Rapid probe of the nicotine spectra by high-resolution rotational spectroscopy
Author(s) -
JensUwe Grabow,
Santiago Mata,
José L. Alonso,
Isabel Peña,
Susana Blanco,
Juan C. López,
C. Cabezas
Publication year - 2011
Publication title -
physical chemistry chemical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.053
H-Index - 239
eISSN - 1463-9084
pISSN - 1463-9076
DOI - 10.1039/c1cp22197c
Subject(s) - rotational spectroscopy , quadrupole , hyperfine structure , isotopologue , chemistry , conformational isomerism , spectroscopy , spectral line , fourier transform spectroscopy , molecular physics , analytical chemistry (journal) , nuclear magnetic resonance , atomic physics , physics , infrared spectroscopy , molecule , organic chemistry , quantum mechanics , astronomy , chromatography
Nicotine has been investigated in the gas phase and two conformational forms were characterized through their rotational spectra. Two spectroscopic techniques have been used to obtain the spectra: a new design of broadband Fourier transform microwave (FTMW) spectroscopy with an in-phase/quadrature-phase-modulation passage-acquired-coherence technique (IMPACT) and narrowband FTMW spectroscopy with coaxially oriented beam-resonator arrangement (COBRA). The rotational, centrifugal distortion and hyperfine quadrupole coupling constants of two conformers of nicotine have been determined and found to be in N-methyl trans configurations with the pyridine and pyrrolidine rings perpendicular to one another. The quadrupole hyperfine structure originated by two (14)N nuclei has been completely resolved for both conformers and used for their unambiguous identification.
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