Publication Type Journal Article
Title Synthesis, molecular and supramolecular structure, spectroscopy and electrochemistry of a dialkoxo-bridged diuranyl(VI) compound
Authors Susanta Hazra Samit Majumder Michel Fleck Sasankasekhar Mohanta
Groups
Journal POLYHEDRON
Year 2008
Month April
Volume 27
Number 5
Pages 1408-1414
Abstract The synthesis, molecular and supramolecular structure, spectroscopy and electrochemistry of a dialkoxo-bridged diuranyl(VI) compound [(UO2)(2)(L)(2)(dimethylformamide)(2)] (1) derived from the Schiff base ligand H2L, obtained on condensation of 3-methoxysalicylaldehyde with 2-aminoethanol, have been described. The compound has been characterized by IR, UV-Vis, NMR and mass spectra, as well as by single crystal X-ray structure determination. The title compound crystallizes in the monoclinic P2(1)/n space group with the following unit cell parameters a = 10.5713(2) angstrom, b = 11.9895(2) angstrom, c = 12.9372(2) angstrom, beta = 102.773(3)degrees and Z = 2. The structure of 1 reveals that it is a dialkoxo-bridged dinuclear compound of uranium(VI) containing two deprotonated ligands, [L](2-), two dimethylformamide (dmf) molecules and two UO22+ centers. The coordination geometry around the uranium(VI) center is distorted pentagonal bipyramidal; two uranyl oxygens occupy the axial positions, while the basal pentagonal plane is defined by a phenoxo oxygen, two bridging alkoxo oxygens, one imine nitrogen, and one dmf oxygen. Three C-H center dot center dot center dot O type hydrogen bonds involving one uranyl oxygen, two dmf hydrogens and,the imine hydrogen link the dinuclear units into a two-dimensional network. The ESI-MS spectrum of 1 in dimethylsulfoxide exhibits two peaks at m/z = 464.17 and 927.26, which are assignable to [(UO2)(2)L2H](+) (60\%) and [(UO2)(2)LH](+) (100\%) cations, respectively. Cyclic voltammetric measurements of I reveal that the uranium(VI) center is reduced quasireversibly at E-1/2 = -1112 mV with Delta E-p = 97 mV. (C) 2008 Elsevier Ltd. All rights reserved.
DOI http://dx.doi.org/10.1016/j.poly.2008.01.029
ISBN
Publisher
Book Title
ISSN 0277-5387
EISSN
Conference Name
Bibtex ID ISI:000255050600012
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