INADEQUATE experiment zeolites

So far, the 2D INADEQUATE experiment turns out to be the method of choice with re rect to investigations of three-dimensioiud bonding connectivities within zeolitic material lattices. This approach is of general interest, since the experiments can be carried out on 29si natural abundant zeolitic material samples. 

Small amounts of water within a zeolite can have a large effect on some experiments, so complete dehydration is often necessary. A zeolite which is to be exposed to alkali-metal vapor, for example, must not be given an opportunity to resorb water fi-om other parts of its vessel after dehydration but before metal vapor sorption. The resulting metal hydroxide or oxide (additional products) could lead to the destruction of the zeolite. To compound the problem, the experimental conditions are often not described in detail in a report in the literature, so the reader can only be suspicious of a link between the reported result and inadequate dehydration. For some work, involving large amounts of powder, this problem may sometimes be of minor importance. Where tiny samples are involved, it is crucial. 

Similar agreement between the observed connectivities and those predicted from the structure are found in corresponding experiments on zeolite ZSM-22, giving further confidence in the reliability of these techniques. The demonstrated ability to perform them successfully on natural-abundance materials greatly extends their potential. In both cases, the two-dimensional INADEQUATE sequence gives superior performance and will usually be the experiment of choice. 

COSY magic angle spinning NMR experiments on silicate glasses and COSY and 2D-INADEQUATE measurements on Zeolites " . 

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