Esr Study Of Cucl2 Adsorbed On A Chemically Modified Silica Gel Surface With Benzimidazole Molecule

The ESR spectrum of CuCl2 adsorbed onto a silica gel surface chemically modified with the benzimidazole molecule showed that the surface complex has an octahedral symmetry with tetragonal distortion. The measured ESR parameters were g∥ = 2.287, g⊥ = 2.062, A∥ = 153 G and superhyperfine splitting AN = 15 G. The fit of the theoretical expressions to the experimental data was very reasonable. The effective spin orbit coupling constant for Cu2+ was reduced from its normal free ion value of λ = -828 cm-1 by as much as 30%. This reduction of λ is normal in the solid state and in frozen solution complexes. © 1995.3351-3175180Verzele, Van de Velde, (1985) Chromatographia, 20, p. 239Howard, Volkan, Ataman, (1987) Analyst, 112, p. 159Moreira, Gushikem, (1985) Anal. Chim. Acta, 176, p. 263Wasiak, (1987) Chromatographia, 23, p. 427Tundo, Venturello, Angeletti, (1982) J. Am. Chem. Soc., 104, p. 6547Kricka, Green, (1983) Trends Anal. Chem., 2, p. 244Hartley, Vezey, (1977) Adv. Organomet. Chem., 15, p. 189Collman, Belmont, Brauman, (1983) J. Am. Chem. Soc., 105, p. 7288Gushikem, Moreira, (1985) J. Colloid Interface Sci., 107, p. 70Andreotti, Gushikem, (1991) J. Colloid Interface Sci., 142, p. 97Burggraf, Kendall, Leyden, Pern, (1981) Anal. Chim. Acta, 129, p. 19Shinoda, Saito, (1982) Inorg. Chim. Acta, 63, p. 23Golubev, Kudryavtsev, Lisichkin, Mil'chenko, (1985) Russian J. Phys. Chem., 59, p. 1674Solozhenkin, Semikopnyi, Sharf, Lisichkin, (1988) Russ. J. Phys. Chem., 62, p. 218Goodgame, Haines, Copper(II) complexes of benzimidazole (1966) Journal of the Chemical Society A: Inorganic, Physical, Theoretical, p. 174Bose, Sharma, Patel, (1970) J. Inorg. Nucl. Chem., 32, p. 174Motschi, (1984) Colloids Surf., 9, p. 333Kivelson, Neiman, ESR Studies on the Bonding in Copper Complexes (1961) The Journal of Chemical Physics, 35, p. 149Dias Filho, Gushikem, Rodrigues, Moreira, Polito, Structure of copper complexes adsorbed on a silica gel surface chemically modified with benzimidazole (1994) Journal of the Chemical Society, Dalton Transactions, p. 1493Gushikem, Moreira, (1985) J. Colloid. Interface Sci., 107, p. 70Perchard, Novak, (1968) J. Chim. Phys., 65, p. 1964Cordes, Walter, (1968) Spectrochim. Acta, 24, p. 1421. , Part AReedijk, (1981) Transition Met. Chem., 6, p. 195Van Landschoot, Van Hest, Reedijk, (1980) Inorg. Chim. Acta, 46, p. 41Massacesi, Ponticelli, (1980) Transition Met. Chem.9, 5, p. 353Pappalardo, (1961) J. Mol. Spectrosc., 6, p. 554Peigneur, Lunsford, De Wilde, Schoonheydt, (1977) J. Phys. Chem., 81, p. 117