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Research article - Peer-reviewed, 2019

A K-edge P XANES study on phosphorus compounds in solution

Persson, Ingmar; Klysubun, Wantana; Lundberg, Daniel

Abstract

The K-edge X-ray absorption near-edge structure (XANES) spectra of 19 phosphorus-containing compounds have been measured in solution. The energy at maximum intensity of the primary phosphate peak, regardless of chemical species, is 2154.5 +/- 0.4 eV. A few of the compounds studied feature XANES spectra which are conceivably characteristic enough to be used as positive identifiers in solution, including O,O-diethyldithiophosphate, (C2H5O)(2)PS(SH), triphenylphosphine oxide, (C6H5)(3)PO, and triphenylphosphite (C6H5O)(3)P. However, most spectra are near-identical or similar enough to another compound to prohibit any useful quantification analysis. The narrow range of absorption edge energy, and all phosphorus compounds studied have an absorption edge at higher energy than elemental phosphorus (red phosphorus). This shows that the electron density of phosphorus in these compounds is lower than in elemental phosphorus, and the conventional use of oxidation numbers cannot be applied. (C) 2018 Published by Elsevier B.V.

Keywords

Phosphorus K-edge XANES; Inorganic and organic phosphates; Organophosphorus compounds

Published in

Journal of Molecular Structure
2019, volume: 1179, pages: 608-611

Authors' information

Swedish University of Agricultural Sciences, Department of Molecular Sciences
Klysubun, Wantana
Synchotron Light Research Institute (SLRI)
Lundberg, Daniel
Swedish University of Agricultural Sciences, Department of Molecular Sciences

UKÄ Subject classification

Physical Chemistry

Publication Identifiers

DOI: https://doi.org/10.1016/j.molstruc.2018.11.059

URI (permanent link to this page)

https://res.slu.se/id/publ/97280