X-ray crystal structure of Cu

Figure 20. X-ray crystal structure of Cu trimer (only monomer shown for simplicity). [Adapted from (150).]...

Power, K. N., Hennigar, T. L., Zaworotko, M. J., X-ray crystal structure of Cu[l,2-bis(4-pyridyl)ethane]2(N03)2 n the first example of a coordination polymer that exhibits the NbO 3D network architecture. Chem. Commun. 1998,... 

Account for the pattern of Cu-E (E = O, N) bond distances found in the X-ray crystal structure of [Cu JOClCF jCHC-(CE )OF(bpy)] (6.1), explaining fully the theoretical basis for your argument. 

Recently, the synthesis and X-ray crystal structure of [Cu(dcmpz)2(py)2], 229, were reported (40). Complex 229 was obtained either by reacting [Cu(dcmpz)], 12, (27) with dioxygen in pyridine or by the direct reaction of CuCl2 with Hdcmpz in the presence of pyridine. Complexes having two... 

Fig. 7. X-ray crystal structure of Cu(PMA) reprinted with permission from Brown et al. (111). Copyright 1989 American Chemical Society.

Phosphonomethylglycine - X-Ray Crystal-Structure of Cu(II)(02CCH2NHCH2P03).Na(H20)3.5 Inorg. Chim. Acta 1989,164, 59. 

Copper complexes of bis(2,2 -dipyridyl)dithiocarbamate have been prepared upon insertion of carbon disulfide into the copper-nitrogen bonds of the corresponding 2,2 -dipyridylamine (dpa) complexes (195, 196). Kumar and Tuck (195) initially noted this behavior for [Cu(dpa)] , [Cu(dpa)2], and [Cu(dpa)(dppe)l [dppe = l,2-bis(diphenylphosphino)ethane], but characterization was made only on the basis of the presence of characteristic v(C—S) and v(C—N) bands in their IR spectra. Later, this was confirmed by the X-ray crystal structure of [Cu(S2Cdpa)2], formed upon slow evaporation of a carbon disulfide solution of [Cu(dpa)2] (Eq. 21) (196). The transformation is actually quite complex as in the dpa complex, metal coordination is through the nitrogen atoms of the pyridyl rings (197), and thus a rearrangement to the amide form must occur prior to carbon disulfide insertion. 

By utilizing the conproportionation reaction detailed above, a number of new derivatives have been prepared (R = Pr, Bu, Bz) and the X-ray crystal structure of [Cu(p -S2CNBu2)]4 (Fig. 233) has been carried out. This structure reveals the... 

An X-ray crystal structure of 97 Cu(MeCN) complex displays a tetrahedral geometry at the metal, Fig. 10 (69). The metal center is surrounded by phenyl rings thereby forming a chiral environment. No speculation is advanced on the source of the selectivity and further reports on this catalyst are yet to appear. 

Figure 24. X-ray crystal structures of the [Cu((5, 5)-i-Pr-pybox)](H20)n]X2 complexes 267b and 267b along with selected bond lengths and angles. [Adapted from (197).]...

Fig. 28. X-ray crystal structure of the Cu(II) complex of the antiulcer drug famotidine 115. Adapted from (563). 

The type 1-3 terminology to distinguish different Cu protein active sites remains extremely useful. Sub-groupings are appearing however in all three categories particularly in the case of the binuclear (EPR inactive) type 3 centers. Thus, in the recently determined X-ray crystal structure of ascorbate oxidase the type 3 and type 2 centers are present as a single trimer unit [. A discrete binuclear type 3 center is, however, retained in hemocyanin [6]. 

While there is at present no full understanding as to why plastocyanin should require two sites for reaction, there is now much evidence detailing this two-site reactivity. Moreover, the recent X-ray crystal structure of ascorbate oxidase (which has 4 Cu atoms per molecule) has indicated a plastocyanin-like domain, with the two type 3 Cu s (in close proximity with the type 2 Cu) located at the remote site. Fig. 2 [5]. Since electrons are transferred, from the type 1 Cu to O2 bound at the type 3 center this structure defines two very similar through-bond routes for biological electron transfer. 

The recent X-ray crystal structure of ascorbate oxidase [6] has indicated the relative positions of type 1, 2 and 3 Cu centers. The type 1 center is in a plastocyanin like domain, and is the primary acceptor of electrons from substrate. The shortest pathway for electron transfer from the type 1 to type 3 Cu s is the bifurcated path via Cys508 and either His 507 or His509. The two histidines are part of the plastocyanin-like domain, and serve also to coordinate the type 3 Cu s, Fig. 2. The His507 to Cys508 bonding is similar to that of Tyr83... 

Figure 39 X-ray crystal structure of the cation of [Cu(HL )]4(N03)2Cl2 I.25H2O (108). (Reprinted with permission from 98IC3553, Copyright 1998, American Chemical Society.)...

Figure 3.23 X-ray crystal structure of [ CuCl(p-[18]ane-S6) J, a coordination polymer in which two different [18]ane-S6 conformers, one bis (bidentate) and one bis(monodentate) bridge Cu(I) centres (H atoms omitted for clarity).

Figure 5.11 X-ray crystal structure of the Cu(N03)2 complex of the zwitterionic salicylaldoxime 5.28 showing the axial binding of N03 to copper supported by hydrogen bonding interactions.27...

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