TY - JOUR
T1 - Hydrogen transfer in hydrogen-bonded chloranilic acid studied by 35Cl NQR I - A 1:2 complex with 1,4-diazine
AU - Nihei, Taka Aki
AU - Ishimaru, Shin'Ichi
AU - Ishida, Hiroyuki
AU - Ishihara, Hideta
AU - Ikeda, Ryuichi
PY - 2000/10/13
Y1 - 2000/10/13
N2 - 35Cl NQR frequencies and spin-lattice relaxation time (T1Q) and 1H NMR relaxation times (T1H) 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 pKa values in both acid and base. T1H temperature dependence was explained by a single relaxation mechanism due to the correlated H-transfer in two H-bonds, while that of T1Q yielded two relaxation processes. One of these undetected by 1H NMR was explained by the uncorrelated H-transfer.
AB - 35Cl NQR frequencies and spin-lattice relaxation time (T1Q) and 1H NMR relaxation times (T1H) 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 pKa values in both acid and base. T1H temperature dependence was explained by a single relaxation mechanism due to the correlated H-transfer in two H-bonds, while that of T1Q yielded two relaxation processes. One of these undetected by 1H NMR was explained by the uncorrelated H-transfer.
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U2 - 10.1016/S0009-2614(00)00985-4
DO - 10.1016/S0009-2614(00)00985-4
M3 - Article
AN - SCOPUS:0043228555
SN - 0009-2614
VL - 329
SP - 7
EP - 14
JO - Chemical Physics Letters
JF - Chemical Physics Letters
IS - 1-2
ER -