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14 N NMR spectra of molecular nitrogen in SDS/pentanol swollen lamellar phases
Author(s) -
Pellizer Giorgio,
Asaro Fioretta
Publication year - 2008
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.2299
Subject(s) - chemistry , lyotropic , lamellar structure , nmr spectra database , quadrupole , spectral line , dodecane , liquid crystal , heptane , analytical chemistry (journal) , crystallography , organic chemistry , phase (matter) , liquid crystalline , physics , atomic physics , astronomy , optics
14 N NMR spectra of air dissolved in lyotropic mesophases are reported. In order to observe the whole spectrum from a molecule in which the quadrupole coupling constant is on the order of a few megahertz, a weak alignment degree with respect to the magnetic field is mandatory. Therefore, dilute lyotropic liquid crystals, namely sodium dodecylsulphate (SDS)/pentanol swollen lamellar phases, were considered. The temperature dependence of the 14 N quadrupolar splitting was followed both in the case of oil (either n ‐dodecane or n ‐heptane) and brine (a 0.2‐ M NaBr water solution) swelling. In the former, it paralleled the temperature dependence of the splittings of the alkane deuteria and, in both cases, it was opposite to 23 Na quadrupolar splittings. Owing to the higher N 2 solubility in hydrocarbons, the 14 N NMR spectra provide complementary information to that obtained by means of the quadrupolar nuclei of water and hydrophilic solutes. Copyright © 2008 John Wiley & Sons, Ltd.