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Polarized absorption spectroscopy on microcrystals An essential tool for the characterization of zeolite new materials

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Marlow,  Frank
Institut für Angewandte Chemie, Rudower Chaussee 5, D-12489 Berlin-Adlershof, Germany;
Research Group Marlow, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Kornatowski,  J.
Institut für Brennstoffchemie und physikalisch-chemische Verfahrenstechnik der RWTH, D-52074 Aachen, Germany;
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

Marlow, F., Hoffmann, K., Lindner, G.-G., Girnius, I., van der Goor, G., Kornatowski, J., et al. (1996). Polarized absorption spectroscopy on microcrystals An essential tool for the characterization of zeolite new materials. Microporous and Mesoporous Materials, 6(1), 43-49. doi:10.1016/0927-6513(95)00083-6.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0024-2759-7
Abstract
The application of polarized absorption spectroscopy as a powerful method in the characterization of modified zeolitic molecular sieve crystals can supply information on (i) the electronic states, (ii) the alignment of zeolite-hosted colouring guests, and (iii) the concentration of the colouring species at very low loadings. The following examples are reported for modifications brought about during the synthesis: the isomorphous framework substitution (CoII in AIPO4-5), the incorporation of ions (Se2 anions in cancrinite), and the encapsulation of metal complexes (cobalticinium, [CoIII(ν5-C5H5)2]+ in nonasils). The adsorption of chromophores (p-nitrodimethylaniline in AlPO4-5) is shown as an important post-synthesis modification.