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Flexible V 7 O 16 Layers as the Common Structural Element of Vanadium Oxide Nanotubes and a New Crystalline Vanadate
Author(s) -
Wörle Michael,
Krumeich Frank,
Bieri Fabian,
Muhr HansJoachim,
Nesper Reinhard
Publication year - 2002
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/1521-3749(200212)628:12<2778::aid-zaac2778>3.0.co;2-h
Subject(s) - vanadate , vanadium , materials science , vanadium oxide , element (criminal law) , nanotechnology , metallurgy , political science , law
The walls of vanadium oxide nanotubes (VO x ‐NTs) are built up by vanadate layers between which the structure‐directing template, either a primary amine or a diamine with long alkyl chain, is located. The feasibility of various exchange reactions under preservation of the tubular morphology indicates a high structural flexibility of the VO x ‐NTs. The structure of the vanadate layers appears to be the same in all tubular vanadates, as revealed by the similarity of the diffraction patterns. Plate‐like crystals of a new crystalline phase, structurally closely related to the nanotubes, have now been prepared with ethylene diamine, applying a route that is analogous to the VO x ‐NT synthesis. The single crystal X‐ray structure determination showed that this new phase has the composition (en)V 7 O 16 and crystallizes with triclinic symmetry. The structure is composed of V 7 O 16 layers between which ethylene diamine mo le cules are embedded. The V 7 O 16 layers comprise two sheets of square VO 5 pyramids and VO 4 tetrahedra that connect these sheets. The available experimental data establish that this V 7 O 16 layer also is the basic element of the VO x ‐NT wall structure. The simulated X‐ray powder diffraction pattern calculated with a corresponding structural mode for VO x ‐NTs agrees well with the observed one.