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Volumn 32, Issue 4, 1993, Pages 610-612

Vanadium Phosphate Framework Solid Constructed of Octahedra, Square Pyramids, and Tetrahedra with a Cavity Diameter of 18.4 Å

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Indexed keywords

EID: 33748242230 PISSN: 05700833 EISSN: 15213773 Source Type: Journal
DOI: 10.1002/anie.199306101 Document Type: Article

Times cited : (130)

References (32)

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29
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- 2O in a mol ratio of 0.95:1:2.79:7.33:6.73:1056.5 for 4 d at 200°C in a 23 mL Teflon‐lined Parr acid digestion bomb (30% fill volume) gives two products. Phosphate 1 formed as dark blue, diamond‐shaped plates in over 80% yield (based on total V), while the amorphous white product was formed in less than 20% yield. We were unable to optimize these reaction conditions to reduce the amount of the side product.

30
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- 3, groups over two positions; the disorder was modelled by fixing the N‐population parameters at each site as 0.75 and 0.25, respectively. The other organic cations were disordered at the inversion centers and modelled as rigid groups with CC distances of 1.48(2) Å and CN distances of 1.41(2) Å. The disorder of the groups is evident in the large thermal parameters associated with these cations. Such behavior is not uncommon in structures of this type since the cations reside in large cavities and possess considerable freedom of motion. All other parameters are unexceptional. Hydrogen atom position could not be located on the final difference Fourier maps. Hydrogen atoms, excluding those of the phosphate OH groups, which have not been introduced either in a calculated or observed positions, were placed in their calculated positions and constrained to ride on their associated carbon or nitrogen atoms. Further details of the crystal structure investigation may be obtained from the Fachinformationszentrum Karlsruhe, Gesellschaft für wissenschaftlich‐technische Information mbH, D‐W‐7514 Eggenstein‐Leopoldshafen 2 (FRG) on quoting the depository number CSD‐56810, the names of the authors, and the journal citation.

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