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Carbon‐13 spin–lattice relaxation study on molecular dynamics of some penta‐ and tricarbonylchromium complexes
Author(s) -
GryffKeller Adam,
Szczeciński Przemyslaw,
Koziel Hanna
Publication year - 1990
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.1260280107
Subject(s) - chemistry , intermolecular force , anisotropy , spin–lattice relaxation , dipole , ligand (biochemistry) , relaxation (psychology) , chromium , molecular dynamics , computational chemistry , chemical physics , crystallography , molecule , nuclear magnetic resonance , organic chemistry , psychology , social psychology , biochemistry , physics , receptor , quantum mechanics , nuclear quadrupole resonance
Carbon‐13 spin–lattice relaxation times were measured for some penta‐ and tricarbonylchromium complexes of organic ligands. The chemical shift anisotropy of the carbonyl carbons was estimated to be ca. 500 ppm. The contributions of dipole–dipole and chemical shift anisotropy mechanisms to the overall relaxation were evaluated and used to determine the reorientational parameters for the ligand and carbonylchromium moieties. It seems that the internal rotation rate about the ligand—chromium bond is governed mainly by intermolecular interactions.