Uranyl ion complexes with long chain aminoalcoholbis(phenolate) [O,N,O,O′] donor ligands
作者:Harri Sopo、Ari Väisänen、Reijo Sillanpää
DOI:10.1016/j.poly.2006.08.006
日期:2007.1
The reaction between uranyl nitrate hexahydrate and phenolic ligand precursor [(N,N-bis(2-hydroxy-3,5-dimethylbenzyl)-4-amino-1-butanol) center dot HCl], H(3)L1 center dot HCl, leads to a uranyl complex [UO2(H(2)L1)(2)] (1a) and [UO2(H(2)L1)(2)] center dot 2CH(3)CN (1b). The ligand [(N,N-bis(2-hydroxy-5-tert-butyl-3-methylbenzyl)-4-amino-1-butanol)H(3)L2 center dot HCl], H(3)L2 center dot HCl, yields a uranyl complex with a formula [UO2(H(2)L2)(2)] center dot CH3CN (2). The ligand [(N,N-bis(2-hydroxy-3,5-dimethylbenzyl)-5-amino-1-pentanol) center dot HCl], H(3)L3 center dot HCl, produces a uranyl complex with a formula [UO2(H(2)L3)(2)] center dot 2CH(3)CN (3) and the ligand [(N,N-bis(2-hydroxy-5-tert-butyl-3-methylbenzyl)-5-amino-1-pentanol) center dot HCl], H(3)L4 center dot HCl, leads to a uranyl complex with a formula [UO2(H(2)L4)(2)] center dot 2CH(3)CN (4). The ligand [(NN-bis(2-hydroxy-5-tert-butyl-3-methylbenzyl)-6-amino-1-hexanol) center dot HCl], H(3)L5 center dot HCl, leads to a uranyl complex with a formula [UO2(H(2)L5)(2)] center dot 4toluene (5). The complexes 1-5 are obtained using a molar ratio of 1:2 (U to L) in the presence of a base (triethylamine). The molecular structures of 1a, 1b, 3, 4 and 5 were verified by X-ray crystallography. All complexes are neutral zwitterions and have similar centrosymmetric, mononuclear, distorted octahedral uranyl structures with the four coordinating phenoxo ligands in an equatorial plane. In uranyl ion extraction studies from water to dichloromethane with ligands H(3)L1 center dot HCl-H(3)L5 center dot HCl, ligands H(3)L1 center dot HCl, H(3)L4 center dot HCl and H(3)L5 center dot HCl are the most effective ones. (c) 2006 Elsevier Ltd. All rights reserved.