Synthesis and X-ray crystal structure determination of a novel chiral heteropolyanion: The 3:1' octadecatungstohexaphosphate
- Univ. de Valencia (Spain)
- U.E.I. de Cristalografia Inst. Rocasolano, Madrid (Spain)
Polyoxometalates are well-known compounds, which over the past few years have received increasing attention, owed in part to the recognition of their potential in areas such as catalysis, photochemistry, and medicine, among others. Polyoxotungstophosphates constitute by far the most fertile, rapidly expanding heteropoly system, which shows an amazing structural diversity not encountered in any other heteroatom system. Most polytungstophosphates characterized thus far are obtained from rather acidic solutions (pH < 5) or result from their partial decomposition to lacunary derivatives or condensations of these lacunary species at appropriate pH. Yet, the bulk of polytungstophosphates present in weakly acidic (pH 5-7) aqueous solutions of WO{sub 4}{sup 2{minus}} and HPO{sub 4}{sup 2{minus}} remain relatively unexplored, even though their existence was reported more than a century ago. The heteropolyanions present in such nearly neutral solutions generally have a relatively high phosphorus content (W/P < 4). Two of them, namely, the (P{sub 4}W{sub 8}O{sub 40}){sup 12{minus}} and (P{sub 4}W{sub 14}O{sub 58}){sup 12{minus}} heteropolyanions, have only recently been fully characterized. There are old reports on the existence of another phosphorus-rich heteropoly compound having a W/P ratio of 3:1, thus far formulated as ((PW{sub 3}O{sub 13}){sub x}){sup 3x{minus}}, but to the authors' knowledge, nothing had been definitely established concerning either its true composition, nor its characterization in modern terms. They herein report the synthesis, complete structural characterization in the solid state (single-crystal X-ray diffraction) and in solution ({sup 31}P and {sup 183}W NMR), and experimental evidence of the chirality of a 1:3 phosphotungstate, namely, the sodium salt of the (P{sub 6}W{sub 18}O{sub 79}){sup 20{minus}} heteropolyanion.
- OSTI ID:
- 5891462
- Journal Information:
- Journal of the American Chemical Society; (United States), Vol. 112:25; ISSN 0002-7863
- Country of Publication:
- United States
- Language:
- English
Similar Records
Synthesis and characterization of some tungstoruthenate polyoxometalates derived from lacunary polytungstates. Reactivity at the ruthenium center and effects of the polytungstate ligand
Cation-directed structure changes in polyoxometalate chemistry. Equilibria between isomers of bis(9-tungstophosphatodioxouranate(VI)) complexes
Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
TUNGSTOPHOSPHATES
CHEMICAL PREPARATION
CRYSTAL STRUCTURE
ACETIC ACID
BOND ANGLE
BOND LENGTHS
CHIRALITY
MOLECULAR STRUCTURE
NMR SPECTRA
SODIUM TUNGSTATES
TUNGSTEN COMPLEXES
X-RAY DIFFRACTION
ALKALI METAL COMPOUNDS
CARBOXYLIC ACIDS
COHERENT SCATTERING
COMPLEXES
DIFFRACTION
DIMENSIONS
LENGTH
MONOCARBOXYLIC ACIDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PARTICLE PROPERTIES
PHOSPHORUS COMPOUNDS
REFRACTORY METAL COMPOUNDS
SCATTERING
SODIUM COMPOUNDS
SPECTRA
SYNTHESIS
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENT COMPOUNDS
TUNGSTATES
TUNGSTEN COMPOUNDS
400201* - Chemical & Physicochemical Properties