A quadruple helicene with a rubicene core: synthesis, structural analyses and properties

A quadruple helicene with a rubicene core: synthesis, structural analyses and properties
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具有红二烯核心的四螺旋烯:合成、结构分析和性质

DOI:
10.1007/s11426-020-9913-5
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发表时间:
2021-01
期刊:
Science China Chemistry
影响因子:
--
通讯作者:
Hua Jiang
Hua Jiang
中科院分区:
其他
文献类型:
--
作者:
Qi Xu;Chu Wang;Dan Zheng;Ying Wang;Xuebo Chen;Di Sun;Hua Jiang

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本文报道了利用Scholl反应合成一个以Rubicene为核R1的四重螺旋烯。在10个立体异构体中,包括4对映体和2个内消旋异构体,仅分离出2对映体和1个内消旋异构体。样品结构通过X射线晶体学明确地确定为具有螺旋桨状结构的(P,P)6-(P,P)5/(M,M)6-(M,M)5-R1-A和具有鞍形结构的(M,M)6-(P,P)5/(P,P)6-(M,M)5-R1-Band(M,P)6-(P,M)5-R1-C。通过手性HPLC对R1进行拆分,得到两对手性立体异构体(P,P)6-(P,P)5/(P,P)6-(M,M)5,(M,M)6-(P,P)5/(M,M)6-(M,M)5和一个内消旋异构体(M,P)6-(P,M)5,并通过CD光谱和含时密度泛函理论(TD-DFT)计算对其进行了表征.令人惊讶的是,这些解决的立体异构体和unresolvedR 1的紫外-可见吸收和发射光谱几乎是相同的。此外,在室温下,R1的化学氧化导致自由基阳离子和双阳离子的形成。
We report the synthesis of a quadruple helicene with a rubicene coreR1by a Scholl reaction. Among the 10 stereoisomers including 4 pairs of enantiomers and 2 meso isomers, only 2 pairs of enantiomers and 1 meso isomer have been isolated. The sample structures were unambiguously determined by X-ray crystallography to be (P,P)6-(P,P)5/(M,M)6-(M,M)5-R1-A, which has a propeller-shaped structure, and (M,M)6-(P,P)5/(P,P)6-(M,M)5-R1-Band (M,P)6-(P,M)5-R1-C, which have saddle-shaped structures. The chiral resolutions ofR1were carried out by chiral HPLC, revealing two pairs of chiral stereoisomers (P,P)6-(P,P)5/(P,P)6-(M,M)5, (M,M)6-(P,P)5/(M,M)6-(M,M)5as well as a meso isomer (M,P)6-(P,M)5, which were further characterized by CD spectroscopy and time-dependent density functional theory (TD-DFT) calculations. Surprisingly, the UV-vis absorption and emission spectra of these resolved stereoisomers and unresolvedR1were almost identical. In addition, the chemical oxidation ofR1led to the formation of radical cations and dications at room temperature.
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