Copper complexes tetrahedral

Figure 17.29 Structure of distorted tetrahedral copper complexes. SP is sparteine-TV./V, mint is maleonitriledithiolate, dmp is 2,9-dimethyl-1,10-phenanthroline, and phen is 1,10-phenan-throline. Reprinted with permission from Ref. 67. Copyright 2005 American Chemical Society.

An example to illustrate the above strategy consists of treatment of [Cu(NCMe)4] with 2,9-diphenol-1,10-phenanthroline (20), to give the tetrahedral copper complex [Cu... 

In their pursuit of modeling Type I copper proteins, Kitajima et al. reported112 a rare, tetrahedrally coordinated complex (105), which displayed an EPR spectrum consistent with the presence of the unpaired electron in the dz2 orbital.1 They also isolated a square-pyramidal DMF adduct (complex (106)). They were successful in providing structural proof of a copper(II) complex (trigonal pyramidal) with C6F5S -coordinated complex (107), with CuN3S chromo-phore.113 The X-ray analysis (poor data set) of a closely similar complex with Ph3CS as the... 

Despite numerous studies involving copper catalysts, only a few isolated copper complexes have been examined, including complexes (155)-(157). Bipyridine,397 phenanthroline,398 and pyridyli-mine cationic complexes399 all exhibit tetrahedral geometries, in which the copper center is bound to two ligands. 

Tolman, W. B. (1991). A model for the substrate adduct of copper nitrite reductase and its conversion to a novel tetrahedral copper(ll) triflate complex. Inorg. Chem. 30, 4877-4880. 

There is still doubt over the mechanism of this reaction, although polarization of the C—Br bond and chelation of the metal play important roles. It is clear that Cu(I) is the effective catalyst and a tetrahedrally coordinated copper complex (489) can be envisaged to account for the steric and electronic effects observed in these reactions. 

Fig. 13 Principle of the electrochemically induced molecular motion in a rotaxane copper complex. The stable, four-coordinate monovalent complex is oxidized to an intermediate tetrahedral divalent species. This compound undergoes a rearrangement to afford the stable, five-coordinate copper(u) complex.

A close structural situation is observed for clv-planar palladium 908 (M = Pd) [201] and distorted tetrahedral copper 908 (M = Cu) [242] chelates. The N atom of pyridine substituent is turned out from the metal complex-former in these chelates. 

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