Applications of super(95)Mo NMR spectroscopy. XI. super(95)Mo, and super(17)O relaxation times, quadrupole coupling constants, and the molybdenum relaxation mechanism in Mo(CO) sub(6)

Spin-lattice relaxation times (Ti's) of super(95)Mo, super(97)Mo, super(17)O, and super(13)C for Mo(CO) sub(6) in CDCl sub(3) are reported. The rotational correlation time of the molecule is obtained from the chemical-shift anisotropy relaxation of super(13)C. Quadrupole coupling constants are calculated for super(95)Mo, super(97)Mo, and super(17)O. The results indicate that super(95)Mo and super(97)Mo relaxation is entirely quadrupolar and is caused by rotational reorientation of a permanent quadrupole coupling constant than from solvent molecule collisions and vibrationally induced momentary electric field gradients.