LI-7 QUADRUPOLE SPLITTING CONSTANTS FOR DIMERIC LITHIUM PHENOLATES INWEAKLY POLAR APROTIC-SOLVENTS

The Li-7 quadrupole splitting constants [QSC = (1 + eta(2)/3)(1/2)(e(2 )Qq(zz)/h)] for di- and tetra-solvated dimeric lithium 2,6-dimethyl- a nd 2,6-di-tert-butylphenolates were determined from measurements of Li -7 and C-13 spin lattice relaxation times, After correcting for anisot ropic rotational diffusion, the estimated values for the disolvated di mers are 270-280 kHz in comparison with ca, 160 kHz for the tetrasolva ted species, The values of QSC are useful for determining the degrees of solvation in solutions of dimeric organic lithium compounds in pure solvents.