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Title: Synthesis and Characterization of Cu(I) and Cu(II) Complexes Containing Ketiminate Ligands
Authors: Hsu, Shih-Hsien;Li, Chen-Yi;Chiu, Yi-Wen;Chiu, Mei-Chun;Lien, Yu-Ling;Kuo, Pei-Cheng;Lee, Hon-Man;Huang, Jui-Hsien;Cheng, Cheu-Pyeng
Contributors: 化學系
Keywords: Copper;NHC carbene;Ketiminate
Date: 2007-11
Issue Date: 2012-12-10T01:39:49Z
Publisher: Elsevier
Abstract: A series of Cu(I) and Cu(II) complexes containing substituted ketiminate ligands was synthesized. Reaction of CuCl2 with 2 equiv. of Li[OC(Me)CHC(Me)N(Ar)] in toluene generated dark green solid of Cu[OC(Me)CHC(Me)N(Ar)]2 (1). Similarly, Cu(I) complex, {Cu[OC(Me)CHC(Me)N(Ar)]Li[OC(Me)CHC(Me)N(Ar)]}2 (2) was synthesized by reacting 2 equiv. of Li[OC(Me)CHC(Me)N(Ar)] with CuCl in toluene at room temperature for 12 h. While the reaction of CuCl with Li[OC(Me)CHC(Me)N(Ar)] in the presence of triphenylphosphine in THF solution at room temperature, a three-coordinated Cu[OC(Me)CHC(Me)N(Ar)](PPh3) (3) can be isolated in high yield. Replacing the PPh3 of 3 with N-heterocarbene (NHC) generates Cu[OC(Me)CHC(Me)N(Ar)](NHC) (4) in low yield. Complexes 2, 3, and 4 were characterized by 1H and 13C NMR spectroscopies and all molecules were structurally characterized by X-ray diffractometry. Two coordination modes of ketiminate ligands were found in the molecular structure of 2, one of which is copper-coordinated terminal ketiminates and the other is lithium–copper-coordinated bridging ketiminates.
Relation: Journal of Organometallic Chemistry, 692(24): 5421-5428
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