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NMR spin–lattice relaxation time measurements in organochalcogen compounds
Author(s) -
Abel E. W.,
Orrell K. G.,
Platt A. W. G.
Publication year - 1983
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/omr.1270210311
Subject(s) - methylene , dipole , anisotropy , spin–lattice relaxation , relaxation (psychology) , chemistry , proton , molecule , proton spin crisis , lattice (music) , chalcogen , crystallography , nuclear magnetic resonance , analytical chemistry (journal) , computational chemistry , organic chemistry , physics , psychology , social psychology , quantum mechanics , acoustics
1 H and 77 Se spin‐lattice relaxation times have been measured for the series of organochalcogen compounds MeE(CH 2 ) n EMe (E=S, Se, n =0–3; E = O, n = 1, 2). The methyl and methylene proton T 1 values decreased with increasing mass/size of the chalcogen and with increasing methylene chain length. The values are primarily due to intra‐ and inter‐molecular dipole‐dipole relaxation with proton‐proton cross‐relaxation effects playing a significant role. 77 Se T 1 values are dominated by spin rotation and chemical shielding anisotropy mechanisms, their relative importance depending on the size of the molecule and temperature of measurement.