Cuprous selenide

Electrical conduction and the diffusion of copper vacancies in non-stoichiometric cuprous selenide was studied at 500 to 850C. It was found that the diffusion constant of the Cu vacancies had extremely high absolute values. Its temperature dependence could be described by ... 

Enantioselective conversions of aryl benzyl selenides to N-tosylselenimides 28 with [(tosylimino)iodo]benzene, cuprous triflate, and the chiral bis(oxazo-line) 22 have recently been demonstrated (Scheme 16) [37,38]. Because benzyl phenyl selenide undergoes uncatalyzed imidation with Phi = NTs in acetonitrile (46 % yield) or dichloromethane (trace yield), toluene was selected as the solvent for the asymmetric imidation reactions. Furthermore, in order to avoid racem-ization of 28 by moisture, molecular sieves were added to the reaction medium. 

Cuprous selemde, Cu2Se.—The selenide occurs as the mineral berzelianite. It is produced by direct combination of copper and selenium-vapour, and is a dimorphous substance of stccl-grey colour, the transition-point for the two forms being 110° C. At 20° C. its specific heat is 0-1047,3 and its heat of formation 20-8 Cal ... 

Cuprous chloride CuCl Formamides from amines NH -> NCHO with carbon monoxide s. 26, 282 with hydrogen selenide-triethylamine instead of CuCl as catalyst cf. K. Kondo, N. Sonoda, and H. Sakurai, Chem. Commun. 7975, 853 ... 

The electrodeposition of copper indium selenide and telluride was discussed by Bhattacharya and Rajeshwar (66). The deposition solutions were made in a multistep process. A 0.5 M solution (A) of indium chloride was prepared. The copper solution (B) was prepared from cuprous chloride dissolved in 30 ml of triethanolamine, 40 ml of 30% ammonia and 150 ml of water. The copper concentration was 0.5 M. Solutions A and B were mixed in equal amounts, diluted 10 times and adjusted to pH 1 with HCI. This solution (C) was aged for 24 hrs. The actual deposition bath was made from 20 ml of either 0.1 M selenium oxide or 0.1 M tellurium oxide and 60 ml of solution C. The triethanolamine was added to the copper solution as a complexing agent to shift the deposition potential. Depositions were carried out at -1.0 volt versus a saturated calomel electrode. The initial current density was 12 mA/cm . 

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