Observation of Single-Crystal-Type EPR Spectra from Monolayers of Copper-Exchanged Zeolite Na-A Crystals Assembled on Glass Plates

Autor:	Hyunsoo So, Kyung Byung Yoon, R. Linn Belford, Yun-Jo Lee, Kwang Ha
Rok vydání:	2003
Předmět:	Materials science chemistry.chemical_element Cubic crystal system Copper Spectral line Surfaces Coatings and Films law.invention Crystallography chemistry law Monolayer Materials Chemistry Molecule Physical and Theoretical Chemistry Electron paramagnetic resonance Zeolite Single crystal
Zdroj:	The Journal of Physical Chemistry B. 107:8281-8284
ISSN:	1520-5207 1520-6106
DOI:	10.1021/jp0343584
Popis:	Single-crystal-type EPR spectra were observed for microcrystals of copper(II)-exchanged zeolite Na-A assembled on glass plates when the magnetic field was perpendicular to the glass surface. Two copper species (H and D) were identified both in the powder sample and in the assembled crystals. The g z direction of species H is parallel to [001] of the cubic crystal, while that of species D is tilted 9° away from [001]. Previously, other authors assumed the g z directions of the two corresponding species to be parallel to [111]. On the basis of the g z directions, we suggest that Cu 2 + in species H is displaced 0.149 nm along [111] from the six-ring plane into the β cage and octahedrally coordinated to three zeolite oxygen atoms in the six-ring plane and three water molecules. The g z direction of Cu 2 + in species D is not compatible with site II in the six-ring plane. Species D is probably a trigonal complex with Cu 2 + displaced into the β cage and coordinated to three zeolite oxygen atoms.
Databáze:	OpenAIRE
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