Hydrogen transfer in hydrogen-bonded chloranilic acid studied by 35Cl NQR I – a 1:2 complex with 1,4-diazine

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...

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Bibliographic Details
Published in:Chemical physics letters 2000-10, Vol.329 (1), p.7-14
Main Authors: Nihei, Taka-aki, Ishimaru, Shin'ichi, Ishida, Hiroyuki, Ishihara, Hideta, Ikeda, Ryuichi
Format: Article
Language:English
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Summary: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.
ISSN:0009-2614
1873-4448
DOI:10.1016/S0009-2614(00)00985-4