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Importance of complex formation and contact shifts in the application of lanthanide shift reagents to 1H and 13C nmr spectra of aromatic compounds

✍ Scribed by Kazuo Tori; Yohko Yoshimura; Masatsune Kainosho; Katsumi Ajisaka

Publisher: Elsevier Science
Year: 1973
Tongue: French
Weight: 262 KB
Volume: 14
Category: Article
ISSN: 0040-4039
DOI: 10.1016/s0040-4039(01)96336-1

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✦ Synopsis

Much evidence has been provided for the presence of contact-term contribution to paramagnetic shifts induced by lanthanide shift reagents (1) in 'H, 13C, 14N, 19F, and 3'P NMR spectroscopy (2,3). Conspicuous effects of contact shifts (C.S .) have been observed in 13C NMR spectra of stronger Lewis bases complexed with several shift reagents, particularly some fluorinated chelates as stronger Lewis acids (2-5).

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