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Dynamics of 2‐pyrrolidone, δ‐valerolactam and ϵ‐caprolactam: Nuclear magnetic relaxation of carbon‐13 and nitrogen‐15
Author(s) -
Marchal J. P.,
Brondeau J.,
Canet D.
Publication year - 1982
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/mrc.1270190102
Subject(s) - caprolactam , relaxation (psychology) , chemistry , coupling constant , molecule , carbon fibers , proton , molecular dynamics , nitrogen , anisotropy , nuclear magnetic resonance , computational chemistry , materials science , organic chemistry , physics , nuclear physics , psychology , social psychology , particle physics , quantum mechanics , composite number , composite material
Abstract The molecular dynamics and the association of 2‐pyrrolidone, δ‐valerolactam and ϵ‐caprolactam in H 2 O and CCI 4 solutions have been investigated by 13 C nuclear magnetic relaxation. With the aim of unambiguously establishing 13 C assignments the following parameters have been measured: carbon chemical shifts, one‐bond carbon–proton coupling constants and one bond carbon–carbon coupling constants. In the particular case of 2‐pyrrolidone, the 13 C relaxation times do not provide enough information in order to study in detail the dynamics of the molecule. 15 N Relaxation for the neat liquid has proved to be a valuable complement for totally analysing the anisotropic motion of this lactam.