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HERO ID
8346407
Reference Type
Journal Article
Title
57Fe NMR of ferrocenes by 1H-57Fe INEPT techniques
Author(s)
Wrackmeyer, B; Tok, OL; Herberhold, M
Year
2001
Is Peer Reviewed?
1
Journal
Organometallics
ISSN:
0276-7333
EISSN:
1520-6041
Volume
20
Issue
26
Page Numbers
5774-5776
Language
English
DOI
10.1021/om010756m
Abstract
57Fe NMR spectra (11.66 MHz) of the sandwich complexes ferrocene (1), butylferrocene (2), and acetylferrocene (3) were measured at natural abundance of 57Fe by application of the polarization transfer technique (INEPT; 1H-57Fe). In contrast to previous assumptions this technique works very well, although it has to be based on rather small (â¼0.3-0.7 Hz) long-range scalar 57Fe-1H couplings across two bonds. Thus, the 57Fe NMR signal of ferrocene (â¼150 mg in 2 mL of CDCl3/hexane (1:1)) was observed already after 4 transients, and after 400 transients (70 min of spectrometer time) the 13C satellites (1J(57Fe,13C) = 4.7 Hz) were detected, allowing us to determine the isotope-induced chemical shift 1Î12/13C(57Fe) = -440 ppb at natural abundance of the isotopes.
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