New two- and three-cationic polymethine dyes. Synthesis, properties and application
作者:Janina Kabatc、Katarzyna Jurek
DOI:10.1016/j.dyepig.2014.06.016
日期:2015.1
applied as visiblelightinitiators for acrylic monomer polymerization. In the photoinitiating system, the polymethine dye cation acts as an electron acceptor whereas borate anion is an electron donor. The actual photoinitiators can only operate in a restricted part of the visiblelight region; as a consequence, a several photoinitiators are usually necessary to harvest all the emitted visible photons
Photoinduced Electron Transfer (PET)-Mediated Fragmentation of Picolinium-Derived Redox Probes
作者:Petra Dunkel、Anna Barosi、Hamid Dhimane、François Maurel、Peter I. Dalko
DOI:10.1002/chem.201801684
日期:2018.9.3
le dyads was analyzed experimentally and by using density functional theory (DFT) and time dependent‐DFT (TD‐DFT) calculations. In contrast to earlier observations efficient one and two‐photon fragmentations conditions were found for 15 c (δu=0.16 GM at 730 nm) opening the way for the design of a novel class of “caged” compounds.
通过使用密度泛函理论(DFT)和时间依赖DFT(TD-DFT)计算,通过实验分析了共价连接的苯基乙酸N-烷基吡啶甲酸哌唑二唑的光解作用。与早期的观察结果发现高效的和双光子碎裂条件15℃(δ û = 0.16 GM在730纳米)为一类新的“笼”的化合物的设计开辟了道路。
Photolytic Release of Carboxylic Acids Using Linked Donor−Acceptor Molecules: Direct versus Mediated Photoinduced Electron Transfer to <i>N</i>-Alkyl-4-picolinium Esters
作者:Chitra Sundararajan、Daniel E. Falvey
DOI:10.1021/ol050744n
日期:2005.6.1
[reaction: see text] Efficient photorelease (Phi = 0.7) of carboxylic acids is achieved with a covalently linked mediator (benzophenone) protecting group (N-alkyl-4-picolinium ester) molecule. The mechanism involves initial photoreduction of the mediator, followed by rapid electrontransfer to the protecting group.
Photorelease of Carboxylic Acids, Amino Acids, and Phosphates from <i>N</i>-Alkylpicolinium Esters Using Photosensitization by High Wavelength Laser Dyes
作者:Chitra Sundararajan、Daniel E. Falvey
DOI:10.1021/ja050760f
日期:2005.6.1
Visible light (>450 nm) is used to efficiently cleave carboxylic acids, aminoacids, and phosphates from their N-methyl picolinium esters. Photolysis using pyrromethene dyes PM 546 and PM 597 and also coumarin 6 as photosensitizers effects release of carboxylic acids, N-protected aminoacids, and phosphates in quantitative yields. The effective rate of photorelease by the dyes, Phiepsilon, was found
Photoreleasable Protecting Groups Triggered by Sequential Two-Photon Absorption of Visible Light: Release of Carboxylic Acids from a Linked Anthraquinone-<i>N</i>-Alkylpicolinium Ester Molecule
作者:Matthew D. Thum、Daniel E. Falvey
DOI:10.1021/acs.jpca.8b00657
日期:2018.3.29
protecting group activated by sequential absorption of two visible photons is designed, synthesized, and tested. Specifically, an anthraquinone-based chromophore is covalently attached to an N-alkylpicolinium ester. Photolysis of this linked system results in the clean release of a corresponding carboxylic acid. Through product analysis, laserflashphotolysis, and steady-state UV–vis spectroscopy, it