Comparative crystal-chemical analysis of binary compounds and d-block metal halides containing tetrahedral anions

Using the TOPOS structural topological program package, comparative topological analysis was performed for binary compounds and 35 d-metal halides with tetrahedral anions MX4 (M = d-metal; X = F, Cl, Br, I), which belong to 20 topological types. Atomic networks in the structures of twelve d-metal halides and nine topological types of binary compounds were found to be similar. Most variants of structural similarity found for these compounds are also typical for other anhydrous inorganic salts: orthosilicates, sulfates, molybdates, nitrates, carbonates and borates. The topological analysis of ionic matrixes (sublattices) in the structures of d-metal halides shows that 11 of 20 topological types have at least one matrix with close packing topology. The effect of ion sizes on the topology and structure-forming role of the corresponding matrices is discussed