scholarly journals Novel light-emitting clays with structural Tb3+ and Eu3+ for chromate anion detection

RSC Advances ◽  
2020 ◽  
Vol 10 (50) ◽  
pp. 29765-29771 ◽  
Author(s):  
Stefano Marchesi ◽  
Chiara Bisio ◽  
Fabio Carniato
Keyword(s):  
Photophysical Properties ◽  
Luminescent Materials ◽  
One Pot ◽  
Light Emitting ◽  
Anion Detection ◽  
Fluorescent Sensing ◽  
Chromate Anion ◽  
First Time ◽  
Synthetic Saponite

For the first time, Tb3+ and Eu3+ were incorporated into the framework of synthetic saponite by a one-pot hydrothermal procedure, obtaining luminescent materials with interesting photophysical properties, exploited for the fluorescent sensing of the chromate anion in water.

scholarly journals Et3N/DMSO-supported one-pot synthesis of highly fluorescent β-carboline-linked benzothiophenones via sulfur insertion and estimation of the photophysical properties

2020 ◽  
Vol 16 ◽  
pp. 1740-1753 ◽  
Author(s):  
Dharmender Singh ◽  
Vipin Kumar ◽  
Virender Singh
Keyword(s):  
Transition Metal ◽  
Elemental Sulfur ◽  
Photophysical Properties ◽  
Quantum Yields ◽  
One Pot ◽  
Light Emitting ◽  
Metal Free ◽  
One Pot Synthesis ◽  
Synthetic Strategy ◽  
Reaction Proceeds

A robust transition-metal-free strategy is presented to access novel β-carboline-tethered benzothiophenone derivatives from 1(3)-formyl-β-carbolines using elemental sulfur activated by Et3N/DMSO. This expeditious catalyst-free reaction proceeds through the formation of β-carboline-based 2-nitrochalcones followed by an incorporation of sulfur to generate multifunctional β-carboline-linked benzothiophenones in good to excellent yields. The synthetic strategy could also be extended towards the synthesis of β-carboline-linked benzothiophenes. Moreover, the afforded products emerged as promising fluorophores and displayed excellent light-emitting properties with quantum yields (ΦF) up to 47%.

scholarly journals Sulfur Versus Nitrogen Chelation in C-H Activation: Cobalt(III)-Catalyzed Unsymmetrical Double Annulation of Thioamides

2021 ◽  
Author(s):  
Majji Shankar ◽  
Arijit Saha ◽  
Somratan Sau ◽  
Arghadip Ghosh ◽  
Vincent Gandon ◽  
...  
Keyword(s):  
Density Functional ◽  
Chemical Space ◽  
Photophysical Properties ◽  
Structural Diversity ◽  
One Pot ◽  
Functional Theory ◽  
Biologically Relevant ◽  
Drug Candidates ◽  
Isoquinoline Derivatives ◽  
First Time

An unconventional cobalt(III)-catalyzed one-pot domino double annulation of aryl thioamides with unactivated alkynes is presented. Sulfur (S), nitrogen (N), and o,o'-C-H bonds of aryl thioamides are involved in this reaction, enabling access to rare 6,6-fused thiopyrano-isoquinoline derivatives. A reverse ‘S’ coordination over more conventional ‘N’ coordination of thioamides to Co-catalyst specifically regulates the formation of four [C-C and C-S at first and then C-N and C-C] bonds in a single operation, a concept which is uncovered for the first time. The power of the N-masked methyl phenyl sulfoximine (MPS) directing group in this annulation sequence is established. The transformation is successfully developed, building a novel chemical space of structural diversity (56 examples). In addition, late-stage annulation of biologically relevant motifs and drug candidates are disclosed (17 examples). Preliminary photophysical properties of thiopyrano-isoquinoline derivatives are discussed. Density functional theory (DFT) studies authenticate the participation of a unique 6p-electrocyclization of a 7-membered S-chelated cobaltacycle in the annulation process.<br>

Facile One-Step Preparation and Efficient Photocatalytic Hydrogen Production of Composite MoS2/g-C3N4 Sensitized by Erythrosin B

NANO ◽  
2020 ◽  
Vol 15 (10) ◽  
pp. 2050127
Author(s):  
Mingcai Yin ◽  
Yixian Li ◽  
Kaiyue Liang ◽  
Jiangfan Sun ◽  
Yaoting Fan ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Photophysical Properties ◽  
Production Performance ◽  
One Pot ◽  
Photocatalytic Hydrogen Production ◽  
Erythrosin B ◽  
Production Activity ◽  
One Step ◽  
Calcination Method ◽  
First Time

MoS2/g-C3N4 (g-C3N4 [Formula: see text] graphitic carbon nitride) composite is considered as a promising photocatalyst for hydrogen production, while the preparation method still needs to be improved. Herein for the first time, nanosized MoS3 and melamine were used as starting materials and a facile one-pot calcination method was successfully applied for the synthesis of MoS2/g-C3N4. The physical and photophysical properties of the as-prepared MoS2/g-C3N4 were characterized by XRD, IR, SEM, TEM and XPS techniques. Sensitized by Erythrosin B (EB), the photocatalytic hydrogen production performance of MoS2/g-C3N4 was investigated and the amount of MoS2 was optimized. An excellent H2 production activity of 1091.2[Formula: see text][Formula: see text] was achieved for 43% MoS2/g-C3N4, which is about 330 times that of pure g-C3N4 (3.3[Formula: see text][Formula: see text]. In addition, its performance was compared with those of three other MoS2/g-C3N4 samples prepared by conventional methods and a possible mechanism of H2 production was proposed based on the photoluminescence and photoelectrochemical results.

scholarly journals Sulfur Versus Nitrogen Chelation in C-H Activation: Cobalt(III)-Catalyzed Unsymmetrical Double Annulation of Thioamides

2021 ◽  
Author(s):  
Majji Shankar ◽  
Arijit Saha ◽  
Somratan Sau ◽  
Arghadip Ghosh ◽  
Vincent Gandon ◽  
...  
Keyword(s):  
Density Functional ◽  
Chemical Space ◽  
Photophysical Properties ◽  
Structural Diversity ◽  
One Pot ◽  
Functional Theory ◽  
Biologically Relevant ◽  
Drug Candidates ◽  
Isoquinoline Derivatives ◽  
First Time

An unconventional cobalt(III)-catalyzed one-pot domino double annulation of aryl thioamides with unactivated alkynes is presented. Sulfur (S), nitrogen (N), and o,o'-C-H bonds of aryl thioamides are involved in this reaction, enabling access to rare 6,6-fused thiopyrano-isoquinoline derivatives. A reverse ‘S’ coordination over more conventional ‘N’ coordination of thioamides to Co-catalyst specifically regulates the formation of four [C-C and C-S at first and then C-N and C-C] bonds in a single operation, a concept which is uncovered for the first time. The power of the N-masked methyl phenyl sulfoximine (MPS) directing group in this annulation sequence is established. The transformation is successfully developed, building a novel chemical space of structural diversity (56 examples). In addition, late-stage annulation of biologically relevant motifs and drug candidates are disclosed (17 examples). Preliminary photophysical properties of thiopyrano-isoquinoline derivatives are discussed. Density functional theory (DFT) studies authenticate the participation of a unique 6p-electrocyclization of a 7-membered S-chelated cobaltacycle in the annulation process.<br>

Multi-Fold Sonogashira Coupling, A New Convenient Approach to Tetraalkynyl Anthracenes with Tunable Photophysical Properties

2021 ◽  
Author(s):  
Khadimul Islam ◽  
Himani Narjinari ◽  
AKSHARA BISARYA ◽  
Akshai Kumar
Keyword(s):  
Photophysical Properties ◽  
Single Step ◽  
Sonogashira Coupling ◽  
One Pot ◽  
Convenient Approach ◽  
First Time

For the first time a direct single-step one-pot route to access nine new symmetric tetraalkynylated anthracenes via the Pd(CH3CN)2Cl2/ cataCXium®A catalyzed tetra-fold Sonogashira coupling is reported. Five of these tetraalkynylated...

scholarly journals Et3N-DMSO Supported One-pot Synthesis of Highly Fluorescent β-Carboline Linked Benzothiophenones via Sulphur Insertion and Estimation of Their Photophysical Properties

2020 ◽  
Author(s):  
Dharmender Singh ◽  
Vipin Kumar ◽  
Virender Singh
Keyword(s):  
Quantum Yield ◽  
Transition Metal ◽  
Photophysical Properties ◽  
Elemental Sulphur ◽  
One Pot ◽  
Light Emitting ◽  
Metal Free ◽  
One Pot Synthesis ◽  
Synthetic Strategy ◽  
Reaction Proceeds

A robust transition metal-free strategy is presented to access novel β-carboline tethered benzothiophenone derivatives from 1(3)-formyl-β-carbolines using elemental sulphur activated by Et3N/DMSO. This expeditious catalyst-free reaction proceeds through the formation of β-carboline based 2-nitrochalcones followed by incorporation of sulphur to generate the multifunctional β-carboline linked benzothiophenones in good to excellent yields. The synthetic strategy can also be extended towards the synthesis of β-carboline linked benzothiophenes. Moreover, the products as afforded thereof emerged as promising fluorophores and displayed excellent light-emitting properties with quantum yield (ΦF) upto 47%.

Probing local photophysical properties in perovskite based light-emitting devices

2019 ◽  
Author(s):  
Miguel Anaya ◽  
Kyle Frohna ◽  
Linsong Cui ◽  
Javad Shamsi ◽  
Sam Stranks
Keyword(s):  
Photophysical Properties ◽  
Light Emitting ◽  
Light Emitting Devices

An Expeditious One-Pot Three-Component Synthesis of 4-Aryl-3,4-dihydrobenzo[g] quinoline-2,5,10(1H)-triones under Green Conditions

2020 ◽  
Vol 23 (23) ◽  
pp. 2626-2634
Author(s):  
Saiedeh Kamalifar ◽  
Hamzeh Kiyani
Keyword(s):  
Reaction Medium ◽  
Meldrum's Acid ◽  
Meldrum’S Acid ◽  
One Pot ◽  
One Pot Synthesis ◽  
Substituted Benzaldehydes ◽  
High Yields ◽  
First Time ◽  
Green Conditions

: An efficient and facial one-pot synthesis of 4-aryl-3,4-dihydrobenzo[g]quinoline- 2,5,10(1H)-triones was developed for the first time. The process proceeded via the three-component cyclocondensation of 2-amino-1,4-naphthoquinone with Meldrum’s acid and substituted benzaldehydes under green conditions. The fused 3,4-dihydropyridin-2(1H)- one-ring naphthoquinones have been synthesized with good to high yields in refluxing ethanol as a green reaction medium. This protocol is simple and effective as well as does not involve the assistance of the catalyst, additive, or hazardous solvents.

scholarly journals Exciton Coupling and Conformational Changes Impacting the Excited State Properties of Metal Organic Frameworks

Molecules ◽  
2020 ◽  
Vol 25 (18) ◽  
pp. 4230
Author(s):  
Andreas Windischbacher ◽  
Luca Steiner ◽  
Ritesh Haldar ◽  
Christof Wöll ◽  
Egbert Zojer ◽  
...  
Keyword(s):  
Conformational Changes ◽  
Photophysical Properties ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Red Shift ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Exciton Coupling ◽  
Metal Organic ◽  
Crystalline Metal

In recent years, the photophysical properties of crystalline metal-organic frameworks (MOFs) have become increasingly relevant for their potential application in light-emitting devices, photovoltaics, nonlinear optics and sensing. The availability of high-quality experimental data for such systems makes them ideally suited for a validation of quantum mechanical simulations, aiming at an in-depth atomistic understanding of photophysical phenomena. Here we present a computational DFT study of the absorption and emission characteristics of a Zn-based surface-anchored metal-organic framework (Zn-SURMOF-2) containing anthracenedibenzoic acid (ADB) as linker. Combining band-structure and cluster-based simulations on ADB chromophores in various conformations and aggregation states, we are able to provide a detailed explanation of the experimentally observed photophysical properties of Zn-ADB SURMOF-2: The unexpected (weak) red-shift of the absorption maxima upon incorporating ADB chromophores into SURMOF-2 can be explained by a combination of excitonic coupling effects with conformational changes of the chromophores already in their ground state. As far as the unusually large red-shift of the emission of Zn-ADB SURMOF-2 is concerned, based on our simulations, we attribute it to a modification of the exciton coupling compared to conventional H-aggregates, which results from a relative slip of the centers of neighboring chromophores upon incorporation in Zn-ADB SURMOF-2.

Sign in / Sign up

Export Citation Format

Share Document