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

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Marlow,  F.
Research Group Marlow, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

Thiele, S., Hoffmann, K., Vetter, R., Marlow, F., & Radaev, S. (1997). Cr3+ in AlPO4-5: Single crystal u.v.-vis spectroscopy of as-synthesized and modified crystals. Zeolites, 19(2-3), 190-196. doi:10.1016/S0144-2449(97)00069-9.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0024-2729-4
Abstract
Large Cr:AlPO4-5 single crystals have been characterized by microcrystal absorption spectros copy using a CCD array spectrometer and a fiber optics technique. For Cr3+ in AlPO4-5 crystals a polarization-dependent absorption is observed. This indicates an anisotropic coordination of Cr3+ distorted by the molecular sieve structure. Polarized absorption measurements on Cr: AlPO4-5 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:AlPO4-5 crystals supports the hypothesis of the nonframework incorporation of Cr3+.