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首页> 外文期刊>Journal of Solution Chemistry >A Direct Carbon-13 and Nitrogen-15 NMR Study of Cerium(III)-Isothiocyanate Complexation in Aqueous Solvent Mixtures
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A Direct Carbon-13 and Nitrogen-15 NMR Study of Cerium(III)-Isothiocyanate Complexation in Aqueous Solvent Mixtures

机译:水溶液中铈(III)-异硫氰酸酯络合的直接碳13和氮15 NMR研究

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摘要

A study of lanthanide complexation with isothiocyanate is underway using a multinuclear magnetic resonance technique. For isothocyanate solutions in water-acetone-Freon mixtures at low temperature, -85_-125 deg C, ligand exchange is slow enough to permit the observation of ~(13)C and ~(15)N NMR signals for coordinated and free anions. For the Ce~(3+)-NCS~- system, four coordinated anion signals, displaced from the free anion signal by about +450 to +550 ppm for ~(15)N and +50 to +80 PPM for ~(13)C, are observed. The ~(13)C and ~(15)N spectral data are complementary, showing a signal area concentration dependence and measured coordination numbers consistent with the formation of Ce(NCS)~(2+) through Ce(NCS)~(1-)_4. In water-methanol, the extent of complexing is decreased, presumably because of the higher dielectric constant of this medium. In addition, the results of a competitive study of NCS~- and Cl~- ion binding, carried out using ~(35)Cl NMR, is presented.
机译:正在进行使用多核磁共振技术对镧系元素与异硫氰酸酯络合的研究。对于低温下-85--125℃的水-丙酮-氟橡胶混合物中的异氰酸酯溶液,配体交换的速度足够慢,可以观察到配位和游离阴离子的〜(13)C和〜(15)N NMR信号。对于Ce〜(3 +)-NCS〜-系统,四个配位阴离子信号,对于〜(15)N,与游离阴离子信号之间的位移约为+450至+550 ppm,对于〜(13),与+50至+80 PPM之间C),观察到。 〜(13)C和〜(15)N光谱数据是互补的,显示信号区域浓度依赖性和测得的配位数与通过Ce(NCS)〜(1-形成Ce(NCS)〜(2+)一致)_4。在水-甲醇中,络合程度降低了,大概是因为该介质的介电常数较高。此外,提出了使用〜(35)Cl NMR进行的NCS〜-和Cl〜-离子结合竞争研究的结果。

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