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7 Li Quadrupole Splitting Constants for Dimeric Lithium Phenolates in Weakly Polar Aprotic Solvents
Author(s) -
Jackman L. M.,
Çizmeciyan D.
Publication year - 1996
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/(sici)1097-458x(199601)34:1<14::aid-omr821>3.0.co;2-o
Subject(s) - chemistry , quadrupole , lithium (medication) , solvation , polar , isotopes of lithium , relaxation (psychology) , solvent , diffusion , anisotropy , computational chemistry , inorganic chemistry , analytical chemistry (journal) , ion , atomic physics , organic chemistry , thermodynamics , medicine , social psychology , psychology , physics , astronomy , ion exchange , endocrinology , quantum mechanics
The 7 Li quadrupole splitting constants [QSC = (1+η 2 /3) 1/2 ( e 2 Qq zz /h )] for di‐ and tetra‐solvated dimeric lithium 2,6‐dimethyl‐ and 2,6‐di‐ tert ‐butylphenolates were determined from measurements of 7 Li and 13 C spin lattice relaxation times. After correcting for anisotropic rotational diffusion, the estimated values for the disolvated dimers are 270–280 kHz in comparison with ca . 160 kHz for the tetrasolvated species. The values of QSC are useful for determining the degrees of solvation in solutions of dimeric organic lithium compounds in pure solvents.