NDLI: Cluster self-organization of germanate systems: Suprapolyhedral precursor nanoclusters and self-assembly of CAN-Na$_{8}$(Al$_{6}$Ge$_{6}$O$_{24}$)Ge(OH)$_{6}$(H$_{2}$O)$_{2}$ and CAN-Cs$_{2}$Na$_{6}$(Al$_{6}$Ge$_{6}$O$_{24}$)Ge(OH)$_{6}$) zeolite crystal structures re]20100419

Content Provider	Springer Nature Link
Author	Ilyushin, G. D. Blatov, V. A. Dem’yanets, L. N.
Copyright Year	2011
Abstract	Geometrical and topological analysis of zeolite crystal structures having a tetrahedral framework of the cancrinite (CAN) type, namely, (CAN) Na$_{8}$(Al$_{6}$Ge$_{6}$O$_{24}$)Ge(OH)$_{6}$(H$_{2}$O)$_{2}$ (acentric space group P6$_{3}$, hP64, Na-CAN) and Cs$_{2}$Na$_{6}$(Al$_{6}$Ge$_{6}$O$_{24}$)Ge(OH)$_{6}$ (P6$_{3}$, hP52, CsNa-CAN), is carried out with the use of computer techniques (the TOPOS 4.0 program package). An AT $_{6}$ hexapolyhedral precursor nanocluster centered with a template cation A (Na, Cs) is identified. The topological type of a two-dimensional (2D) crystalforming T-net 4.6.12, which corresponds to a uninodal semiregular Shubnikov net, is recognized. The full 3D reconstruction of crystal structure self-assembly is performed as follows: precursor nanocluster → primary chain → microlayer → microframework → … framework. The symmetry of an AT6 precursor nanocluster is described by point group 3; the symmetry axis passes through the center of the nanocluster and cation A. The coordination number (CN) of a precursor nanocluster, which characterizes the nanocluster stacking in the macrostructure, is six. In both structures, six Na atoms and a Ge(OH)$_{6}$ polyhedral species are spacers filling the voids between AT $_{6}$ precursor nanoclusters. The Ge(OH)$_{6}$ polyhedral species is characterized by four and two orientationally allowed positions in Na-CAN and CsNa-CAN, respectively. The minimal number of suprapolyhedral AT $_{6}$ precursor nanoclusters required for the 3D microframework to form is 16; that is, 96 tetrahedra are involved in microframework self-assembly.
Starting Page	1572
Ending Page	1578
Page Count	7
File Format	PDF
ISSN	00360236
Journal	Russian Journal of Inorganic Chemistry
Volume Number	56
Issue Number	10
e-ISSN	15318613
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2011-10-11
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Inorganic Chemistry
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Materials Science Inorganic Chemistry

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