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Structure and luminescent investigation of the Ln(III)-beta-diketonate complexes containing tertiary amides

Teotonio, Ercules E. S. and Brito, Hermi F. and de Sa, Gilberto F. and Felinto, Maria Claudia F. C. and Santos, Regina Helena A. and Fuquen, Rodolfo Moreno and Costa, Israel F. and Kennedy, Alan and Gilmore, Denise and Faustino, Wagner M. (2012) Structure and luminescent investigation of the Ln(III)-beta-diketonate complexes containing tertiary amides. Polyhedron, 38 (1). pp. 58-67. ISSN 0277-5387

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Abstract

The synthesis and photoluminescent properties of Ln(III)-thenoyltrifluoroacetonate and dibenzoylmethanate complexes (Ln = Eu(III) and Gd(III) ions) containing tertiary amides such as dimethylacetamide (DMA), dimethylformamide (DMF), and dimethylbenzamide (DMB) as neutral ligands are reported. The Ln complexes were characterized by elemental analysis, complexometric titration with EDTA, and infrared spectroscopy. Single-crystal X-ray structure data of the [Eu(DBM)(3).(DMA)] compound indicates that this complex crystallizes in the triclinic system, space group PT with the following cell parameters: a = 10.2580(3) angstrom, b = 10.3843(2) angstrom, c= 22.3517(5) angstrom, alpha = 78.906(2)degrees, beta = 78.049(2)degrees, lambda= 63.239(2)degrees, V= 2066.41(9) angstrom(3), and Z = 2. The coordination polyhedron for the Eu(III) complex may be described as an approximate C-2v distorted monocapped trigonal prism. The optical properties of the Eu(III) complexes were studied based on the intensity parameters and luminescence quantum yield (q). The values of the ohm(2) parameter of the Eu-DBM complexes are larger than those for the Eu-TTA complexes, indicating that the Eu(III) ion is in a more polarizable chemical environment in the former case. The geometries of the complexes have been optimized by using the Sparkle Model, and the results have been used to perform theoretical predictions of the ligand-to-metal energy transfer via direct and exchange Coulomb mechanisms. (C) 2012 Elsevier Ltd. All rights reserved.

Item type: Article
ID code: 41071
Keywords: Europium, β-Diketonate, tertiary amides, crystalline structures, luminescence quantum yield, Chemistry, Materials Chemistry, Physical and Theoretical Chemistry, Inorganic Chemistry
Subjects: Science > Chemistry
Department: Faculty of Science > Pure and Applied Chemistry
Related URLs:
Depositing user: Pure Administrator
Date Deposited: 11 Sep 2012 12:46
Last modified: 27 Mar 2014 10:29
URI: http://strathprints.strath.ac.uk/id/eprint/41071

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