Pentacyanoferrates(II) on the surface of organomodified silica gel: The matrix effect |
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Authors: | Urbirajara Pereira Rodrigues Filho Yoshitaka Gushikem Fred Yukio Fujiwara Eduardo Stadler Valderez Drago |
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Affiliation: | (1) Centro de CiÊncias Físicas e Matemáticas, Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil;(2) Centro de CiÊncias Físicas e Matemáticas, Departamento de Física, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil;(3) Instituto de Quimica, Universidade Estadual de Campinas, CP 6154, 13081-970 Campinas, SP, Brazil |
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Abstract: | Pentacyanoferrate(II) absorbed on a silica gel surface previously modified with 3-aminopropyl and 3-imidazolylpropyl groups were characterized by13C MAS/NMR, FT-IR, Mössbauer spectroscopy, and cyclic voltammetry. FT-IR and13C MAS/NMR data indicated that the pentacyanoferrate(II) complex is bonded to the surface by the nitrogen atom of the functional group. The differences in the isomeric shifts, the quandrupole splittings and the midpoint potentials of the adsorbed complexes in comparison with the model complexes were attributed to the matrix polar effect—i.e., the interaction of the complex with polar groups on the silica surface. |
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Keywords: | Pentacyanoferrate organomodified silica gel imidazole modified silica gel aminopropyl modified silica gel pentacyanoferrate immobilized on silica gel |
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