Copper structural data

Study of the relationship between the structural data and magnetic interaction in cxo-bridged binu-cleaT copper(II) compounds. M. Melnik, Coord. Chem. Rev., 1982,42,259-293 (147). 

Chemical analyses were performed by ICP at the Vemaison Center of Chemical Analysis of the CNRS. XRD patterns were obtained on a diffractometer with a copper anode. Scan was taken at 28 rate of 0.2°/min and structural data for reference compounds were taken from the ASTM X-ray powder data file. 

ATP-dependent Ca2+ pumps and Na+,Ca2+ antiporters act in concert to maintain a low concentration of free cytosolic Ca2+ 79 The uniquely high resolution structural data available for the SERCAla Ca2+ pump illuminates the structure of all P-type transporters 81 P-type copper transporters are important for neural function 82... 

Atxl chaperone apoprotein (without copper) shows tertiary structural differences in the loop area containing the cysteine ligand residues. Structural data for the apoprotein are deposited with PDB code 1FES.116... 

The d-d spectra of copper(II) compounds have provided a fruitful field for practitioners of the AOM. A wealth of structural data is available, and a rich variety of coordination geometries has been revealed. If we can make allowance for the dependence of the AOM parameters on the intemuclear distance, we are provided with excellent opportunities to test the validity of AOM parameters over a range of related systems. However, the progress of such studies over the years has illustrated the fact that a simple model may be very successful in explaining a limited amount of dubious experimental data as more crystal structures appear and as better spectroscopic data become available, the simple model may require considerable refurbishment, perhaps to the extent that it loses some of its appeal and utility. 

To date, only limited work has been reported on models for dishing and erosion in copper structures most work has been experimental in nature and report underlying pattern dependencies [13,33,51]. For example. Pan et al. [32] show experimental data based on electrical and profilometry measurements across a variety of test structures with different density, line width, and line spacing an example plot is shown in Fig. 31 where both dishing and erosion is clearly present. 

A thorough discussion of the square-planar copper oxide compounds has been presented by Miiller-Buschbaum (101). This excellent review presents structural data for some 25 ternary copper oxides. 

Having elucidated, in combination with X-ray structural data, the characteristics of the copper site coordination in blue proteins in extenso, the challenge for EPR spectroscopy (and other techniques) is now to find ways to model the electron transfer (ET) in a realistic fashion. At present EPR is, however, mostly used to ascertain that the coordination of copper in the experimental ET chain models employed is not disturbed prior to ET. Plastocyanin is the electron carrier in photosynthesis. Indications of structural origins of impaired ET in... 

Table 28 The Crystal Structure Data for Two Static Copper(II) Structures at a Range of Temperatures for a-[Cu(HC02)2] Neutron Diffraction Using Powder Profile Analysis569,570...

No structural data are available for silver(H) pyridine salts. Based on the evidence500 of ease of doping at all levels of the silver and copper persulfate complexes into the cadmium spedes, isomorphism was assumed. X-Ray powder photographs have since shown this not to be the case.499... 

Melnik and Parish (10) correlated 197Au Mossbauer and X-ray structural data for gold clusters in 1986, and Salter (11) has recently published a review of the stereochemical nonrigidity exhibited in solution by the metal skeletons of some mixed-metal clusters containing copper, silver, and gold. 

It should be pointed out that for all of these fluxional copper(II) systems the temperature variable crystal structure data does not distinguish between a dynamic and static disorder561 of the CuL6 chromophores (see Ref. 21, Table 4). 

A diamondoid architecture also results when Zn(CN)2- is reacted with Cu(I). The resulting anionic network might be viewed as tetrahedral zinc nodes linked to tetrahedral copper nodes by cyanide spacers, however the nature of coordination at the copper and zinc ions remains unclear. Analysis of the structural data indicated that it is most appropriate to consider the coordination of the copper as 100% organometallic (Cu-C) and the coordination of the zinc 100% metal-organic (Zn-N). The ionic nature of this particular framework means that the presence of a counterion in the resulting cavities is required. Indeed, N(CH3)4 fits comfortably inside the adamantoid cavity and precludes interpenetration. 

---