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- W2004219584 abstract "Abstract The temperature dependences of 35Cl NQR frequencies and of chlorine nuclear quadrupole relaxation times, T1Q have been determined for pyridinium tetrachloroaurate(III). The 35Cl NQR frequency of a single line appearing is 27.769 MHz at 293 K. With decreasing temperature, the NQR line is observed to become gradually broad and cannot be detected below ca. 230 K. 35Cl T1Q is observed to decrease with decreasing temperature from 800 μs at 350 K to 170 μs at 273 K. This fast relaxation rate may be responsible for the disappearance of the NQR signal described above. T1Q data are discussed by referring to the 1H NMR T1 data already determined. The dominant relaxation mechanism for T1Q below ca. 350 K can be attributed to the fluctuation of the field gradient due to the motion of the pyridinium ions in the crystal. Above ca. 360 K, T1Q decreases rapidly with increasing temperature suggesting the onset of a motion of [AuCl4]− ions. The activation energy for the motion is estimated to be 67 kJ mol−1. When the Larmor frequency of 1H T1 measurements is near to the NQR frequencies, anomalous temperature dependences of 1H T1 are observed, suggesting the occurrence of dipolar—quadrupolar cross relaxation with chlorine nuclei." @default.
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- W2004219584 date "1989-01-01" @default.
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- W2004219584 title "Chlorine nuclear quadrupole resonances and motion of pyridinium ions in pyridinium tetrachloroaurate(III)" @default.
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- W2004219584 doi "https://doi.org/10.1016/0022-2860(89)85042-2" @default.
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