Stabilization of cadmium selenide molecular clusters in zeolite Y: EXAFS and x-ray diffraction studies

Journal Article · Tue Mar 28 23:00:00 EST 1989 · Journal of the American Chemical Society; (USA)

DOI:https://doi.org/10.1021/ja00189a031· OSTI ID:5240274

Moller, K; Bein, T ^[1]; Eddy, M M; Stucky, G D ^[2]; Herron, N ^[3]

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1. Univ. of New Mexico, Albuquerque (USA)
2. Univ. of California, Santa Barbara (USA)
3. E. I. du Pont de Nemours and Co., Wilmington, DE (USA)

Small ensembles of CdSe have been synthesized within the cage system of zeolite Y via ion exchange with Cd(II) and subsequent treatment with H{sub 2}Se. Cluster size and geometrical arrangements could be determined by comprehensive analysis of Cd- and Se-edge EXAFS data as well as synchrotron X-ray powder diffraction and model calculations. The uptake of Se by the zeolite and bond formation to cadmium ions with a bond length of 2.60 {angstrom} are clearly evident from EXAFS data of both absorption edges. The CdSe molecular clusters are stabilized at ambient conditions through strong interactions with the zeolite host. Rietveld analysis and EXAFS results indicate the presence of 70% of the cadmium ions at SI' and 30% at SIII. Se,O-bridged cadmium dimers and Cd{sub 4}O{sub 4} cubes are formed in the sodalite unit. Cadmium ions present in 12-ring windows are coordinated to one Se and additional oxygen atoms. Small amounts of Se helical chains and CdSe clusters are also detected.

• DOE Contract Number: AS05-80ER10742
• OSTI ID: 5240274
• Journal Information: Journal of the American Chemical Society; (USA), Journal Name: Journal of the American Chemical Society; (USA) Vol. 111:7; ISSN 0002-7863; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION
BREMSSTRAHLUNG
CADMIUM COMPOUNDS
CADMIUM SELENIDES
CHALCOGENIDES
CHEMICAL ANALYSIS
COHERENT SCATTERING
DATA
DIFFRACTION
ELECTROMAGNETIC RADIATION
EXPERIMENTAL DATA
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
MINERALS
MOLECULES
NONDESTRUCTIVE ANALYSIS
NUMERICAL DATA
POWDERS
RADIATIONS
SCATTERING
SELENIDES
SELENIUM COMPOUNDS
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
SYNCHROTRON RADIATION
X-RAY DIFFRACTION
X-RAY EMISSION ANALYSIS
X-RAY FLUORESCENCE ANALYSIS
ZEOLITES