ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Preparation and properties of chlorobromocuprates(II) A₂[CuCl_xBr_4-x]

Z. Biela and J. Gažo

Department of Inorganic Chemistry, Slovak Technical University, 880 37 Bratislava

Abstract: Compounds A₂[CuCl_xBr_4-x] (A = ethyl-, n-propyl- or n-butylammonium cation; x = 0—4) were prepared by crystallization from ethanolic solutions and by solid state interaction. Their X-ray powder diffraction patterns consisting of a small number of lines disposed in regular intervals, are identical for each series of compounds having the same cation, which means that the substances are isomorphous. The charge-transfer bands in the electronic spectra were found to be shifted to lower energies with increasing content of bromine. The character of the ligand field bands is the same for all the compounds studied. Based on the values of the energy of d—d transitions (≈13 000 and 10 800 cm^-1), the tetrahalocuprate(H) anion appears to have the D_4h symmetry. The values of the д factors calculated from the e.s.r. spectra of polycrystal-line samples are also consistent with the D_4h symmetry of homogeneous tetrahalocuprates (II).

Full paper in Portable Document Format: 351a21.pdf

Chemical Papers 35 (1) 21–29 (1981)