Direct Photocatalytic S–H Bond Cyanation with Green “CN” Source

Guo, Wei; Tan, Wen; Zhao, Mingming; Zheng, Lvyin; Tao, Kailiang; Chen, Deliang; Fan, Xiaolin

doi:10.1021/acs.joc.8b00887

Cited by 78 publications

(45 citation statements)

References 74 publications

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“…In recent years, significant contributions aiming to alter the excited state behaviors and/or properties of polyaromatic chromophores have been disseminated in the chemical literature. [5][6][7][8][9][10][11] Yet, there is more room at the bottom to explore other variables and factors that can be employed to tune the photophysics of these chromophores. A known strategy that allows to tune the photo-kinetics of polyaromatics relies on perturbing the intrinsic ground state aromaticity by inserting pro/non-aromatic units such as para-quinodimethyl ring (p-QDM) in the backbone of organic polyaromatics with the expectation to generate metastable triplet excited species via aromaticity reversal.…”

Section: Introductionmentioning

confidence: 99%

Quinoidization of π‐Expanded Aromatic Diimides: Photophysics, Aromaticity, and Stability of the Novel Quinoidal Acenes

Kamatham

Shokri

et al. 2020

Eur J Org Chem

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We report the synthesis and photophysical characterization of π‐expanded quinoidal triplet chromophores which exhibit attractive light‐harvesting properties. The kinetic of the triplet excited state of quinoidal benzotetraphene 2 was found to be one order of magnitude higher than the lifetime of 3(1)* from the less conjugated parent chromophore 1. Furthermore, the evaluation of the optoelectronic properties indicates that π‐expansion helps narrow the optoelectronic band gap, but the influence of the additional aromatic rings in the structure of 2 and 3 compromises the stability of the p‐quinoidal ring. QDM 2 was isolated and fully characterized; however, it was found to rearomatize to a mixture of uncharacterized radical species.

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Section: Introductionmentioning

confidence: 99%

Quinoidization of π‐Expanded Aromatic Diimides: Photophysics, Aromaticity, and Stability of the Novel Quinoidal Acenes

Kamatham

Shokri

et al. 2020

Eur J Org Chem

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“…[1] Unlike fluorophores, which are mainly utilized owing to their luminescence properties, triplet photosensitizers are mainly used as triplet energy donors to initiate either photochemical reactions or induce photophysical processes. [2] Triplet photosensitizers have been considered for av ariety of applicationss uch as phosphorescent materials, [1,3,4] phosphorescent bioimaging, [5,6] chemosensors, [7,8] photoinitiated polymerization, [9] photocatalysis [10] and triplet-triplet annihilationb ased upconversion (TTAU). [11,12] Moreover,t riplet photosensitizers have been used for oncological and antibacterial photodynamic therapy (PDT) to eradicate cancerous cells or pathogens.…”

Section: Introductionmentioning

confidence: 99%

Visible‐Light Photoactive, Highly Efficient Triplet Sensitizers Based on Iodinated Aza‐BODIPYs: Synthesis, Photophysics and Redox Properties

Gut

Łapok

Drelinkiewicz

et al. 2017

Chemistry An Asian Journal

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As eries of novel iodinated NO 2 -substituted azaBODIPYs have been synthesized and characterized.H ighly desirable photophysical and photochemical properties were induced in NO 2 -substituted aza-BODIPYs by iodinationo ft he pyrrole rings. In particular, highv alues of singlet oxygen quantum yields (F D )r anging from 0.79 to 0.85 were measured. The photooxygenation process proceeds via aT ype II mechanism under the experimental conditions applied. The compounds studied exhibited an absorption band within the so-called "therapeutic window", with l max located between 645 nm to 672 nm. They were non-fluorescent at room temperature with excited singlet-state lifetimes within the picosecond range as measured by femtosecond transient absorption. Nanosecond laser flash photolysis experiments revealed T 1 !T n absorption spanning from ca. 400 nm to ca. 500 nm and allowedd etermination of the triplet-state lifetimes. The estimated triplet lifetimes (t T )i nd eaerated acetonitrile ranged between 2.74 msa nd 3.50 ms. As estimated by CV/DPV measurements, all iodinateda za-BODIPYs studied exhibited one irreversible oxidation and two quasireversible reductions processes. Estimation of the E HOMO gave the value of À6.06 to À6.26 eV while the E LUMO was found to be located at ca. À4.6 eV.T hermogravimetric (TGA) analysis revealed that iodinated aza-BODIPYs weres table up to approximately 300 8C. All compounds studied exhibit high photostability in toluene solution.

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“…23 Waterborne polyurethane (WPU) emulsions, used as paper surface-sizing agents, have recently received increasing concerns in the papermaking industry. 3,24,25 Heretofore, a lot of work has been done on WPU emulsions. WPU is commonly prepared by the incorporation of ionic groups into the PU backbone to enhance the hydrophilicity and promote the water dispersability.…”

Section: Introductionmentioning

confidence: 99%

“…However, few reports on WPU surface sizing agent can be found in the literature. 3,25,45 Guo et al 3,25 studied the water resistance and mechanical properties of paper sized with WPU based on different NCO/OH molar ratio, DMPA content, hard segment structure (TDI/IPDI molar ratio), chemicals-adding sequence, and acetone content. Li et al 45 reported that the water resistance and mechanical properties of paper sheets sized with waterborne UV-curable polyurethane (UWPU) are much better than the unsized paper sheets.…”

Section: Introductionmentioning

confidence: 99%

Properties and paper sizing application of waterborne polyurethanemicroemulsions: Effects of extender, cross‐linker, and polyol

Zhu

Wang

et al. 2016

J of Applied Polymer Sci

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A series of waterborne polyurethane (WPU) microemulsions were synthesized through self‐emulsification methodology, using toluene‐2,6‐diisocyanate, polytetramethylene glycol (PTMG), poly‐caprolactonediol (PCL), and dimethylol propionic acid (DMPA) as monomers; isophorone diamine (IPDA) as chain extender; and aziridine as cross‐linking agent. The resultant WPU microemulsions were utilized as surface‐sizing agents for cellulose fiber paper. The influences of IPDA content, PTMG/PCL molar ratio, and aziridine content on the physicochemical properties of the resultant emulsions and sized paper have been investigated in detail. The WPU microemulsion displayed better surface sizing properties when it was prepared under the following conditions: the IPDA content of 2.96%, PTMG/PCL molar ratio of 0:4, and aziridine content of 2.0 wt %. The relationships between the WPU structure and properties of WPU films and sized paper were clearly illustrated. The mechanical properties and water resistance of sized paper were not only depended on the interactions, chain entanglements, and cross‐linking density among the WPU chains, but also relied on the interactions among polymers and fibers, as well as the polarity and stiffness of surface sizing agent. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43211.

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Direct Photocatalytic S–H Bond Cyanation with Green “CN” Source

Cited by 78 publications

References 74 publications

Quinoidization of π‐Expanded Aromatic Diimides: Photophysics, Aromaticity, and Stability of the Novel Quinoidal Acenes

Quinoidization of π‐Expanded Aromatic Diimides: Photophysics, Aromaticity, and Stability of the Novel Quinoidal Acenes

Visible‐Light Photoactive, Highly Efficient Triplet Sensitizers Based on Iodinated Aza‐BODIPYs: Synthesis, Photophysics and Redox Properties

Properties and paper sizing application of waterborne polyurethanemicroemulsions: Effects of extender, cross‐linker, and polyol

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