Framework structures derived from a novel type of trigonal secondary building unit with on-axis T atoms: the tridymite group

Autor:	K. J. Andries, H. J. Bosmans
Rok vydání:	1990
Předmět:	Crystallography Molecular geometry Tridymite Structural Biology Group (periodic table) Chemistry Atom Mineralogy Crystal structure Symmetry (geometry) Cristobalite Unit (ring theory)
Zdroj:	Acta Crystallographica Section A Foundations of Crystallography. 46:832-847
ISSN:	0108-7673
DOI:	10.1107/s0108767390005591
Popis:	An infinite series of secondary building units generated around a trigonal axis, with the top and/or bottom T atom coinciding with the symmetry axis allows the systematic enumeration of a novel class of (4; 2)-connected 3D framework structures. Known members of this group are the framework topologies of tridymite, cristobalite, MAPSO-46 (AFS), CoAPO-50 (AFY) and beryllophosphate-H (BPH). Adjacent T atoms on a trigonal axis with a T-O-T bond angle of 180° (T2 unit) present in all structures confer some specific properties on this class of compounds.
Databáze:	OpenAIRE
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