ACCURATE DETERMINATION OF H-1 KNIGHT-SHIFTS IN MG2NIHX AND MGHX BY MEANS OF HIGH-SPEED MAGIC-ANGLE-SPINNING

H-1 Knight shifts in Mg2NiHx and MgHx have been accurately determined by use of high-speed magic-angle-spinning NMR, which can reduce the li ne width caused by bulk magnetic susceptibility and dipole-dipole inte raction. The shift values were -10.7 ppm, -4.1 ppm, 4.6 ppm and 0.9 pp m from neat tetramethylsilane for alpha-Mg2NiHx, beta-Mg2NiH4, alpha-M gHx, and beta-MgH2, respectively. Deuterium dilution applied to beta-M g2NiH4 successfully reduced the dipolar line width, and no isotope eff ect was observed in the shift.