Abstract
35Cl NQR frequencies and spin-lattice relaxation time ( T 1Q) and 1H NMR relaxation times ( T 1H) in a H-bonded three molecular system, chloranilic acid–1,4-diazine (1:2) were measured to reveal H-motions in a symmetric two H-bonds in solid. A single 35Cl NQR frequency observed implies that the time-averaged structure of chloranilic acid is roughly monovalent in accordance with p K a values in both acid and base. T 1H temperature dependence was explained by a single relaxation mechanism due to the correlated H-transfer in two H-bonds, while that of T 1Q yielded two relaxation processes. One of these undetected by 1H NMR was explained by the uncorrelated H-transfer.
Published Version
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