scholarly journals Fluorescence Quantum Yields and Lifetimes of Annatto Aqueous Solutions Dependent on Hydrogen Potential: Applications in adulterated milk

2021 ◽  
pp. 100080
Author(s):  
Tácio T.S. Santos ◽  
Larissa R. Lourenço ◽  
Sthanley R. de Lima ◽  
Luiz R. Goulart ◽  
Djalmir N. Messias ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Quantum Yields ◽  
Fluorescence Quantum Yields ◽  
Potential Applications

High-Quality Water-Soluble Core/Shell/Shell CdSe/CdS/ZnS Quantum Dots Balanced by Ionic and Nonionic Hydrophilic Capping Ligands

NANO ◽  
2016 ◽  
Vol 11 (07) ◽  
pp. 1650073 ◽  
Author(s):  
Lu Liu ◽  
Hu Xu ◽  
Bing Shen ◽  
Xinhua Zhong
Keyword(s):  
Quantum Dots ◽  
Colloidal Stability ◽  
Water Soluble ◽  
Quantum Yields ◽  
Surface Charges ◽  
Fluorescence Quantum Yields ◽  
Carboxylic Groups ◽  
Potential Applications ◽  
High Fluorescence ◽  
Capping Ligands

Pentaerythritol tetrakis 3-mercaptopropionate (PTMP) grafted poly(acryl acid) (PAA) ionic hydrophilic oligomer PAA-PTMP (PP) and dihydrolipoic acid (DHLA) grafted methoxypoly(ethylene glycol) (mPEG) nonionic hydrophilic oligomer mPEG-DHLA (PD) have been designed, synthesized and used as co-capping ligands in water-solubilization of hydrophobic quantum dots (QDs) via ligand exchange. The obtained oligomers with multi-thiol groups could bind strongly to the surface atoms of QDs. Meanwhile, the carboxyl groups (from PP) and mPEG segment (from PD) can render QDs water-soluble, and the free carboxylic groups can possibly be used for the further bioconjugation. The resulting water-soluble QDs have been characterized by ultraviolet-visible (UV-Vis), fluorescence, Fourier transform infrared (FTIR) spectroscopy as well as transmission electron microscopy (TEM) and dynamic light scattering (DLS) techniques. The water-soluble QDs have relatively small hydrodynamic size (10[Formula: see text]12 nm), and importantly, retain high fluorescence quantum yields (up to 45%) compared with that of the originally hydrophobic QDs (49%). In addition, they have tunable surface charges and show excellent colloidal stability over a relatively broad pH range ([Formula: see text]), in high salt concentration, and even after thermal treatment at 100[Formula: see text]C. These results indicate that the water-soluble QDs coated by PP and PD oligomers have potential applications in cellular imaging and biosensor.

scholarly journals Fluorofluorescent Perylene Bisimides

Synlett ◽  
2018 ◽  
Vol 29 (19) ◽  
pp. 2509-2514 ◽  
Author(s):  
Timothy Swager ◽  
Kosuke Yoshinaga
Keyword(s):  
Organic Solvents ◽  
Photophysical Properties ◽  
Quantum Yields ◽  
Phase Solubility ◽  
Perylene Bisimide ◽  
Fluorescence Quantum Yields ◽  
High Quantum ◽  
Potential Applications ◽  
The Many ◽  
Perylene Bisimides

Perfluorinated liquids can exhibit immiscibility with organic solvents and water, and provide orthogonal opportunities in chemistry. Examples of emissive dyes that display only fluorous phase solubility are limited, despite the many potential applications. Perylene bisimides are among the most versatile dyes and are known for their outstanding stability and high quantum yields. Herein, we report the synthesis of two new “fluorofluorescent” perylene bisimide dyes, designed to be soluble in the fluorous phases. These two dyes possess unique photophysical properties, including dramatic increases in fluorescence quantum yields when treated with Brønsted acids as well as aggregation in the fluorous phase.

X-Ray Induced Luminescence in Aqueous Solutions of Aminobenzoic Acids

1974 ◽  
Vol 29 (3-4) ◽  
pp. 245-253 ◽  
Author(s):  
W. A. Prütz
Keyword(s):  
Aqueous Solutions ◽  
Light Emission ◽  
Quantum Yields ◽  
Spectral Change ◽  
X Ray ◽  
Fluorescence Quantum Yields ◽  
Aminobenzoic Acids ◽  
X Irradiation ◽  
Related Compounds ◽  
Absolute Fluorescence

Light emission induced by x-irradiation of deaerated aqueous solutions of anthranilic acid (AH) is predominantly due to chemiluminescence. Within the range of pH 3.5 to pH 12 only emission of the anion (A-) is observed, in contrast to the fluorescence which exhibits a characteristic spectral change under the protolytic equilibrium A- + H+ = AH (pK = 4.805). The chemiluminescence is proposed to involve reaction of eaq with the anthranilo radical Ø(NH2)+COO-, formed by OH attack upon A- or AH. Deprotonation of Ø(NH2)+COO- occurs at pH > 7. Absolute yields of the x-ray induced emissions and absolute fluorescence quantum yields have been determined for the aminobenzoic acid isomers and for some related compounds.

Synthesis and Properties of the Bipolar Triphenylamine-benzimidazole Derivatives

2010 ◽  
Vol 63 (4) ◽  
pp. 712 ◽  
Author(s):  
Hai-Ying Wang ◽  
Gang Chen ◽  
Xiao-Ping Xu ◽  
Shun-Jun Ji
Keyword(s):  
Calculated Data ◽  
Quantum Yields ◽  
Benzimidazole Derivatives ◽  
Thermal Stabilities ◽  
1H And 13C Nmr ◽  
Light Emitting ◽  
Fluorescence Quantum Yields ◽  
Hole Transporting ◽  
Potential Applications ◽  
High Fluorescence

A series of newly-developed bipolar triphenylamine benzimidazole derivatives, containing both hole-transporting and electron-transporting moieties, have been completely characterized by 1H and 13C NMR and HRMS, as well as their thermal, optical, and electrochemical properties. The results indicate that these compounds exhibit high fluorescence quantum yields, desirable HOMO levels and high thermal stabilities. Quantum chemical calculations were used to obtain the optimized ground-state geometries, spatial distributions of the HOMO, and the LUMO levels of these compounds. The agreement between experimental and calculated data suggests such compounds may have potential applications in organic light emitting diodes materials.

Regioselective Oxidative Cross-Coupling Reaction: Synthesis of Imidazo[1,2-a]pyridine Fluorophores

Synthesis ◽  
2021 ◽  
Author(s):  
Xianglong Chu ◽  
Yadi Niu ◽  
Chen Ma ◽  
Xiaodong Wang ◽  
Yunliang Lin ◽  
...  
Keyword(s):  
Photophysical Properties ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Quantum Yields ◽  
Fluorescence Quantum Yields ◽  
Cross Coupling Reaction ◽  
Color Tunable ◽  
Palladium Catalyzed ◽  
Structure Relationship ◽  
High Fluorescence

AbstractA rapid access to a series of N-heteroarene fluorophores has been developed on the basis of the palladium-catalyzed direct oxidative C–H/C–H coupling of imidazo[1,2-a]pyridines with thiophenes/furans. The photophysical properties–structure relationship was systematically investigated. The resulting N-heteroarene fluorophores present color-tunable emissions (λem: 431–507 nm in CH2Cl2) and high fluorescence quantum yields (up to 91% in CH2Cl2).

scholarly journals Indenopyrans – synthesis and photoluminescence properties

2016 ◽  
Vol 12 ◽  
pp. 825-834 ◽  
Author(s):  
Andreea Petronela Diac ◽  
Ana-Maria Ţepeş ◽  
Albert Soran ◽  
Ion Grosu ◽  
Anamaria Terec ◽  
...  
Keyword(s):  
Solid State ◽  
Emission Band ◽  
Fluorescence Spectra ◽  
Photophysical Properties ◽  
Quantum Yields ◽  
Band Broadening ◽  
Photoluminescence Properties ◽  
Fluorescence Quantum Yields ◽  
Blue Emitters ◽  
Solid State Fluorescence

New indeno[1,2-c]pyran-3-ones bearing different substituents at the pyran moiety were synthesized and their photophysical properties were investigated. In solution all compounds were found to be blue emitters and the trans isomers exhibited significantly higher fluorescence quantum yields (relative to 9,10-diphenylanthracene) as compared to the corresponding cis isomers. The solid-state fluorescence spectra revealed an important red shift of λmax due to intermolecular interactions in the lattice, along with an emission-band broadening, as compared to the solution fluorescence spectra.

Impact of cyclic topology: odd–even glass transition temperatures and fluorescence quantum yields in molecularly-defined macrocycles

2017 ◽  
Vol 8 (17) ◽  
pp. 2686-2692 ◽  
Author(s):  
Kun Li ◽  
Ganquan Jiang ◽  
Feng Zhou ◽  
Lishan Li ◽  
Zhengbiao Zhang ◽  
...  
Keyword(s):  
Glass Transition ◽  
Intermolecular Interactions ◽  
Topological Structure ◽  
Quantum Yields ◽  
Transition Temperatures ◽  
Glass Transition Temperatures ◽  
Fluorescence Quantum Yields

The topological structure of cyclic-TPEn+1 (n = 1–6) induces odd–even effects on the Tg and AIE behavior, arising from the alternation of intermolecular interactions.

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