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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Relativistic effect on ~(77)Se NMR chemical shifts of various selenium species in the framework of zeroth-order regular approximation
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Relativistic effect on ~(77)Se NMR chemical shifts of various selenium species in the framework of zeroth-order regular approximation

机译:零级正则近似框架下相对论对各种硒的〜(77)Se NMR化学位移的影响

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摘要

The relativistic effects on absolute magnetic shielding tensors (?(Se)) are explicitly evaluated for various selenium species (40 species) with the DFT(BLYP)-GIAO method. Calculations are performed under relativistic and nonrelativistic conditions with the Slater-type basis sets in ADF 2010 in the framework of ZORA, employing the optimized structures under nonrelativistic conditions at B3LYP of Gaussian 03. Quadruple zeta all electron with four polarization functions (QZ4Pae) are mainly applied to evaluate σ(Se). Ranges of the effect on diamagnetic (σ~d(Se)), paramagnetic shielding tensors (σ~p(Se)), and σ~(d+p)(Se) (= σ~d(Se) + σ~p(Se)) are -24 to -20 ppm, -115 to -3 ppm, and -136 to -26 ppm, respectively. The spin-orbit terms (σ~(so)(Se)) are evaluated to be 92-225 ppm with QZ4Pae, which clarifies the effect on total shielding tensors (σ~t(Se) = σ~(d+p)(Se) + σ~(so)(Se)) to be -8 to 152 ppm, at the spin-orbit ZORA level. The calculated σ~t(Se) values reproduced well the observed values.
机译:使用DFT(BLYP)-GIAO方法明确评估了各种硒物种(40种)对绝对磁屏蔽张量(?(Se))的相对论效应。在ZORA框架下,在相对论和非相对论条件下使用ADF 2010中的Slater型基集进行计算,并在非相对论条件下在高斯03的B3LYP上使用了优化的结构。四倍Zeta所有具有四个极化函数的电子都主要是QZ4Pae用于评估σ(Se)。对抗磁(σ〜d(Se)),顺磁屏蔽张量(σ〜p(Se))和σ〜(d + p)(Se)的影响范围(=σ〜d(Se)+σ〜p (Se))分别为-24至-20 ppm,-115至-3 ppm和-136至-26 ppm。用QZ4Pae将自旋轨道项(σ〜(so)(Se))评估为92-225 ppm,这澄清了对总屏蔽张量(σ〜t(Se)=σ〜(d + p)( Se)+σ〜(so)(Se))在自旋轨道ZORA级别为-8至152 ppm。计算得到的σ〜t(Se)值很好地再现了观测值。

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