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Jahn-Teller effect in circulenes: X-ray diffraction study of coronene and corannulene radical anions

机译:Circules中的Jahn-Teller效应:异戊二烯和环戊二烯自由基阴离子的X射线衍射研究

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摘要

Single-crystal X-ray diffraction studies of two polyaromatic radical anions crystallized as sodium salts, namely [Na(DME)_3]~+[C _(20)H_(10) ~-] (1) and [Na(DME)_3] ~+[C_(24)H_(12) ~-] (2) are reported. This allowed the first structural evaluation of Jahn-Teller (JT) effects for monoreduced circulenes and a comparison between bowl-shaped corannulene and planar coronene. The C_s and D_(2h) symmetrical distortions are found to fit the experimental data for C_(20)H_(10).~- and C_(24)H_(12).~-, respectively. The continuous symmetry measure (CSM) analysis was carried out to provide a quantitative measure of the JT distortions in 1 and 2. In addition, the X-ray crystallographic results were fully supported by DFT calculations. Jahn-Teller distortions in nonplanar corannulene and planar coronene were detected in the solid state using single-crystal X-ray diffraction data. C_s and D_(2h) symmetrical distortions fit the experimental data for C _(20)H_(10).- and C_(24)H_(12).~-, respectively. The experimental data were supported by density functional theory calculations and continuous symmetry measure analysis.
机译:[Na(DME)_3]〜+ [C _(20)H_(10)〜-](1)和[Na(DME)]结晶为钠盐的两个多芳族自由基阴离子的单晶X射线衍射研究报告了_3]〜+ [C_(24)H_(12)〜-](2)。这允许对单还原环的Jahn-Teller(JT)效应进行首次结构评估,并且可以比较碗形氢化萘和平面二苯并戊烯。发现C_s和D_(2h)对称畸变分别适合C_(20)H_(10)。〜-和C_(24)H_(12)。〜-的实验数据。进行了连续对称测量(CSM)分析,以定量测量1和2中的JT畸变。此外,DFT计算完全支持X射线晶体学结果。使用单晶X射线衍射数据,在固态下检测到非平面型花环戊烯和平面型花环烯中的Jahn-Teller变形。 C_s和D_(2h)对称畸变分别拟合C_(20)H_(10).-和C_(24)H_(12).-的实验数据。实验数据得到密度泛函理论计算和连续对称度量分析的支持。

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