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Dynamic 1 H NMR spectroscopy of η 2 ‐ethylene transition metal complexes
Author(s) -
Benn Reinhard
Publication year - 1983
Publication title -
organic magnetic resonance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0030-4921
DOI - 10.1002/omr.1270211204
Subject(s) - ethylene , cyclopentadienyl complex , intramolecular force , chemistry , nickel , ruthenium , nuclear magnetic resonance spectroscopy , triphenylphosphine , olefin fiber , nmr spectra database , spectroscopy , transition metal , photochemistry , metal , crystallography , spectral line , stereochemistry , organic chemistry , catalysis , physics , quantum mechanics , astronomy
The low‐temperature 1 H NMR spectra of bis(ethylene)trimethylphosphinenickel (1), η 5 ‐cyclopentadienyl(ethylene)methylnickel (2a), bis(ethylene)‐η 5 ‐cyclopentadienylcobalt (2b), [bis(1‐ethyl‐2,4,6‐triphenylphosphorinyl)nickel] P , P ′‐nickel(ethylene) (3) and η 5 ‐cyclopentadienyl(ethylene)hydrido(triphenylphosphine)ruthenium (4) exhibit {AA′B′B} (1) {ABB′A} (2a and 2b), {ABA′B′} (3) or {ABCD} (4) spin patterns, respectively, for the complexed ethylene. A full line shape analysis including all the proton couplings was performed for the ethylene rotation in 1, 2a and 2b. In addition to olefin rotation, a reversible intramolecular β‐H‐elimination was confirmed for 4 by magnetization transfer experiments.