ISSN:
1573-935X
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
Notizen:
Abstract The low-temperature luminescence spectra of samples obtained after adsorption of naphthalene by metal-substituted type X zeolites are examined. In zeolites of the first group (LiNaX, NaX, KNaX, RbNaX, CsNaX, MgNaX, CaNaX, ZnNaX, SrNaX, and BaNaX), the luminescence spectra of all the systems studied are largely the same. In the analysis of these spectra, naphthalene molecules which are physically sorbed and those bound by donor-acceptor interaction are distinguished. In forming the adsorbed charge-transfer complex (CTC), the naphthalene molecules behave as electron donors. The elements of the zeolite lattice serve as the acceptors. With zeolites of the first group, oxidation of the anphthalene, occurring in the adsorbed phase on contact with air, is observed spectroscopically. In constrast, zeolites of the second group (CoNaX, NiNaX, CuNaX, AgNaX, and CdNaX) are characterized by individual spectra due to the formation of a CTC between the naphthalene molecule and the metal present in the lattice. None of the five systems displayed oxidation of the naphthalene on contact with air.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00528039
Permalink
