UV-light induced domino type reactions: synthesis and photophysical properties of unreported nitrogen ring junction quinazolines

RSC Advances ◽  
2015 ◽  
Vol 5 (47) ◽  
pp. 37415-37423 ◽  
Author(s):  
Jeyakannu Palaniraja ◽  
Selvaraj Mohana Roopan
Keyword(s):  
Uv Light ◽  
Photophysical Properties ◽  
Ring Junction ◽  
Nitrogen Ring

An expedient method for the synthesis of 5,6-dihydrobenzo[h][1,2,4]triazolo[5,1-b]quinazolines by UV light has been developed.

scholarly journals Self-Assembly and Photophysical Studies of an Unusual Red Colored Dye Which Show Green Fluorescence in Cell Imaging

2021 ◽  
Author(s):  
Vivekshinh Kshtriya ◽  
Bharti Koshti ◽  
Ashadul Haque ◽  
Ankit Gangrade ◽  
Ramesh Singh ◽  
...  
Keyword(s):  
Self Assembly ◽  
Cell Imaging ◽  
Uv Light ◽  
Photophysical Properties ◽  
Unexpected Result ◽  
Green Fluorescence ◽  
Self Assembling ◽  
Red Color ◽  
Orange Colour ◽  
First Time

<p>We report for the very first time self-assembly of a red color dye 7-Amino-6h-anthra[9,1-cd][1,2]thiazol-6-one (<b>AAT</b>),its photophysical properties and its applications in cell imaging<b>.</b>Interestingly, <b>AAT </b>show intense red colour in visible light while it shows the orange colour fluorescence under UV light @312nm.Surprisingly, when this dye was used as cell imaging agent it revealed only green fluorescence inside cells and not red. Hence, the photophysical properties of this dye was very intriguing. Further, when self-assembling properties of this dye was examined it revealed formation of tree like branched structures which appeared red both under green and red filter which was again an unexpected result..Interestingly <b>AAT</b> self-assembly also show morphological transition and the branched tree like structures changes to straight fibres as the solvent is changed from DMSO to THF. Hence, the results of self-assembly and cell imaging were contrary to each other and the photophysical properties of this dye is very unusual as compared to conventional dyes. Our future endeavours willaim to understand this anomalous behaviour in greater details in future through various biophysical assays.</p>

scholarly journals Self-Assembly and Photophysical Studies of an Unusual Red Colored Dye Which Show Green Fluorescence in Cell Imaging

2021 ◽  
Author(s):  
Vivekshinh Kshtriya ◽  
Bharti Koshti ◽  
Ashadul Haque ◽  
Ankit Gangrade ◽  
Ramesh Singh ◽  
...  
Keyword(s):  
Self Assembly ◽  
Cell Imaging ◽  
Uv Light ◽  
Photophysical Properties ◽  
Unexpected Result ◽  
Green Fluorescence ◽  
Self Assembling ◽  
Red Color ◽  
Orange Colour ◽  
First Time

<p>We report for the very first time self-assembly of a red color dye 7-Amino-6h-anthra[9,1-cd][1,2]thiazol-6-one (<b>AAT</b>),its photophysical properties and its applications in cell imaging<b>.</b>Interestingly, <b>AAT </b>show intense red colour in visible light while it shows the orange colour fluorescence under UV light @312nm.Surprisingly, when this dye was used as cell imaging agent it revealed only green fluorescence inside cells and not red. Hence, the photophysical properties of this dye was very intriguing. Further, when self-assembling properties of this dye was examined it revealed formation of tree like branched structures which appeared red both under green and red filter which was again an unexpected result..Interestingly <b>AAT</b> self-assembly also show morphological transition and the branched tree like structures changes to straight fibres as the solvent is changed from DMSO to THF. Hence, the results of self-assembly and cell imaging were contrary to each other and the photophysical properties of this dye is very unusual as compared to conventional dyes. Our future endeavours willaim to understand this anomalous behaviour in greater details in future through various biophysical assays.</p>

One-pot synthesis of highly functionalized pyrimido[1,2-b]indazoles via 6-endo-dig cyclization

RSC Advances ◽  
2016 ◽  
Vol 6 (29) ◽  
pp. 24610-24616 ◽  
Author(s):  
Jeyakannu Palaniraja ◽  
Selvaraj Mohana Roopan ◽  
G. Mokesh Rayalu
Keyword(s):  
Efficient Synthesis ◽  
One Pot ◽  
One Pot Synthesis ◽  
Ring Junction ◽  
Nitrogen Ring

An efficient synthesis of nitrogen ring junction pyrimido-indazoles has been developed.

Structural, photocatalytic, and photophysical properties of perovskite MSnO3 (M = Ca, Sr, and Ba) photocatalysts

2007 ◽  
Vol 22 (7) ◽  
pp. 1859-1871 ◽  
Author(s):  
Weifeng Zhang ◽  
Junwang Tang ◽  
Jinhua Ye
Keyword(s):  
Uv Light ◽  
Photophysical Properties ◽  
Pure Water ◽  
High Mobility ◽  
Charge Carriers ◽  
Light Irradiation ◽  
Stoichiometric Ratio ◽  
High Concentration ◽  
Uv Light Irradiation ◽  
Photocatalytic Reactions

The photophysical properties of MSnO3 (M = Ca, Sr, and Ba) including optical absorption, photoluminescence, and energy band structure including band edge positions were investigated experimentally and theoretically in association with their photocatalytic properties. Photocatalytic reactions for H2 and O2 evolution in the case of sacrificial reagents were performed under ultraviolet (UV) light irradiation. The order of the activities of H2 evolution was CaSnO3 > SrSnO3 > BaSnO3, agreeing not only with that of the conduction-band edges (or band gaps) but also with that of the transferred excitation energy, while that of O2 evolution was CaSnO3 < SrSnO3 < BaSnO3, consistent with that of the angle of the Sn–O–Sn bonds as well as the delocalization of excited energy. When loaded with RuO2 cocatalyst, both CaSnO3 and SrSnO3 can efficiently split pure water into hydrogen and oxygen in a stoichiometric ratio under UV light irradiation. In addition, RuO2-loaded SrSnO3 showed higher water splitting activity than RuO2-loaded CaSnO3 did. This is attributed to the suitable conduction and valence band edges and to high mobility of the photogenerated charge carriers caused by the proper distortion of SnO6 connection in SrSnO3. The RuO2-loaded BaSnO3 photocatalyst cannot split pure water, which might be because of a high concentration of defect centers such as Sn2+ ions and the probability of radiative recombination in BaSnO3.

scholarly journals Photochemical Properties and Stability of BODIPY Dyes

2021 ◽  
Vol 22 (13) ◽  
pp. 6735
Author(s):  
Patryk Rybczynski ◽  
Aleksander Smolarkiewicz-Wyczachowski ◽  
Jaroslaw Piskorz ◽  
Szymon Bocian ◽  
Marta Ziegler-Borowska ◽  
...  
Keyword(s):  
Uv Light ◽  
Computational Study ◽  
Photophysical Properties ◽  
Emission Spectra ◽  
Theoretical Data ◽  
Theoretical Description ◽  
Absorption Bands ◽  
Molecular Core ◽  
Wide Group ◽  
Similar Intensity

The present study is devoted to the combined experimental and theoretical description of the photophysical properties and photodegradation of the new boron-dipyrromethene (BODIPY) derivatives obtained recently for biomedical applications, such as bacteria photoinactivation (Piskorz et al., Dyes and Pigments 2020, 178, 108322). Absorption and emission spectra for a wide group of solvents of different properties for the analyzed BODIPY derivatives were investigated in order to verify their suitability for photopharmacological applications. Additionally, the photostability of the analyzed systems were thoroughly determined. The exposition to the UV light was found first to cause the decrease in the most intensive absorption band and the appearance of the hypsochromically shifted band of similar intensity. On the basis of the chromatographic and computational study, this effect was assigned to the detachment of the iodine atoms from the BODIPY core. After longer exposition to UV light, photodegradation occurred, leading to the disappearance of the intensive absorption bands and the emergence of small intensity signals in the strongly blue-shifted range of the spectrum. Since the most intensive bands in original dyes are ascribed to the molecular core bearing the BF2 moiety, this result can be attributed to the significant cleavage of the BF2 ring. In order to fully characterize the obtained molecules, the comprehensive computational chemistry study was performed. The influence of the intermolecular interactions for their absorption in solution was analyzed. The theoretical data entirely support the experimental outcomes.

scholarly journals Synthesis, Photophysical Properties and Catalytic Activity of Ƙ3-SCS Pincer Palladium (II) Complex of N,N'-Di-Tert-Butylbenzene-1,3-Dicarbothioamide Supported by DFT Analysis

2021 ◽  
Author(s):  
Debasish Das ◽  
S. Kannan ◽  
Mukesh Kumar ◽  
Biswajit Sadhu ◽  
Liladhar B. Kumbhare
Keyword(s):  
Catalytic Activity ◽  
Uv Light ◽  
Photophysical Properties ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
13C Nmr Spectroscopy ◽  
Coupling Reactions ◽  
X Ray ◽  
Cross Coupling Reactions ◽  
Vis Spectroscopy

The title complex [PdCl(L)] (1), is obtained from the reaction of SCS pincer ligand HL (where, HL = N,N'-di-tert-butylbenzene-1,3-dicarbothioamide) with lithium tetrachloropalladate (II) in methanol. The compound 1 is characterized by elemental analysis, FTIR, 1H, and 13C-NMR spectroscopy, UV-Vis spectroscopy, powder X-ray diffraction and X-ray crystallographic techniques. At room temperature, 1 emits luminescence light of wavelength 460 nm in the solid state upon excitation by UV light of wavelength 280 nm. The average emission lifetime indicates that, both the ligand and complex emission is fluorescence in nature and involves mainly ligand centers π-π* deexcitation. It also shows good catalytic activity towards Mizoroki-Heck and Suzuki-Miyaura cross-coupling reactions of aryl bromides with tert-butyl acrylate and p-tolylboronic acid respectively. For both type of reactions, more than 99% conversion of the substrates is found to occur for electronically activated p-nitro bromobenzene using 1 mol % of 1. Further, modern DFT calculations are performed to decipher the mechanistic insight on the preferable pathways of the Mizoroki-Heck cross-coupling reaction. Stepwise free energy of reactions for various probable reaction pathways suggest that the catalytic route has profound preference for Pd(0)-Pd(II) over Pd(II)-Pd(IV) pathway.<br>

scholarly journals Synthesis and Photoswitching Properties of Bioinspired Dissymmetric 2,6-Gamma-Pyrone, Analogue of Cyclocurcumin

2021 ◽  
Author(s):  
Jeremy Pecourneau ◽  
Raul Losantos ◽  
Antonio Monari ◽  
Stephane Parant ◽  
Andreea Pasc ◽  
...  
Keyword(s):  
Near Infrared ◽  
Uv Light ◽  
Photophysical Properties ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Order Of Magnitude ◽  
Linear Optical Properties ◽  
Natural Counterpart ◽  
Therapeutic Properties

Cyclocurcumin, a turmeric curcuminoid with potential therapeutic properties, is also a natural photoswitch that may undergo E/Z photoisomerization under UV light. In order to be further exploited in relevant biological applications, photoactivation under near infrared (NIR) irradiation is required. Such requirement can be met through opportune chemical modifications,and most notably by favoring two-photon absorption (TPA) probability. Herein, a general and efficient synthesis of a biomimetic 2,6-g-pyrone analogue of cyclocurcumin is described, motivated by the fact that molecular modeling previews an order of magnitude increase of the NIR TPA cross-section for the latter compared to the natural counterpart. Three retrosynthetic pathways have been identified (i) via an aryl-oxazole intermediate or via an aryl-diynone through (ii) a bottom-up or (iii) a top-down approach. While avoiding the passage through unstable synthons or low yield intermediate reactions, only the latest approach could conveniently afford the 2,6-g-pyrone analogue of cyclocurcumin, in ten steps and with an overall yield of 18%. The photophysical properties of our biomimetic analogue have also been characterized showing an improved photo-isomerization yield over the parent natural compound. The potentially improved non-linear optical properties, as well an enhanced stability, may be correlated to the enforcement of the planarity of the pyrone moiety leading to a quadrupolar D-p-A-p-D system.<br>

Synthesis and Photophysical Properties of Crosslinkable Multi-Branched Ethynyl Fluorene-Labeled Molecules

2012 ◽  
Vol 486 ◽  
pp. 211-213
Author(s):  
Xiao Dan Hu ◽  
Shao Hong Wang ◽  
Zhao Xia Hou
Keyword(s):  
Solid State ◽  
Phase Transfer Catalysis ◽  
Phase Transfer ◽  
Uv Light ◽  
Low Cost ◽  
Photophysical Properties ◽  
Solid State Lighting ◽  
Full Color ◽  
Color Displays

The simple way to synthesize crosslinkable multi-branched ethynyl fluorene-labeled molecules has been reported in this work. A three-armed molecule, OxDBFP is prepared by cyclotrimerization and phase transfer catalysis methods. 3-(6-Bromo-2-oxahexyl)-3-methyloxetane tethered to 9-position of fluorene is crosslinked when exposed to UV light. This kind of compounds can be proper candidates for full-color displays or solid-state lighting by low-cost solution prosessing.

Synthesis and photophysical properties of new Ln(III) (Ln = Eu(III), Gd(III), or Tb(III)) complexes of 1-amidino-O-methylurea

2014 ◽  
Vol 68 (2) ◽  
Author(s):  
L. Singh ◽  
R. Singh
Keyword(s):  
Uv Light ◽  
Photophysical Properties ◽  
Broad Band ◽  
Green Emission ◽  
Spectroscopic Studies ◽  
Emission Characteristic ◽  
Central Metal ◽  
Epr Spectrum ◽  
Paramagnetic Resonance ◽  
The Eu

AbstractThree new solid lanthanide(III) complexes, [Ln(1-AMUH)3] · (NO3)3 (1-AMUH = 1-amidino-O-methylurea; Ln = Eu(III), Gd(III), or Tb(III)) were synthesised and characterised by elemental analysis, infrared spectra, magnetic moment measurement, and electron paramagnetic resonance (EPR) spectra for Gd(III) complex. The formation of lanthanide(III) complexes is confirmed by the spectroscopic studies. The photophysical properties of Gd(III), Eu(III), and Tb(III) complexes in solid state were investigated. The Tb(III) complex exhibits the strongest green emission at 543 nm and the Eu(III) complex shows a red emission at 615 nm while the Gd(III) complex shows a weak emission band at 303 nm. Under excitation with UV light, these complexes exhibited an emission characteristic of central metal ions. The powder EPR spectrum of the Gd(III) complex at 300 K exhibits a single broad band with g = 2.025. The bi-exponential nature of the decay lifetime curve is observed in the Eu(III) and Tb(III) complexes. The results reveal them to have potential as luminescent materials.

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