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Type: Artigo de periódico
Title: Study of copper complexes adsorbed on a silica gel surface chemically modified with 2-amino-1,3,4-thiadiazole
Author: Dias, NL
Gushikem, Y
Franco, DW
Schultz, MS
Vasconcellos, LCG
Abstract: The isotherms of adsorption of CuX2 (X=Cl-, Br-, ClO4-) by silica gel chemically modified with 2-amino-1,3,4-thiadiazole were studied in acetone and ethanol solutions: at 298 K. The following equilibria constants (in 1 mol(-1)) were determined: (a) CuCl2: 3.5 x 10(3) (ac), 2.0 x 10(3) (eth); (b) CuBr2: 2.8 x 10(3) (ac), 2.0 x 10(3) (eth); (c) Cu(ClO4)(2): 1.8 x 10(3) (ac), 1.0 x 10(3) (eth); ac = acetone, eth = ethanol. The electron spin resonance spectra of the surface complexes indicated a tetragonal distorted structure in the case of lower degrees of metal loading on the chemically modified surface. The d-d electronic transition spectra showed that for the ClO4-, complex, the peak of absorption did not change for any degree of metal loading, and for Cl- and Br- complexes, the peak maxima shifted to a higher energy region with a lower metal loading. (C) 1998 Elsevier Science B.V. All rights reserved.
Subject: copper complex with 2-amino-1,3,4-thiadiazole
electron spin resonance of copper complexes
silica gel
silica gel modified with 2-amino-1,3,4-thiadiazole
Country: Holanda
Editor: Elsevier Science Bv
Citation: Colloids And Surfaces A-physicochemical And Engineering Aspects. Elsevier Science Bv, v. 141, n. 2, n. 181, n. 187, 1998.
Rights: fechado
Identifier DOI: 10.1016/S0927-7757(98)00333-1
Date Issue: 1998
Appears in Collections:Unicamp - Artigos e Outros Documentos

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