6 documents found, page 1 of 1
ESR STUDY OF THE COMPLEX-FORMATION BETWEEN CU(CLO4)2 AND A FUNCTIONALIZED SILIC...
Dias, N. L.; Gushikem, Y.; Moreira, J. C.; Polito, W. L.; Rodrigues, E.Made available in DSpace on 2022-04-28T17:21:56Z (GMT). No. of bitstreams: 0 Previous issue date: 1994-01-01; The formation of the complex between Cu(ClO4)2 and a silica gel surface grafted with benzimidazole groups has been investigated by ESR. The parameters of the ESR spectrum of the complex obtained are presented and used to determine the most probable immediate environment of the complex formed on the surf...
Estudo das propriedades de troca iônica e/ou adsorção da celulose e celuloses m...
Padilha, P. M.; Campos, JTS; Moreira, J. C.; Federici, C. C.Submitted by Guilherme Lemeszenski (guilherme@nead.unesp.br) on 2014-02-26T17:06:58Z No. of bitstreams: 1 WOSA1995TG79700003.pdf: 308542 bytes, checksum: ba3b7f10d3171efba667bdb669aed6bb (MD5); Made available in DSpace on 2014-02-26T17:06:58Z (GMT). No. of bitstreams: 1 WOSA1995TG79700003.pdf: 308542 bytes, checksum: ba3b7f10d3171efba667bdb669aed6bb (MD5) Previous issue date: 1995-11-01; Submitted by Vitor Silv...
Surface photochemistry: dibenzo-p-dioxin adsorbed onto silicalite, cellulose an...
Ferreira, Luís F. Vieira; Silva, José P. da; Machado, I. Ferreira; Branco, T. J. F.; Moreira, J. C.Laser-induced luminescence of argon purged and air-equilibrated samples of dibenzo-p-dioxin adsorbed onto three different solid powdered supports, silicalite, cellulose and silica, revealed the existence of both fluorescence and phosphorescence emissions at room temperature. A remarkable difference in transient absorption spectra was found when dibenzo-p-dioxin was included within the narrow internal channels o...
Surface photochemistry: photodegradation study of pyrene adsorbed onto microcry...
Oliveira, A. S.; Ferreira, Luís F. Vieira; Silva, José P. da; Moreira, J. C.Ground-state diffuse reflectance, time resolved laser-induced luminescence, diffuse reflectance laser flash-photolysis transient absorption and chromatographic techniques were used to elucidate the photodegradation processes of pyrene adsorbed onto microcrystalline cellulose and silica. Ground-state diffuse reflectance showed that on both substrates low concentrations display absorption of pyrene monomers. At h...
A diffuse reflectance comparative study of benzil inclusion within p-tert-butyl...
Ferreira, Luís F. Vieira; Machado, I. Ferreira; Oliveira, A. S.; Ferreira, M. R. Vieira; Silva, José P. da; Moreira, J. C.Diffuse reflectance and laser-induced techniques were used to access photochemical and photophysical processes of benzil in solid supports, namely p-tert-butylcalix[n]arenes with n = 4, 6, and 8. A comparative study was performed using these results and those obtained with another electronically inert support, silicalite, which is a hydrophobic zeolite. In the latter substrate, ground-state benzil has the two c...
Diffuse reflectance studies of β-phenylpropiophenone and benzophenone inclusion...
Ferreira, Luís F. Vieira; Ferreira, Margarida R. Vieira; Oliveira, Anabela S.; Branco, T. J. F.; Prata, José V.; Moreira, J. C.The formation of inclusion complexes of β-phenylpropiophenone and benzophenone with p-tert-butylcalix[4], [6] and [8]arenes (powdered solid samples) was studied with the use of diffuse reflectance techniques. Experimental evidence was obtained for inclusion in all cases. The benzophenone n → π* absorption band exhibits hypsochromic shifts with an increase of the calixarene ring aperture, providing evidence for ...