PROPERTIES OF COORDINATION SEQUENCES AND CONCLUSIONS REGARDING THE LOWEST POSSIBLE DENSITY OF ZEOLITES

The topology of framework structures may be characterized by coordination sequences. It is shown that the information contained in these sequences is expressible in terms of two or three parameters. From diagrams involving such parameters it may be concluded that zeolites with densities considerably lower than those presently known would either contain three-membered rings or would have T-atoms connected to more than three four-membered rings. There are arguments against the realization of such properties, and zeolites of essentially lower densities will possibly not be found. © 1979.