Structure of cobalt (II) perchlorate adsorbed on silica gel surface chemically modified with benzimidazole molecule
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Data
1997-12-01
Autores
Dias Filho, Newton L. [UNESP]
Rodrigues, Edson
Gushikem, Yoshitaka
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Resumo
Covalently attached benzimidazole molecules on silica gel surface, ≡SiL (where L = N-propyl-benzimidazole), adsorbs Co(ClO4)2 from non-aqueous solvent by forming a surface complex according to the reaction: m ≡SiL + Co(ClO4)2 → (≡SiL)mCo(ClO4)2. The equilibrium constant and the adsorption capacity, determined by applying the Langmuir equation were b = 3.0 × 103 L mol-1 and Ns= 0.098 × 10-3 mol g-1, respectively. The metal is bonded through the nitrogen atom and the perchlorate ion is not coordinated. The ESR study indicated that the complex has essentially an octahedral geometry with tetragonal distortion, with the electrons of the four nitrogen atoms interacting with the cobalt central metal ion in the equatorial plane. Only one complex species was detected on the surface.
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Palavras-chave
Benzimidazole, Cobalt electron spin resonance, Cobalt-benzimidazole surface complex, Silica gel, Silica gel modified with benzimidazole
Como citar
Journal of the Brazilian Chemical Society, v. 8, n. 4, p. 415-419, 1997.