Reply to comment on (super 27) Al multiply-quantum magic angle spinning NMR study of the thermal transformation between the microporous aluminum Methylphosphonates AIMePO-beta and AIMePO-alpha

Article Abstract:

The application of the (super 27)AI multiple-quantum magic angle spinning (MQMAS)NMR experiment to the study of aluminum methylphosphonates is defended. Demonstration of the excellent resolution that can be achieved with a five-quantum version of the experiment and the conclusion that the NMR results on a sample where the thermal transformation from the beta to the alpha polymorph was interrupted before completion do not appear to support the proposition of a topotactic reconstructive transformation is reiterated.

Nuclear magnetic resonance

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27Al multiple-quantum magic angle spinning NMR study of the thermal transformation between the microporous aluminum methylphosphonates AlMePO-beta and AlMePO-alpha

Article Abstract:

Research was conducted to examine the thermal transformation between AlMePO-alpha and AlMePO-beta using the 27Al multiple-quantum magic angle spinning NMR method. A novel split-t1 version of the basic five-quantum MAS experiment was utilized to achieve the required spectral resolution. Results based on the thermal transformation between AlMePO-alpha and AlMePO-beta are not in agreement with previous results. However, findings show that the five-quantum 27 AL MAS NMR method can derive isotropic shift parameters.

Aluminum compounds, Phosphonates

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Multiple-quantum and cross-polarized (super27)Al MAS NMR of mechanically treated mixtures of kaolinite and gibbsite

Article Abstract:

A study of the local environment of Al atoms in Kaolinite, gibbsite and their mechanochemically treated mixtures by using (super 27)Al NMR spectroscopy to investigate the newly formed chemical species. The mixtures of the clay mineral kaolinite with gibbsite when heated form mullite, a high temperature ceramic.

Usage, Nuclear magnetic resonance spectroscopy, Chemistry, Physical and theoretical, Physical chemistry, NMR spectroscopy, Kaolinite

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