Investigations and syntheses of meso- and microporous sulfides and selenides received in general much less attention than those of silicate and oxide families. Moreover, data on such compounds are scattered over sizable literature and it is very difficult to give a qualified overview of the subject. Scanning potential candidates in crystal structure databases leads in most cases to chain and layer structures, usually with only one or two microporous and a rare mesoporous structure in the entire list of compounds with the given promising three-element combination involving a large cation, an octahedral, tetrahedral or linear cation and an anion. In...

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