Copper complexes terminal ligands

During the course of modeling copper dioxygen chemistry, Kitajima et al. reported the synthesis of a yu-peroxo dinuclear complex with a 3,5-dimethyl-substituted tris(pyrazolyl)borate ligand, which showed remarkable physicochemical similarities to oxy-Hc and oxy-Tyr. Using a 3,5-di-isopropyl-substituted terminal ligand, they provided the first structural proof of the existence of peroxo dicopper(II) core (108) (copper geometry distorted square pyrami-... 

The copper-alkoxo unit, which is usually synthesized in situ, plays a significant role in metal-promoted transformations of organic substrates by copper(I). To determine the reaction form of the Cu-OPh unit, Floriani and co-workers structurally characterized four complexes (772) (pseudotetrahedral Cu-Cu 3.223 AT (773) (pseudotetrahedral), (774) ( anion linear coordination) and (775) (planar trigonal).57 Using 3,3,6,6-tetramethyl-l-thia-4-cycloheptyne as terminal ligand the structural characterization of a copper(I)-alkyne complex (776) (Cu-Cu 2.940 A) was reported.573... 

It has been known that the reaction of copper(I) iodide with Lewis bases, such as aniline derivatives, produced complexes with single cubane-like CU4I4 cluster, in which the aniline derivatives act as the terminal ligands coordinating to the copper(I) centers [7-10]. Thus, it is reasonable to expect macrocyclic or extended complexes constructed by CU4I4 cluster units through replacing aniline derivatives with ditopic... 

The crystal structures of the free ligand (47a) and that of its copper(II) complex were reported.18 In both cases the terminal /3-diketone residue is present in the keto tautomeric form. The /3-ketoimine fragment of the free ligand is planar and is stabilized by an internal hydrogen bond. The crystal structure of the copper complex shows the metal coordinated in the inner N202 site.18... 

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