Delineation of shift reagent-substrate equilibria

R. Porter, Tobin J Marks, D. F. Shriver

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Abstract

The equilibria between Ln(fod)3 (Ln = Pr, Eu, Ho, or Yb; fod = 1,1,1,2,2,3,3-heptafluoro-7,7-dimethyloctanedionate) and the basic substrate (π-C5H5)Fe(CO)2(CN) have been studied by vapor pressure osmometry on benzene solutions. Dimers and, in some cases, higher aggregates of the shift reagents are found in pure Ln(fod)3 solutions. In general, the shift reagent : substrate systems form 1:1 and 1:2 complexes. In the case of Pr(fod)3 1:3 complex formation is also observed. The relative successive formation constants for 1:2 adduct formation decrease from light to heavy lanthanide. This, as well as the 1:3 formation with Pr(fod)3, is thought to reflect greater steric crowding with the heavier members. The osmometry results are compared with nmr shifts determined under similar conditions, and the factors determining the shapes of plots of substrate shift vs. shift reagent to substrate ratio are discussed.

Original languageEnglish
Pages (from-to)3548-3552
Number of pages5
JournalJournal of the American Chemical Society
Volume95
Issue number11
Publication statusPublished - 1973

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Osmometry
Substrates
Vapor Pressure
Lanthanoid Series Elements
Carbon Monoxide
Benzene
Rare earth elements
Vapor pressure
Dimers
Light

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Delineation of shift reagent-substrate equilibria. / Porter, R.; Marks, Tobin J; Shriver, D. F.

In: Journal of the American Chemical Society, Vol. 95, No. 11, 1973, p. 3548-3552.

Research output: Contribution to journalArticle

Porter, R, Marks, TJ & Shriver, DF 1973, 'Delineation of shift reagent-substrate equilibria', Journal of the American Chemical Society, vol. 95, no. 11, pp. 3548-3552.
Porter, R. ; Marks, Tobin J ; Shriver, D. F. / Delineation of shift reagent-substrate equilibria. In: Journal of the American Chemical Society. 1973 ; Vol. 95, No. 11. pp. 3548-3552.
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