Abstract
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 CuI.
Acknowledgments
The authors wish to thank Dr Stephan Hoffmann for his helpful suggestions in the X-ray data refinement.