N,N′-1,3-Propano-bridged indigo was reduced by one electron to the semi-reduced radical when irradiated by visible light (λ > 500 nm) in a deaerated benzene solution containing triethylamine whereas N,N′-dimethylindigo and N,N′-diacetylindigo were reduced by two electrons to their leuco forms under the same reaction conditions.
<i>N</i>,<i>N</i>′-Disubstituted Indigos as Readily Available Red-Light Photoswitches with Tunable Thermal Half-Lives
作者:Chung-Yang Huang、Aurelio Bonasera、Lachezar Hristov、Yves Garmshausen、Bernd M. Schmidt、Denis Jacquemin、Stefan Hecht
DOI:10.1021/jacs.7b08726
日期:2017.10.25
Some rare indigoderivatives have been known for a long time to be photochromic upon irradiation with red light, which should be advantageous for many applications. However, the absence of strategies to tune their thermal half-lives by modular molecular design as well as the lack of proper synthetic methods to prepare a variety of such molecules from the parent indigo dye have so far precluded their
G-Quadruplex-binding compounds are currently perceived as possible anticancer therapeutics. Here, starting from a promising lead, a small series of novel hydrazone-based compounds were synthesized and evaluated as G-quadruplex binders. The in vitro G-quadruplex-binding properties of the synthesized compounds were investigated employing both human telomeric and oncogene promoter G-quadruplexes with
The Cascade Reactions of Indigo with Propargyl Substrates for Heterocyclic and Photophysical Diversity
作者:Patrick M. McCosker、Nicholas M. Butler、Alireza Shakoori、Michel K. Volland、Matthew J. Perry、Jesse W. Mullen、Anthony C. Willis、Timothy Clark、John B. Bremner、Dirk M. Guldi、Paul A. Keller
DOI:10.1002/chem.202003662
日期:2021.2.19
propargyl moiety can behave as an electrophile when aromatic terminal substitutions are made, and therefore competes with leaving group substitution for new outcomes. Selected products from the cascade reactions were investigated for their absorption and fluorescence properties, including transient absorption spectroscopy. This revealed polarity dependent excited state relaxation pathways, fluorescence, and
carried out to investigate the ultrafastexcitedstatedynamics of both trans → cis and trans ← cis photoisomerization of red-light-absorbing indigo derivatives. For N,N′-bis(tert-butyloxycarbonylmethyl)indigo (tBOMI), the excitedstate lifetime of the trans-form was measured to be 41 ps while that of the cis-form was as short as 730 fs in acetonitrile (Acn). The excitedstate lifetime of trans-N,N′-dimethylindigo
进行了飞秒时间分辨瞬态吸收 (TRTA) 光谱研究,以研究反式→顺式和反式←顺式光异构化吸收红光的靛蓝衍生物的超快激发态动力学。对于N , N '-双(叔丁氧羰基甲基)靛蓝 ( t BOMI),在乙腈 (Acn) 中,反式的激发态寿命测量为 41 ps,而顺式的激发态寿命短至 730 fs。 )。trans - N , N的激发态寿命Acn 中的 '-二甲基靛蓝 (DMI) 也被测量为短至 10 ps。这些值比靛蓝衍生物的蓝光吸收反式如N , N的值要短得多'-二乙酰靛 (DAI) 和硫靛 (ThI)。靛蓝的生色团由两对电子供体和受体取代基组成,它们以字母“H”的形状共轭(所谓的“H-生色团”),尽管 DFT 和 TDDFT 计算表明电荷转移 (CT) 特性不是很重要。然而,当 H 发色团内的弱 CT 被促进时,吸收带向更长的波长移动,激发态寿命缩短。对于 DAI 和 ThI 的光异构化,