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Rotational dynamics of flexible‐chain molecules. 13 C NMR relaxation study of hydrocarbon chains attached to a heavy anchor
Author(s) -
Dais Photis
Publication year - 1989
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.1260270111
Subject(s) - chemistry , hydrocarbon , degree of unsaturation , chain (unit) , benzophenone , molecule , moiety , relaxation (psychology) , molecular dynamics , side chain , stereochemistry , computational chemistry , crystallography , chemical physics , polymer chemistry , polymer , organic chemistry , physics , psychology , social psychology , astronomy
Abstract 13 C spin‐lattice relaxation times ( T 1 ) were measured for resolved carbons in flexible‐chain molecules consisting of a hydrocarbon chain attached to benzophenone at the para position. Effective correlation times, t eff , were determined from T 1 data and used to discuss the motional features of these molecules as a function of chain length, chain unsaturation and type of linkage by which the chain is attached to the benzophenone moiety. Of particular interest is the finding that the overall motion and chain mobility are greatly affected by the introduction of an unsaturated bond in the chain, depending on its configuration and location in the hydrocarbon tail.