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Cr3+in AlPO4-5: Single crystal u.v.-vis spectroscopy of as-synthesized and modified crystals

Authors
Journal
Zeolites
0144-2449
Publisher
Elsevier
Publication Date
Volume
19
Identifiers
DOI: 10.1016/s0144-2449(97)00069-9
Keywords
  • Cr:Alpo4-5
  • Molecular Sieve
  • Single Crystal Absorption Spectroscopy
  • Ccd Array Spectrometer

Abstract

Large Cr:AlPO 4-5 single crystals have been characterized by microcrystal absorption spectros copy using a CCD array spectrometer and a fiber optics technique. For Cr 3+ in AlPO 4-5 crystals a polarization-dependent absorption is observed. This indicates an anisotropic coordination of Cr 3+ distorted by the molecular sieve structure. Polarized absorption measurements on Cr: AlPO 4-5 crystals loaded with p-nitrodimethyl aniline (pNDMA) and with p-nitroaniline (pNA) show a strong alignment of the guest molecules in the pore system parallel to the straight channels. The reduced ability to adsorb large molecules into the channels of the Cr:AlPO 4-5 crystals supports the hypothesis of the nonframework incorporation of Cr 3+.

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