NDLI: Isotope ratio of Cl NQR spin-lattice relaxation times in 1D hydrogen-bonding system of tetramethylpyrazine-chloranilic acid at high temperatures

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Isotope ratio of Cl NQR spin-lattice relaxation times in 1D hydrogen-bonding system of tetramethylpyrazine-chloranilic acid at high temperatures

Content Provider	Semantic Scholar
Author	Asaji, Tetsuo
Copyright Year	2013
Abstract	The temperature dependences of spin-lattice relaxation time T1 of 35Cl and 37Cl NQR were studied for the co-crystal of tetramethylpyrazine (TMP) with chloranilic acid (H2ca), TMP-H2ca, in which one-dimensional hydrogen bonding is formed by alternate arrangement of TMP and H2ca. The isotope ratio 37Cl T1 / 35Cl T1 was determined to be 1.0 ± 0.1 above ca. 290 K where a steep decrease of spin-lattice relaxation time T1 with increasing temperature was observed. In this temperature range it is suggested that the relaxation is originated from the slow fluctuation of electric field gradient (EFG). Beside EFG fluctuation due to the external-charge-density fluctuation, the small angle reorientation of the quantization axis triggered by a proton transfer motion between N.H-O and N-H.O hydrogen bonding states is proposed.
Starting Page	15
Ending Page	18
Page Count	4
File Format	PDF HTM / HTML
DOI	10.1007/s10751-012-0673-9
Volume Number	222
Alternate Webpage(s)	https://page-one.springer.com/pdf/preview/10.1007/s10751-012-0673-9
Alternate Webpage(s)	https://espace.cern.ch/ISOLDE-SSP/HFI/HFI2012/Asaji%20Preprint%20Hyperfine%20Interactions%20222%20(2013)%2015-18.pdf
Alternate Webpage(s)	https://doi.org/10.1007/s10751-012-0673-9
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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