Electron spin resonance of high-spin cobalt in microporous crystalline cobalt-containing aluminophospates

Article Abstract:

Liquid He X- and/or Q-band electron spin resonance spectroscopy have been used to investigate four cobalt-containing microporous aluminophosphates which are highly crystalline.

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Incorporation of transition metal ions in aluminophosphate molecular sieves with AST structure

Article Abstract:

Classic template, quinuclidine and the corresponding salts of V(super 4=), CO(super 2+), Cr(super 3+) and Mn(super 2+) were used for synthesizing the transition metal ion containing aluminophosphate molecular sieves with AlPO4-16(AST) structure. It was concluded that the transition metal ions like CO(super 2+) and V(super 4+) were more stable towards oxidative treatments in the AST structure as compared to other related microporous crystalline aluminophosphates.

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Theoretical study of the structure and spectroscopic properties of cobalt(II) coordinated to six-rings in zeolites

Article Abstract:

Research was conducted to examine the structure of the local Co(II) six-ring oxygen environment in zeolite A and the corresponding ligand field spectrum using large cluster models that include all six that surround Al or Si tetrahedra terminated by either OH or H groups. The optimization of structures was done using density functional theory that employed a nonlocal method. Results indicate that the observed splitting of the main band in the spectrum is caused by the presence of asymmetric coordination sites.

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