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首页> 外文期刊>Applied Magnetic Resonance >Structural and magnetic phase transitions in (chloroanilinium)(2)CuX4 (X = Cl, Br)
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Structural and magnetic phase transitions in (chloroanilinium)(2)CuX4 (X = Cl, Br)

机译：（氯苯胺）（2）CuX4（X = Cl，Br）中的结构和磁性相变

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Successive structural phase transitions of (4-ClC6H4NH3)(2)CuCl4, which occur in a very narrow temperature range were reinvestigated by Fourier transform nuclear quadrupole resonance (FT NQR) measurements. The phase transitions at 275.5 and 277.0 K were confirmed. The effect of the deuteration of the ammonium end on these transitions was studied. The Cl-35 NQR frequencies of organic cation were observed to decrease by about 4 kHz and the phase transition temperatures to decrease by about 2 K by the deuteration, suggesting that the -NH3+...Cl hydrogen bond is weakened by the deuteration. The magnetic phase transition temperature of 8.6 K showed no remarkable change within experimental error by the deuteration. It was found that the magnetically ordered state is broken by the radio-frequency magnetic field of about 15-35 Oe usually employed in pulsed NQR. However, in the deuterated compound (4-ClC6H4ND3)(2)CuCl4, the ordered state was found to be stable for the usual radio-frequency power. By combining with the NQR data of (4-ClC6H4NE3)(2)CuBr4 and (3,5-Cl2C6H3NH3)(2)CuCl4, the possibility is discussed of tuning the interlayer interaction between the organic cation layer and the inorganic complex anion layer by the halogen substitution in the organic cation as well as by the halogen replacement in the inorganic complex anion.
机译：（4-ClC6H4NH3）（2）CuCl4的连续结构相变发生在非常窄的温度范围内，通过傅里叶变换核四极共振（FT NQR）测量进行了重新研究。确认了在275.5和277.0 K处的相变。研究了铵端氘化对这些过渡的影响。通过氘，观察到有机阳离子的Cl-35 NQR频率降低了约4 kHz，相变温度降低了约2 K，这表明-NH3 + ... Cl氢键由于氘而减弱。氘的8.6 K的磁相变温度在实验误差范围内未显示任何显着变化。已经发现，通常在脉冲NQR中采用的约15-35Oe的射频磁场破坏了磁有序状态。然而，在氘代化合物（4-ClC6H4ND3）（2）CuCl4中，发现有序状态对于常规射频功率是稳定的。通过结合（4-ClC6H4NE3）（2）CuBr4和（3,5-Cl2C6H3NH3）（2）CuCl4的NQR数据，讨论了通过以下方法调节有机阳离子层与无机络合物阴离子层之间的层间相互作用的可能性。有机阳离子中的卤素取代以及无机络合物阴离子中的卤素取代。

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