The chemistry of phosphorus–fluorine compounds. Part VIII. Synthesis and nuclear magnetic resonance spectra of tetrakisfluorophosphine derivatives of zerovalent nickel
- 1 January 1967
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc. A
- p. 1136-1139
- https://doi.org/10.1039/j19670001136
Abstract
Fluorophosphine complexes of zerovalent nickel of the type NiL4[where L = PF3, CF3PF2, (CF3)2PF, CCl3PF2,Et2NPF2, and C5H10NPF2] are readily synthesised by the reaction between nickelocene and the fluorophosphine, often under very mild conditions. This synthetic approach avoids difficulties encountered in displacement reactions using nickel tetracarbonyl which invariably lead to NiLn(CO)4–n mixtures. The i.r. and 1H- and 19F-n.m.r. spectra of the complexes are presented and unusual features of the latter are discussed. A significant low-field chemical shift (–17 to –59 p.p.m.) of the fluorine atoms directly bonded to phosphorus, which occurs on complex formation, is attributed to the availability of low-lying excited states in the phosphorus–nickel bonds.Keywords
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