trans to the Cu***Cu vector. The metal***metal distance is 2.4594(6) Å. In contrast, in complex 2, each of the two L2 ligands bind to the two copper atoms through one naphthyridine nitrogen, a deprotonated amide, and a proline nitrogen atom to form an open-book geometry. Both dicopper complexes have been shown to be excellent catalysts for the cyclopropanation of various olefins with ethyl diazoacetate (EDA), with catalyst 1 found to be marginally superior to 2.

Domaines

Catalyse

Dates et versions

hal-00868631 , version 1 (01-10-2013)

Identifiants

Citer

Rajat K. Das, Mithum Sarkar, S. M. Wahidur Rahaman, Henri Doucet, Jitendra K. Bera. Binuclear Copper Complexes and Their Catalytic Evaluation. European Journal of Inorganic Chemistry, 2012, 2012 (10), pp.1680-1687. ⟨10.1002/ejic.201101283⟩. ⟨hal-00868631⟩
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