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Multi‐frequency, variable‐temperature and high‐pressure study of carbon‐13 spin—lattice relaxation in tetraoctyltin
Author(s) -
Gillies Duncan G.,
Matthews Stephen J.,
Sutcliffe Leslie H.
Publication year - 1991
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.1260291211
Subject(s) - chemistry , relaxation (psychology) , ambient pressure , spin–lattice relaxation , thermodynamics , lattice (music) , atmospheric temperature range , nuclear overhauser effect , alkyl , spin (aerodynamics) , nuclear magnetic resonance , analytical chemistry (journal) , nuclear magnetic resonance spectroscopy , condensed matter physics , stereochemistry , organic chemistry , paramagnetism , psychology , social psychology , physics , acoustics
Carbon‐13 NMR spin–lattice relaxation times, T 1 , and nuclear Overhauser effect data were obtained for neat tetra‐ n ‐octyltin at 22.5 and 100.6 MHz over a wide temperature range. T 1 values were also measured at 25.16 MHz at pressures up to 211 MPa. The ambient‐pressure data were fitted to the ‘model‐free’ two‐correlation time spectral density with a temperature‐dependent order parameter, S 2 . The pressure data were interpreted by assuming that internal motions of the octyl chain are independent of pressure while the overall (tumbling) motion and S 2 are pressure dependent. The values of the motional parameters for tetra‐ n ‐octyltin lie in the ranges expected for compounds containing long n ‐alkyl chains. The results show that this approach is applicable to complex liquids such as synthetic lubricants of the polydecene type.