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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >A Localized Molecular Orbital Study of the Halogen Substitution Effect on Rh-103 NMR Shielding in [Cp*RhX2](2), Where X = Cl, Br, or I
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A Localized Molecular Orbital Study of the Halogen Substitution Effect on Rh-103 NMR Shielding in [Cp*RhX2](2), Where X = Cl, Br, or I

机译:[Cp * RhX2](2)中X = Cl,Br或I的卤素取代对Rh-103 NMR屏蔽的影响的局部分子轨道研究

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摘要

Rh-103 NMR parameters and the bonding structure of three complexes of [Cp*RhX2](2), where X = Cl, Br, or I, have been studied with the help of natural bond orbitals (NBOs) and natural localized molecular orbitals (NLMOs). The complexes of [Cp*RhX2](2), where X = Cl, Br, or I, have similar bonding structures, with the major difference being in the degree of covalency of the Rh-X bonds. The decomposition of Rh-103 NMR shielding into diamagnetic, paramagnetic, and spin orbit terms shows that normal halogen dependence (NHD) of the Rh-103 NMR shift is defined mostly by the paramagnetic term, with the spin-orbit term being significantly smaller. The decomposition of Rh-103 shielding into spin-free NBO and NLMO contributions shows that Rh-103 shielding is dominated by Rh d-orbital deshielding contributions. We explain the NHD of the 103(Rh) NMR shift with the increase in the energies of the virtual antibonding Rh-X orbitals along the X = Cl, Br, and I series.
机译:利用自然键轨道(NBO)和自然局部分子轨道研究了[Cp * RhX2](2)的三个配合物的Rh-103 NMR参数和键结构,其中X = Cl,Br或I (NLMO)。 X = Cl,Br或I的[Cp * RhX2](2)的配合物具有相似的键合结构,主要区别在于Rh-X键的共价程度。 Rh-103 NMR屏蔽分解为反磁性,顺磁性和自旋轨道项表明,Rh-103 NMR位移的正常卤素依赖性(NHD)主要由顺磁性项定义,自旋轨道项明显较小。 Rh-103屏蔽分解为无自旋的NBO和NLMO贡献表明,Rh-103屏蔽以Rh d轨道去屏蔽贡献为主。我们解释了沿着X = Cl,Br和I系列的虚拟反键Rh-X轨道能量的增加,103(Rh)NMR位移的NHD。

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