A luminescent copper(I) bromide complex chelated with 4,5- bis (diphenylphosphano)-9,9-dimethyl-xanthene

The 1 : 1 molar-ratio reaction between copper(I) bromide and 4,5-bis(diphenylphosphano)-9,9-dimethyl-xanthene (xantphos) in acetonitrile results in the formation of [CuBr(xantphos)], which displays luminescent emission at room temperature. The molecular structure of the complex, established by single-crystal X-ray diffraction, features a trigonal planar geometry around the metal center, with the diphosphane acting as a chelate. The high rigidity and steric requirements of the xanthene unit rationalize the unusual coordination number of Cu^I.     

Structure and redox properties of the bis(1,5-diphenylformazan)copper(I) cation

The preparation is described of a novel type of formazan complex, the bis(1,5-diphenylformazan)copper(I) cation. The crystal structure of its perchlorate salt has been cleared by an X-ray study. Copper(I) forms 5-membered rings with each of two bidentate, non-ionized formazan molecules. The coordination polyhedron of copper is a distorted tetrahedron. The coordination in the oxidized product of the copper(I) complex in ethanol has been obtained from the ESR spectrum. The redox reactions of the copper(I) complex have reinforced an earlier interpretation of the mechanism of copper(II) oxidation of formazans via coordination of neutral formazan.     

Oxidation of bis(4-toluenesulphonyl-L-serinato)copper(II) to bis(formylglycine)copper(II)

Summary Oxidation of L-serine occurs on degradation of bis(L-serinato)copper(II) and at the same time copper is reduced.     

Solubility of copper (I) bromide in aqueous solutions of potassium bromide

The solubilities of cuprous bromide were measured at 24.8°C in aqueous KBr and in aqueous KBr-KNO₃ mixtures. The results have been analyzed to give equilibrium constanns from formation of neutral and negatively charged complexes of CuBr, and sets of virial parameters suitable for calculation of activity coefficients for the complexes.