1H NMR study of lithium d

Add time:08/08/2019    Source:sciencedirect.com

Polycrystalline d-lactic acid lithium salt [(R)-2-hydroxypropanoic acid lithium salt, lithium d-lactate] has been investigated by pulsed proton magnetic resonance methods between 77 and 300 K at 25 MHz. The main relaxation mechanism is methyl rotation; the motion is characterized by an activation energy Ea = 14.5 ± 0.5 kJ/mol and time factor τ0 = (1.5 ± 0.5) × 10−13, s. The activation energy is higher than the potential barrier obtained by ESR and ENDOR techniques for methyl rotation in the lactate radical. The methyl rotation is also responsible for a reduction of the dipolar second moment. Below 100 K the reduction of the dipolar second moment is ascribed to quantum-mechanical tunneling; an excitation energy of 6.1 ± 1 kJ/mol is derived from a contribution to the spin-lattice relaxation times from the tunneling.

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