Copper selenides

Selen-kupfer, n. copper selenide. -kupfer-silber, n. copper silver selenide (Min.) eucairite. -metall, n. metallic selenide. 

Massaccesi S, Sanchez S, Vedel J (1993) Cathodic deposition of copper selenide films on tin oxide in sulfate solutions. J Electrochem Soc 140 2540-2546... 

De Marco [285] evaluated three different types of copper (II) ion-selective electrodes. The copper sulfide electrode was found to be oxidised, whereas the copper selenide and copper sulfide electrodes were found to have chloride ion interference at copper (II) activities exceeding 10 8 M. 

Copper selenide is also used in solar cells [200]. TOPO-capped CuSe nanoparticles were synthesized from Cu(Se2CNEt2)2 using a single-source method [201]. Copper selenide nanoparticles have also been prepared and XPS spectra, valence bands and Auger transitions reported for the molecular clusters Cui46Se73(PPh(3))(202) and Cu2Se [203]. Photoemission features were reported for both species. 

Although Afzelius refused to tell where he had found the mineral, W. Hisinger said that it must have come from a deserted mine at Skrikerum in the North Kalmar district. Berzelius then found specimens of it from this locality in the collections of the Bureau of Mines. Since it had been found at an opportune time, i. e., in time to be mentioned in his original paper on selenium, he named the mineral eucairite. In the same collection he also found a still richer selenium mineral, a copper selenide which is now known as berzelianite (28). 

Crookesite. In 1866 Baron Nils Adolf Erik Nordenskiold found among the collections at the Royal Museum in Sweden a rare mineral from Skrikerum, which C. G. Mosander had regarded as a copper selenide. When Baron Nordenskiold analyzed it, he found it to be a selenide of copper, silver, and thallium. Because it was the first mineral of which the recently discovered element thallium was shown to be an essential constituent, he named it crookesite in honor of Sir William Crookes, the discoverer of thallium (31). Although crookesite is very rare, selenium and thallium are often found associated in nature, and both of these elements, so different in chemical properties, were originally discovered in the same source, namely the slime in the lead chambers of sulfuric acid plants using seleniferous and thalliferous pyrite. 

Pure silver azide explodes at 340°C, but presence of below 10% of copper or (II) oxides or sulfides, copper selenide or bismuth(III) sulfide reduces the detonation temperature to 235°C. Concentrations of 10% of copper(II) oxide, copper selenide or sulfide further reduced it to 200, 190 and 170°C, respectively. 

Alternatively polymer-bound sodium selenide 6 served as the starting point for an acylat-ing protocol (Scheme 3) [12]. Transformation into selenol ester 9 afforded an active polymer-bound intermediate which was cleaved in the presence of an alkinylcopper species to generate a,/ -alkinyl ketones 10 while the copper selenide can be reacylated using acyl chlorides. 

Cn(hfac)2 (7b) °. The qnality of the copper fihns deposited on the SAM diffusion barrier was high regarding pnrity and nniformity, comparable to that of films deposited on Si(lOO) and traditional diffnsion barriers (TiN). Copper selenide binary phases can be grown from Cn(acac)2 (7a) and trioctylphosphine selenide. Depending on the techniques applied, tetragonal Cn2Se (aerosol-assisted CVD) or cnbic Cn2 xSe nanoparticles capped with hexadecylamine (liqnid deposition) are prodnced. ... 

The 5-Br-PADAP method was applied for determining Co in blood serum [105]. Various hydrazones were used in determinations of Co in pharmaceuticals [78,106], steel [107-109], alloys [110], and catalysts [111]. PAN was used for determining Co in vitamin Bn. The PAR method has been applied in Co determinations in the presence of Ni [113-115], in water and in pharmaceuticals [116], and in copper selenide [117]. Dithizone was used for determining Co in Cu-Ni-Zn alloys [6]. 5-(Arsonophenylazo)-8-(4-toluenesulphonamido)quinoline has been used for determining Co in vegetables [118]. 

Zinc was determined in environmental samples [108] and in copper selenide [109] with the use of PAR. Zn was determined in brass (in the presence of Ni) by derivative spectrophotometry with the use of 2-(2-pyridylmethylene-amino)phenol [110]. The thiocyanate complex of Zn associated with Tetrazolium Violet has been applied for determining Zn in cadmium [1111. 

Harris, D. C., Cabri, L. J., Kaiman, S., Athabascaite a new copper selenide mineral from Martin Lake, Saskatchewan, Can. Mineral., 10, (1970), 207-215. Cited on page 634. 

Copper selenides films have been deposited and, interestingly, when starting from a copper (II) precursor, the composition of the final compound (from CuSe to CujSe) appears to depend on the initial concentratioivs of the selenide precursor concentration as also observed for CuxS [18]. 

CuSe COPPER SELENIDE 632 FeBr2 IRON DIBROMIDE 680... 

ROB/BRO] Robinson, S. C., Brooker, E. J., A cobalt-nickel-copper selenide from the Goldfields District, Saskatchewan, Am. Mineral, 37, (1952), 542-544. Cited on page 161. 

Although this strategy works well for copper-sulfide, copper-selenide, and copper telluride particles, it has not been shown that related silver- and gold-chalco-... 

General.—Liquid bismuth has been used as the solvent for calorimetry and data for the enthalpy of solution of copper, indium, and tellurium have been obtained. Enthalpy of formation data are also given for a series of copper selenides. Studies on the distribution of lithium and bismuth between liquid Li-Bi alloys and molten LiCl suggested that a salt-like species LijBi was being selectively dissolved from the alloys. The mutual solubility of thorium and the metallic lanthanides La, Nd, and Eu in bismuth over the range 350—700 °C shows evidence for the formation of solid compounds with the composition ThLnBij,. ... 

The U2S3 type of structure of Dy2Se3 has been confirmed and refined from single-crystal data. The crystal structures of a number of copper selenides have been re-examined, using powder X-ray diffraction data, and a set of structures have been proposed. ... 

Massaccesi et al. [94] studied in detail the room temperature deposition of copper selenide films onto rotating disk tin oxide electrodes from deoxygenated solutions at pH 2.45 containing ImM CUSO4, 0.1 M K2SO4, and between 0 and 10 mM H2Se03. Two Se(IV) species are present at this pH, and their reduction potentials are given below. 

Lippkow and Strehblow [95] studied the effect of temperature on copper selenide deposition from an electrolyte similar to that used by Vedel et al. and found that the Cu2Se phase was preferred when deposition was carried out at 80 C, whereas a mixed phase of Cu2Se and CuSe2 was formed at lower temperatures. 

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