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15N NMR Spectroscopy of Cyclotriphosphazenes and Polyphosphazenes Based on31P,15N HMQC Correlations

✍ Scribed by Elvira Peláez-Arango; Francisco J. Garcı́a-Alonso; Gabino Carriedo; Fernando López-Ortiz

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
145 KB
Volume
121
Category
Article
ISSN
1064-1858

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✦ Synopsis

A 31 P and 15 N NMR study of cyclotriphosphazenes 1-4 and preparation of polyphosphazenes, and the properties of these polyphosphazene 5 has been carried out including solvent and materials can be tuned by the incorporation of different substitusubstituent effects. 15 N chemical shifts and 31 P, 15 N coupling conents into the polymeric backbone (6): stants are readily obtained through 1D and 2D 31 P, 15 N HMQC correlation spectroscopy on natural-abundance samples. This methodology combined with spectral simulation also yields 15 Ninduced isotope shifts. 31 P and 15 N are both relatively insensitive to changes in solvent polarity. Chemical shifts are reasonably explained in terms of electronic density variations, and 31 P, 15 N couplings are rationalized by considering their absolute sign, which depends on the substituent bonded to phosphorus. 15 N proved to be more sensitive to structural modifications than 31 P. Therefore, the availability of 15 N NMR data on cyclotriphosphazenes can be considered a valuable tool in the design of model compounds for polyphosphazene synthesis.

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