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NMR study of lanthanide (III) nitrate complexes in CMPOITBP systems

机译:CMPOITBP系统中硝酸镧系元素(III)配合物的NMR研究

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摘要

The coordination properties of the lanthanide (Ln)(Ln; La~Eu) nitrate complexes in octyl (phenyl)-N,N-diisobutylcar-bamoylmethylphosphine oxide(CMPO)/tributylphosphate (TBP) systems were investigatedusing NMR techniques. In LnICMPO/TBP Systems where themole ratio of CMPO to the Ln ion ((CMPO)/(Ln)) is under 3,~(13)C- and ~(31)P-NMR spectra show that several kinds ofcomplexes are produced in which both CMPO and TBPcoordinate to the Ln (III) ion. The contribution of CMPO to thecoordination with the Ln (III) ion increases with (CMPO)/(Ln),and in the case where (CMPO)/(Ln)>3, only CMPO coordinatesto the Ln (III) ion directly in the bidentate manner. The distancesfrom the Ln (III) ion to phosphoryl P or carbonyl C areestimated to be 3.3~4.3 A. In this system, TBP is absent fromthe first coordination sphere of the Ln (III) ion, but decreases theexchange rate constants, activation enthalpy and activationentropy in the CMPO exchange reaction between the free andcoordinated states by the action from beyond the first coordination sphere.
机译:利用NMR技术研究了镧系(Ln)(Ln),La〜Eu硝酸盐配合物在辛基(苯基)-N,N-二异丁基-氨基甲酰基甲基氧化膦(CMPO)/磷酸三丁酯(TBP)体系中的配位性能。在CMPO与Ln离子的对映体比率((CMPO)/(Ln))低于3的LnICMPO / TBP系统中,〜(13)C-和〜(31)P-NMR谱表明会生成多种配合物CMPO和TBP均与Ln(III)离子配位。 CMPO对与Ln(III)离子配位的贡献随着(CMPO)/(Ln)的增加而增加,并且在(CMPO)/(Ln)> 3的情况下,仅CMPO直接对Ln(III)离子配位。柔顺的态度。从Ln(III)离子到磷酰基P或羰基C的距离估计为3.3〜4.3 A.在该系统中,Ln(III)离子的第一个配位球不存在TBP,但降低了交换速率常数,活化焓和在第一个配位域之外的作用下,自由态和配位态之间的CMPO交换反应中的活化熵。

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