Temperature dependence study of chlorine NQR frequency and spin-lattice relaxation time in 2-amino,-3,5-dichloropyridine

Amjadi, Mohammed Hossein Ala; Ramesh, K.; Kumar, Nitin; Ramakrishna, J.

doi:10.1002/(sici)1097-458x(199910)37:10<693::aid-mrc509>3.0.co;2-f

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“…Weber16 has carried out Zeeman NQR study on p‐dichlorobenze and reported that the values obtained for W 2 / W 1 are higher at 77 K compared to room temperature. The values obtained for W 2 / W 1 in this study agree well with the previously reported result of Ala Amjadi et al 17 It is seen that the choice of 56 cm −1 leads to W 2 / W 1 values of 5.268 (line I) and 22.95 (line II) at 289 K and 88.15 (line I) and 298.1 (line II) at 77 K. The corresponding values for other modes are much larger. Hence, the torsional frequency 56 cm −1 was chosen for T 1 analysis.…”

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confidence: 92%

Temperature‐ and pressure‐dependent study of ³⁵Cl NQR frequency and spin lattice relaxation time in 2,3‐dichloroanisole

Ramu

Ramesh

Ramananda

et al. 2010

Magnetic Reson in Chemistry

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The temperature and pressure dependence of (35)Cl NQR frequency and spin lattice relaxation time (T(1)) were investigated in 2,3-dichloroanisole. Two NQR signals were observed throughout the temperature and pressure range studied. T(1) were measured in the temperature range from 77 to 300 K and from atmospheric pressure to 5 kbar. Relaxation was found to be due to the torsional motion of the molecule and also reorientation of motion of the CH(3) group. T(1) versus temperature data were analyzed on the basis of Woessner and Gutowsky model, and the activation energy for the reorientation of the CH(3) group was estimated. The temperature dependence of the average torsional lifetimes of the molecules and the transition probabilities were also obtained. NQR frequency shows a nonlinear behavior with pressure, indicating both dynamic and static effects of pressure. The pressure coefficients were observed to be positive for both the lines. A thermodynamic analysis of the data was carried out to determine the constant volume temperature coefficients of the NQR frequency. The variation of spin lattice time with pressure was very small, showing that the relaxation is mainly due to the torsional motions of the molecules.

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Section: Resultssupporting

confidence: 92%

Temperature‐ and pressure‐dependent study of ³⁵Cl NQR frequency and spin lattice relaxation time in 2,3‐dichloroanisole

Ramu

Ramesh

Ramananda

et al. 2010

Magnetic Reson in Chemistry

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View full text Add to dashboard Cite

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Temperature dependence study of chlorine NQR frequency and spin-lattice relaxation time in 2-amino,-3,5-dichloropyridine

Cited by 1 publication

References 24 publications

Temperature‐ and pressure‐dependent study of ³⁵Cl NQR frequency and spin lattice relaxation time in 2,3‐dichloroanisole

Temperature‐ and pressure‐dependent study of ³⁵Cl NQR frequency and spin lattice relaxation time in 2,3‐dichloroanisole

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Temperature dependence study of chlorine NQR frequency and spin-lattice relaxation time in 2-amino,-3,5-dichloropyridine

Cited by 1 publication

References 24 publications

Temperature‐ and pressure‐dependent study of 35Cl NQR frequency and spin lattice relaxation time in 2,3‐dichloroanisole

Temperature‐ and pressure‐dependent study of 35Cl NQR frequency and spin lattice relaxation time in 2,3‐dichloroanisole

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Temperature‐ and pressure‐dependent study of ³⁵Cl NQR frequency and spin lattice relaxation time in 2,3‐dichloroanisole

Temperature‐ and pressure‐dependent study of ³⁵Cl NQR frequency and spin lattice relaxation time in 2,3‐dichloroanisole