Issue 5, 2015

Phosphine and phosphine oxide groups in metal–organic frameworks detected by P K-edge XAS

Abstract

Phosphine metal–organic frameworks (P-MOFs) are crystalline porous coordination polymers that contain phosphorus functional groups within their pores. We present the use of X-ray absorption spectroscopy (XAS) at the P K-edge to determine the phosphine to phosphine oxide ratio in two P-MOFs with MIL-101 topology. The phosphorus oxidation state is of particular interest as it strongly influences the coordination affinity of these materials for transition metals. This method can determine the oxidation state of phosphorus even when the material contains paramagnetic nuclei, differently from NMR spectroscopy. We observed that phosphine in LSK-15 accounts for 72 ± 4% of the total phosphorus groups and that LSK-12 contains only phosphine oxide.

Graphical abstract: Phosphine and phosphine oxide groups in metal–organic frameworks detected by P K-edge XAS

Supplementary files

Article information

Article type
Paper
Submitted
06 Nov 2014
Accepted
09 Dec 2014
First published
19 Dec 2014
This article is Open Access
Creative Commons BY license

Phys. Chem. Chem. Phys., 2015,17, 3326-3331

Phosphine and phosphine oxide groups in metal–organic frameworks detected by P K-edge XAS

F. L. Morel, S. Pin, T. Huthwelker, M. Ranocchiari and J. A. van Bokhoven, Phys. Chem. Chem. Phys., 2015, 17, 3326 DOI: 10.1039/C4CP05151C

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