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Schlagwörter:
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Zusammenfassung:
Borophosphates (intermediate compounds of the system
MxOy-B2O3-P2O5-(H2O)) contain complex anionic structures built of BO4,
BO3, and PO4 groups and their partially protonated species,
respectively. A first approach to the development of a structural
chemistry of borophosphates is based on linking principles of the
primary building units following the general Line of silicate crystal
chemistry. The crystal structures of borophosphates are first divided
into anhydrous and hydrated phases. Further gradings are based on the
(molar) B:P ratios. The structural chemistry of borophosphate anions
already extends from isolated species, oligomers, rings, and chains to
layers and frameworks. Additional characteristics are integration of
planar BO3 groups, preferred formation of 3-membered rings, and unusual
branching of tetrahedral chains. P-O-P linking in borophosphates is not
observed up to now.
