Abstract
The isotherms of adsorption of CuX 2 (X=Cl −, Br −, ClO − 4) by silica gel chemically modified with 2-aminothiazole were studied in acetone and EtOH solutions, at 25°C. The 2-aminothiazole molecule, covalently bond to the silica gel surface, adsorbs CuX 2 from solvent by forming a surface complex. At low loading, the electronic and E.S.R. spectral parameters indicate that the Cu 2+ complexes have a distorted tetragonal symmetry. The d–d eletronic transition spectra show that for ClO − 4 complex, the peak of absorption do not change for any degree of metal loading whilst for Cl − and Br − complexes, the peak maxima shift to higher energy with lower metal loading.
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