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Dynamic 15N NMR studies of iron phosphine complexes containing coordinated dinitrogen

✍ Scribed by Leslie D. Field; Nilay Hazari; Hsiu Lin Li; Ian J. Luck

Publisher
John Wiley and Sons
Year
2003
Tongue
English
Weight
134 KB
Volume
41
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The ^15^N‐labelled iron dinitrogen complexes trans‐[FeH(N~2~)(PP)~2~]^+^[BPh~4~]^−^ (PP = dppe, depe, dmpe) and cis‐[FeH(N~2~)(PP~3~)]^+^[BPh~4~]^−^ were prepared in situ by exchange of unlabelled coordinated dinitrogen with ^15^N~2~. ^15^N NMR chemical shifts and coupling constants are reported. The ^15^N spectra exhibit separate signals for the metal‐bound and terminal nitrogen atoms of the coordinated N~2~. The ^15^N resonances display ^15^N, ^15^N coupling as well as ^31^P, ^15^N coupling and long‐range ^15^N, ^1^H coupling when there is a metal‐bound hydrido ligand. Exchange between free and coordinated dinitrogen was monitored by magnetization transfer between ^15^N‐labelled sites using an inversion–transfer–recovery experiment. Exchange between the metal‐bound and terminal nitrogen atoms of coordinated N~2~ was also monitored by magnetization transfer and this could proceed by N~2~ dissociation or by an intramolecular process. Copyright © 2003 John Wiley & Sons, Ltd.

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