化学
吩噻嗪
轨道能级差
发色团
薗头偶联反应
接受者
咔唑
光化学
三苯胺
四氰乙烯
吸收光谱法
有机化学
分子
催化作用
钯
物理
药理学
医学
量子力学
凝聚态物理
作者
Madhurima Poddar,Yogajivan Rout,Rajneesh Misra
标识
DOI:10.1002/ajoc.202100628
摘要
Abstract A set of donor‐acceptor (D‐A) substituted phenothiazine based chromophores (D‐π‐D‐π‐A, D′‐π‐D‐π‐A, D‐A′‐D‐π‐A and D′‐A′‐D‐π‐A) were designed and synthesized. The phenothiazine was substituted with the 4‐ethynyl‐1,8‐naphthalimide (NPI) on one side and a variety of donors (phenothiazine, carbazole, ferrocene and triphenylamine) were introduced on the other side of phenothiazine via Pd‐catalyzed Sonogashira cross‐coupling reaction resulting PTZ8 – 11 . In order to tune the optoelectronic properties of the phenothiazine chromophores, cyano‐based acceptor 1,1,4,4‐tetracyanobuta‐1,3‐diene (TCBD) was incorporated by [2+2] cycloaddition‐electrocyclic ring‐opening reaction of phenothiazine derivatives PTZs 8 – 11 and tetracyanoethylene (TCNE). The photophysical and electrochemical studies showed that the incorporation of TCBD acceptor in the phenothiazine chromophores PTZ s 12 – 15 facilitated the donor‐acceptor strength to greater extent. The electronic absorption spectra exhibited red shifted absorption bands for the TCBD substituted phenothiazines as compared to the alkynylated phenothiazines which led to much lower optical band gaps in the formers. The experimental values were also supported by the DFT and TD‐DFT calculations.
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