Crystal structure and spectra of the complex Eu(p-ClC6H4COO)(3)C12H8N2

The europium p-chlorobenzoate complex with 1,10-phenanthroline was synthesized in the ethanol solution. The crystal structure of the complex, Eu(p-CIBA)(3) . phen(p-CIBA: p-chlorobenzoate, phen: 1,10-phenanthroline), was determined by the X-ray diffraction. The complex crystalizes in triclinic, space group <P(1)over bar> with a=1.0054(2), b=1.1858(3), c=1.4349(7); nm, alpha=110.52(3), beta=96.52(3), gamma=101.95(2)degrees, V=1.5348(8) nm(3), z=1, D-x=1.729 g/cm(3), M(r) =1597.72, T=299+/-1 K. The coordination number of the europium ion is eight. The coordination geometry of the Eu3+ ion is a distorted square antiprism. In the F-7(0)-->D-5(0) excitation spectrum of the complex, there is one sharp peak at 580.04 nm. This shows that the complex has one Eu3+ site only. D-5(0)-->F-7(j)(j=1 similar to 4) luminescence spectra have been obtained by the selectively excited D-5(0) level of the complex, which indicates that Eu3+ ions in the complex have equally chemical environments. Raman spectrum shows more than one coordination modes for the carboxylate groups in the complex. This is in agreement with the results of the structure determination.