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    ISSN: 0044-2313
    Keywords: O,O′,O″,O‴-tetraaryl-μ-imido-diphosphate ; O,O′,O″,O‴-tetraaryl-μ-imido- thiodiphosphate ; O,O′,O″,O‴-tetraaryl-μ-imido-dithiodiphosphate ; preparation ; crystal structure ; NMR investigation ; sign of P—P coupling constants ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Tetraarylesters of μ-Imido-Diphosphoric Acid and its Thio Derivatives  -  Structure InvestigationsNew O,O′,O″,O‴-tetratolyl- and ditolyl-diphenylesters of the μ-imido-diphosphoric acid and its mono and dithio derivatives were synthesized, compared with the corresponding tetraphenylesters and investigated by 1H, 13C, and 31P NMR spectroscopy and X-ray crystal structure analysis. Structures of the O,O′,O″,O‴-tetrakis-(2-methyl-phenyl)-μ-imidodiphosphate, 1b, as well as of the corresponding ortho-, meta- and para-tolylesters of the μ-imido-monothiodiphosphoric acid (2a, 2b, 2c) were determined. All the compounds form dimers via N—H…O hydrogen bonds in the crystal as well as in nonpolar solvents. The distances around the phosphorus atoms rise with decreasing electronegativity of the phosphorus substituents. Signs of the 2JP—N—P coupling constants were determined by 13C{1H, 31P} triple resonance experiments for some compounds. These constants become more negative owing to substitution of a phosphoryl by a thiophosphoryl group.
    Notes: Neue O,O′,O″,O‴-Tetratolyl- und Diphenylditolyl-ester der μ-Imido-diphosphorsäure und ihres Monothio- und Dithioderivates wurden synthetisiert, in ihren Eigenschaften mit den bekannten Phenylestern verglichen und 1H-, 13C- und 31P-NMR-spektroskopisch untersucht. Die Kristall- und Molekülstrukturen des O,O′,O″,O‴-Tetrakis-(2-methyl-phenyl)-μ-imido-diphosphats, 1b, sowie der entsprechenden ortho-, meta-, und para-Tolylester der μ-Imido-monothiodiphosphorsäure (2b, 2c, 2d) konnten gelöst werden. Alle Verbindungen bilden über N—H…O-Wasserstoffbrücken Dimere, die auch in unpolaren Lösungsmitteln erhalten bleiben. Die Bindungsabstände um die P-Atome nehmen mit sinkender Elektronegativität der Substituenten zu. Durch 13C{1H, 31P}- Tripelresonanzexperimente wurde das Vorzeichen der 2JP—N—P- Kopplungskonstanten für einige Verbindungen bestimmt. Bei Substitution von Phosphoryl- durch Thiophosphorylgruppen werden diese Konstanten negativer.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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