S. Biju, D. B. A. Raj, M. Reddy
Nov 15, 2006
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Inorganic Chemistry
Abstract
New tris(heterocyclic β-diketonato)europium(III) complexes of the general formula Eu(PBI)3·L [where HPBI = 3-phenyl-4-benzoyl-5-isoxazolone and L = H2O, 2,2‘-bipyridine (bpy), 4,4‘-dimethoxy-2,2‘-bipyridine (dmbpy), 1,10-phenanthroline (phen), or 4,7-diphenyl-1,10-phenanthroline (bath)] were synthesized and characterized by elemental analysis, Fourier transform infrared spectroscopy (FT-IR), 1H NMR, high-resolution mass spectrometry, thermogravimetric analysis, and photoluminescence (PL) spectroscopy. Single-crystal X-ray structures have been determined for the complexes Eu(PBI)3·H2O·EtOH and Eu(PBI)3·phen. The complex Eu(PBI)3·H2O·EtOH is mononuclear, and the central Eu3+ ion is coordinated by eight oxygen atoms to form a bicapped trigonal prism coordination polyhedron. Six oxygens are from the three bidentate HPBI ligands, one is from a water molecule, and another is from an ethanol molecule. On the other hand, the crystal structure of Eu(PBI)3·phen reveals a distorted square antiprismatic geometry arou...