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首页> 外文期刊>Journal of structural chemistry >A quantum chemical study of the structure and energy of β-diketonates. XVII. Internal rotation of radical substituents in β-diketonate molecules
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A quantum chemical study of the structure and energy of β-diketonates. XVII. Internal rotation of radical substituents in β-diketonate molecules

机译:β-二酮酸酯的结构和能量的量子化学研究。十七。 β-二酮酸酯分子中自由基取代基的内部旋转

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A quantum chemical study of the internal rotation of CX_3 (X = H, F, CH_3) radical substituents in scandium and calcium β-diketonate complexes is performed. Calculations are carried out using the GAUSSIAN-03 program at the HF and DFT/B3LYP levels with relativistic effective core pseudo-potentials and valence double zeta basis sets. Analytical expressions V (φ) are obtained that describe the potential energy variation during the rotation of CX_3 groups. The rotation of CH_3 and CF_3 groups is shown to be described by a simple potential of the form V = V_0 /2 + V_3cos(3φ), while for the description of the rotation of tert -butyl groups it is required to use a more complex function V = V_0 /2 + V_3cos(3φ) + V_6 cos(6φ). Based on the obtained expressions for V (φ), the effective torsion angles φ_(ef) of the rotation of CX 3 groups are calculated for different temperatures. It is shown that φ ef obtained based on the quantum chemical calculations are close to the values obtained in electron diffraction experiments.
机译:对scan和β-二酮酸钙络合物中CX_3(X = H,F,CH_3)自由基取代基的内部旋转进行了量子化学研究。使用GAUSSIAN-03程序在HF和DFT / B3LYP水平上使用相对论有效核心伪势和价双zeta基集进行计算。获得了描述CX_3组旋转期间势能变化的解析表达式V(φ)。显示CH_3和CF_3基团的旋转由以下形式表示:V = V_0 / 2 + V_3cos(3φ),而对于叔丁基基团的描述则需要使用更复杂的形式函数V = V_0 / 2 + V_3cos(3φ)+ V_6 cos(6φ)。基于获得的V(φ)表达式,计算出不同温度下CX 3组旋转的有效扭转角φ_(ef)。结果表明,基于量子化学计算获得的φef与电子衍射实验中获得的值接近。

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