TYPES OF CATIONIC COMPLEXES BASED ON OXO- CENTERED TETRAHEDRA [OM4] IN CRYSTAL-STRUCTURES OF INORGANIC-COMPOUNDS

Crystal structures of inorganic compounds containing cationic complexe s with oxygen atoms inside a tetrahedron of metal atoms, or oxygen-cen tered groups [OM4], are reviewed. Types of a linkage of [OM4] tetrahed ra into the structures were analysed, and a number of the differently built cationic complexes were identified. Rules for a linkage of [OM4] tetrahedra were formulated, and a detailed systematics of the cationi c complexes in inorganic crystals was derived on their ground. A forma tion and a linkage of oxo-centered tetrahedra in most of the crystal s tructures were considered for a first time. Statistics of bond distanc es and bond angles in [OM4] tetrahedra was discussed.