Structure-determining Factors in the Absence of Hard Cations

Structure-determining Factors in the Absence of Hard Cations 

Trivalent cations are present in most of niobium oxychloride cluster compounds known to date and play an important role in their structural chemistry. The series AxNb6Cli202 (A = K, Rb, Cs, In), on the other hand, represents an example of an oxychloride structure stabilized without a trivalent counter-ion (Fig. 6.12). 

CS2Ti3(Nb6Cl,2.504)2Cl2 side view of one layer 

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