Premium
Solvent versus substituent effects on the nitrogen NMR shielding of the nitro‐group in substituted benzenes
Author(s) -
Witanowski Michal,
Sicinska Wanda,
Biedrzycka Zenobia,
Webb Graham A.
Publication year - 1993
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260311008
Subject(s) - chemistry , substituent , delocalized electron , nitrobenzene , nitro , intermolecular force , nitrogen , solvent , resonance (particle physics) , photochemistry , computational chemistry , medicinal chemistry , organic chemistry , alkyl , molecule , particle physics , physics , catalysis
Intermolecular effects are shown to induce a variation of about 5 ppm in the nitrogen NMR shieldings of aromatic nitro groups. The latter turn out to be comparable to those exerted by substituents in nitrobenzene derivatives in solutions in a given solvent. Substituent effects on the NO 2 nitrogen shielding in nitro benzenes, in a given solvent, seem to reflect contributions from the so‐called field‐inductive effects on the electron charge distribution in such systems, and are insensitive to the resonance effects concerned with the delocalized pπ‐electron systems involved.