Electrical Conductivity, Differential Scanning Calorimetry, X-ray Diffraction, and 7Li Nuclear Magnetic Resonance Studies of n-CxH(2x+1)OSO3Li (x = 12, 14, 16, 18, and 20)
Electrical Conductivity, Differential Scanning Calorimetry, X-ray Diffraction, and 7Li Nuclear Magnetic Resonance Studies of n-CxH(2x+1)OSO3Li (x = 12, 14, 16, 18, and 20)
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n-CxH(2x 1)OSO3Li (x = 12、14、16、18 和 20) 的电导率、差示扫描量热法、X 射线衍射和 7Li 核磁共振研究
DOI：
10.1007/s10751-014-1087-7
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发表时间：
2015
影响因子：
--
通讯作者：
and Hisashi Honda
中科院分区：
文献类型：
--
作者：
Satoru Hirakawa;Yoshiaki Morimoto;and Hisashi Honda
n-CxH(2x+1)OSO3Li (x= 12、14、16、18 和 20) 晶体的电导率 (σ)、差示扫描量热法 (DSC) 和 X 射线衍射 (XRD) 测量作为温度的函数。此外,还对n-CxH(2x+1)OSO3Na和n-CxH(2x+1)OSO3K(x=12、14、16、18、20)晶体进行了σ、DSC和XRD观察进行比较。盐的 DSC 结果揭示了几种具有大熵变 (ΔS) 的固-固相变。对于n-C18H37OSO3Li和n-C20H41OSO3Li盐，与固相中的总熵变(ΔStr1+ΔStr2)相比，每个熔点产生较小的ΔSmp值。此外，在最高温度固相中检测到Li+离子扩散。对于K盐，与报道的烷基羧酸盐相比，烷基硫酸钾检测到更大的σ值。低温相记录的n-C18H37OSO3Li晶体的7Li NMR谱显示出较大的不对称参数，表明Li + 离子位于晶体中的不对称位点。
Electrical conductivity (σ), differential scanning calorimetry (DSC), and X-ray diffraction (XRD) measurements ofn-CxH(2x+1)OSO3Li (x= 12, 14, 16, 18, and 20) crystals were performed as a function of temperature. In addition,σ, DSC, and XRD observations ofn-CxH(2x+1)OSO3Na andn-CxH(2x+1)OSO3K (x= 12, 14, 16, 18, and 20) crystals were carried out for comparison. DSC results of the salts revealed several solid-solid phase transitions with large entropy changes (ΔS). Forn-C18H37OSO3Li andn-C20H41OSO3Li salts, each melting point produced a small ΔSmpvalue compared with the total entropy change in the solid phases (ΔStr1+ΔStr2). Additionally, Li+ion diffusion was detected in the highest temperature solid phases. For K salts, largerσvalues were detected for potassium alkylsulfates compared with those reported for alkyl carboxylate.7Li NMR spectra ofn-C18H37OSO3Li crystals recorded in the low-temperature phase showed large asymmetry parameters, suggesting the Li+ions are localized at asymmetric sites in the crystals.