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Synthesis, spectroscopic and electrochemical characterization, and DFT study of Seventeen C-70(CF3)(n) derivatives (n=2, 4, 6, 8, 10, 12)

机译:十七种C-70(CF3)(n)衍生物(n = 2、4、6、8、10、12)的合成,光谱和电化学表征以及DFT研究

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摘要

Eight new C-70(CF3)(n) derivatives (n=2, 6, 10, 12) have been synthesized and characterized by UV/Vis and (FNMR)-F-19 spectroscopy, cyclic voltammetry, and quantum chemical calculations at the DFT level of theory. Nine previously known derivatives of C-70(CF3)(n) with n=2-12 were also studied by cyclic voltammetry (and seven of them by UV/Vis spectroscopy for the first time). Most of the 17 compounds exhibited two or three reversible reductions at scan rates from 20 mV s(-1) up to 5.0 V s(-1). In general, reduction potentials for the 0/- couple are shifted anodically relative to the C-70(0/-) couple. However, the 0/- E-1/2 values for a given composition are strongly dependent on the addition pattern of the CF3 groups. The data show that the addition pattern is as important, if not more important in some cases, than the number of substituents, n, in determining E-1/2 values. An analysis of the DFT-predicted LUMOs indicates that addition patterns that have non-terminal double bonds in pentagons result in derivatives that are strong electron acceptors.
机译:合成了八种新的C-70(CF3)(n)衍生物(n = 2、6、10、12),并通过UV / Vis和(FNMR)-F-19光谱,循环伏安法以及在90℃下的量子化学计算进行了表征。 DFT理论水平。还通过循环伏安法研究了九种先前已知的n = 2-12的C-70(CF3)(n)衍生物(其中七种是首次通过UV / Vis光谱法)。在从20 mV s(-1)到5.0 V s(-1)的扫描速率下,这17种化合物中的大多数显示出两到三个可逆的降低。通常,0 /-偶极的还原电位相对于C-70(0 /-)偶极阳极移位。但是,给定成分的0 /-E-1 / 2值在很大程度上取决于CF3基团的加成模式。数据表明,在某些情况下,加成模式与确定E-1 / 2值时的取代基数n同样重要,即使在某些情况下不那么重要。对DFT预测的LUMO的分析表明,在五边形中具有非末端双键的加成模式会生成强电子受体的衍生物。

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