作者:Ying Chen、Chaojun Lin、Zhixing Luo、Zhibo Yin、Haonan Shi、Yanpeng Zhu、Jiaobing Wang
DOI:10.1002/anie.202014621
日期:2021.3.29
This work reports the first double π‐extended undecabenzo[7]helicene 1, which is a large chiral nanographene, composed of 65 fused rings and 186 conjugated carbon atoms. The molecular identity of 1 has been confirmed by single crystal X‐ray diffraction. A wine coloured solution of 1 in dichloromethane absorbs light from ultraviolet to the near infrared, featuring an extremely large molar absorption
这项工作报告了第一个双π扩展的十一碳并苯并[7] ic烯1,它是一个大的手性纳米石墨烯,由65个稠合环和186个共轭碳原子组成。的分子身份1已经通过单晶X-射线衍射证实。酒色的二氯甲烷溶液1吸收紫外线到近红外的光,在573 nm处的摩尔吸收系数非常大,为844 000 M -1 cm -1。光学纯1在可见光谱范围(| Δϵ | = 1375 M -1 cm -1对于任何离散的多环芳烃而言,在430 nm处已知)。这些不寻常的光物理特性1与单十一碳二苯并[7] ic烯衍生物2形成鲜明的对比。
Organometallic Dendrimers Based on (Tetraphenylcyclobutadiene)cyclopentadienylcobalt Modules
作者:Shane M. Waybright、Kanika McAlpine、Matthew Laskoski、Mark D. Smith、Uwe H. F. Bunz
DOI:10.1021/ja026462p
日期:2002.7.1
The synthesis and characterization of novel organometallic polyphenylene dendrimers containing 24 or 44 phenyl rings and one cyclobutadiene(cyclopentadienyl)cobalt unit is reported. The dendrimers are made by the convergent CPCO(CO)(2)-mediated dimerization of di- or tetraethynyltolanes followed by a divergent core extension utilizing tetraphenylcyclopentadienone. The obtained dendrimers are air and water stable, soluble materials that show interesting differences in their hydrodynamic properties as evidenced by gel permeation chromatography. Scanning pulse voltammetry in solution shows that the dendrimers are oxidized at potentials ranging from 0.8 to 0.83 V. The more sterically encumbered the dendrimer, the higher its oxidation potential, that is, the more difficult oxidation is.
A Novel Approach for the Oxidative Degradation of Organic Pollutants in Aqueous Solutions Mediated by Iron Tetrasulfophthalocyanine under Visible Light Radiation
An efficient approach has been developed to decompose toxic organic pollutants. The photodegradation of Rhodamine B (RhB), salicylic acid, and Orange It was examined in the presence of iron tetrasulfophthalocyanine ([Fe(PcS)]) and H,07 under visible irradiation. It was found that under visible light irradiation, organic pollutants in the [Fe(PcS)]/H2O2 system can be rapidly degraded, but the concentration of [Fe(PcS)] remains nearly unchanged, and this indicates that [Fe(PcS)] has a good catalytic character. EPR results and other experimental results suggest that the light-activated reaction process involves the formation and reaction of HO. radicals. On the basis of the experimental results. a possible reaction mechanism for the degradation of organic pollutants under visible light illumination in the aqueous [Fe(PcS)]/H2O2 solutions is proposed.