Synthesis and fluorescence studies of selected N-aryl-2-aminoquinolines: Effect of hydrogen bonding, substituents and ESIPT on their fluorescence quantum yields

2019 ◽  
Vol 208 ◽  
pp. 245-252 ◽  
Author(s):  
Shameer Hisham ◽  
Hairul Anuar Tajuddin ◽  
Chin Fei Chee ◽  
Zainal Abidin Hasan ◽  
Zanariah Abdullah
Keyword(s):  
Hydrogen Bonding ◽  
Quantum Yields ◽  
Fluorescence Studies ◽  
Fluorescence Quantum Yields

Synthesis and Photophysical Properties of 3-(Trifluoromethyl)-2H-imidazo[5,1-a]isoquinolinium Chloride Derivatives

Synlett ◽  
2017 ◽  
Vol 29 (03) ◽  
pp. 296-300 ◽  
Author(s):  
Ali Darehkordi ◽  
Fariba Rahmani ◽  
Mahin Ramezani ◽  
Alireza Bazmandegan-Shamili
Keyword(s):  
Blue Light ◽  
Uv Radiation ◽  
Photophysical Properties ◽  
Molecular Probes ◽  
Quantum Yields ◽  
Light Emitting ◽  
Fluorescence Studies ◽  
Fluorescence Quantum Yields ◽  
Fluorescent Molecular Probes ◽  
Stokes Shifts

A series of novel blue-light-emitting 2H-imidazo[5,1-a]isoquinolinium chloride derivatives were synthesized by the reaction of isoquinoline with trifluoroacetimidoyl chlorides and isocyanides in dry CH2Cl2 in excellent yields. Fluorescence studies showed that the compounds absorb UV radiation and then emit blue light at about 481 nm with moderate to good fluorescence quantum yields. These compounds also showed high Stokes shifts, and can be used to develop ­ultrasensitive fluorescent molecular probes to study a variety of biological events and processes.

Electronic Absorption, MCD and Fluorescence Studies on Phthalocyaninatosilicon Covalently Linked to One or Two TEMPO Radicals

1999 ◽  
Vol 03 (06) ◽  
pp. 439-443 ◽  
Author(s):  
KAZUYUKI ISHII ◽  
YOSHIHARU HIROSE ◽  
NAGAO KOBAYASHI
Keyword(s):  
Electronic Absorption ◽  
Fluorescence Spectra ◽  
Quantum Yields ◽  
Electronic Interaction ◽  
Excited Singlet ◽  
Excited Triplet ◽  
Fluorescence Studies ◽  
Fluorescence Quantum Yields ◽  
Allowed Transition ◽  
Covalently Linked

The UV-vis absorption, MCD and fluorescence spectra of phthalocyaninatosilicon ( SiPc ) covalently linked to one or two TEMPO radicals have been studied in comparison with those of (dihydroxy) SiPc . The electronic absorption and MCD spectra show little change on substitution of TEMPO radicals, indicating that the electronic interaction between excited singlet SiPc (1 SiPc *) and doublet TEMPO (2 TEMPO ) is very weak or non-existent. In contrast, fluorescence quantum yields decrease markedly with increasing number of TEMPO radicals. This result is interpreted reasonably by assuming that the decay from 1 SiPc * to excited triplet SiPc (3 SiPc *) partially becomes a spin-allowed transition owing to the interaction between 3 SiPc * and 2 TEMPO .

Rôle de la liaison hydrogène intra et intermoléculaire dans l'étude des propriétés spectroscopiques et photophysiques. Cas types: dérivés du carbazole

1985 ◽  
Vol 63 (7) ◽  
pp. 1723-1733 ◽  
Author(s):  
Pierre D. Harvey ◽  
Gilles Durocher
Keyword(s):  
Hydrogen Bonding ◽  
Intramolecular Hydrogen Bonding ◽  
Quantum Yields ◽  
Fluorescence Quantum Yields ◽  
Bonding System ◽  
Hydrogen Bonding System ◽  
Entropy Of Complexation ◽  
Enthalpy And Entropy ◽  
Intramolecular Hydrogen ◽  
Derivatives Of

The absorption and fluorescence spectra along with the fluorescence quantum yields and lifetimes of the 1-cyano and 1-carboethoxy derivatives of carbazole in polar and non-polar fluids and in rigid solutions at 77 K have been investigated. The existence of the cyclic dimer has been confirmed for 1-cyanocarbazole in 3-methylpentane. The enthalpy and entropy of complexation are evaluated to be −39 kJ mol−1 and −78 J mol−1 K−1 respectively. No tautomeric species has been observed following excitation of the dimer. On the other hand, the intramolecular hydrogen bonding system always predominates in the gas phase and in non-polar solvents in the ground electronic state. This intramolecular hydrogen bonding has been shown to be broken in ethanol, where intermolecular hydrogen bonding to the solvent takes place. 1-Cyano carbazole follows the same behaviour in ethanol. All the 1-substituted derivatives of carbazole show exciplex fluorescence in ethanol and the formation of these exciplexes has been explained by the strong charge transfer character involved in the excited 1Lb states of these molecules.

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.

Steric Effects in the Electronic Spectra of the 3,5-Diarylaminobenzene Derivatives

1986 ◽  
Vol 41 (11) ◽  
pp. 1311-1314 ◽  
Author(s):  
A. Balter ◽  
W. Nowak ◽  
P. Milart ◽  
J. Sepioł
Keyword(s):  
Excited State ◽  
Electronic Spectra ◽  
Fluorescence Properties ◽  
Steric Effects ◽  
Quantum Yields ◽  
Spectroscopic Behaviour ◽  
Fluorescence Quantum Yields ◽  
Excited State Lifetimes ◽  
Methyl Phenyl

Absorption and fluorescence properties, excited state lifetimes and fluorescence quantum yields were determined for a series of 3,5-diarylaminobenzene derivatives in solvents of different polarities. The role of the nitrile, methyl, phenyl and naphthyl substituents is discussed. Especially the steric effects on the spectroscopic behaviour of the investigated molecules are studied.

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