𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Twisted Intramolecular Charge Transfer Emission of 2-(4′-N,N-dimethylaminophenyl)benzimidazole in Micelles

✍ Scribed by G Krishnamoorthy; S.K Dogra

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
125 KB
Volume
213
Category
Article
ISSN
0021-9797

No coin nor oath required. For personal study only.

✦ Synopsis

Spectral characteristics of 2-(4N,N-dimethylaminophenyl)benzimidazole have been studied as a function of surfactant concentration and as a function of acid concentration in three surfactants. Dual fluorescence is observed in all the micelles. Fluorescence intensities of the local emission (B band) and twisted intramolecular charge transfer (A band, TICT) increase by an 17-30% and 38 to 64% respectively. When dissolved in micelles lifetimes of both the states also increase in the presence of micelles. The increase in the fluorescence intensities is attributed to the decrease in the non-radiative decay constant. cmc of the surfactants can be determined from the variation in the fluorescence intensity and the lifetime data. The equilibrium constants are determined for the prototropic reactions of the fluorophore in all the micelles in S 0 and S 1 states and the values obtained are discussed.

📜 SIMILAR VOLUMES

Time-dependent density functional theory
Time-dependent density functional theory study on the hydrogen bonding-induced twisted intramolecular charge-transfer excited states of 2-(4′-N,N-dimethylaminophenyl)imidazo[4,5-b]pyridine
✍ Shu-Hui Yin; Yufang Liu; Wei Zhang; Ming-Xing Guo; Peng Song 📂 Article 📅 2010 🏛 John Wiley and Sons 🌐 English ⚖ 296 KB 👁 1 views

## Abstract In this work, the time‐dependent density functional theory (TDDFT) method was carried out to investigate the hydrogen‐bonded intramolecular charge‐transfer excited state of 2‐(4′‐__N__,__N__‐dimethylaminophenyl)imidazo[4,5‐__b__]pyridine (DMAPIP) in methanol (MeOH) solvent. All the geom

AM1 study of the twisted intramolecular
AM1 study of the twisted intramolecular charge transfer phenomenon in p-(N,N-dimethylamino)benzonitrile
✍ T. Soujanya; G. Saroja; A. Samanta 📂 Article 📅 1995 🏛 Elsevier Science 🌐 English ⚖ 689 KB

The twisted intramolecular charge transfer phenomenon in p-(N,N-dimethylamino)benzonitrile has been studied using Austin model 1 (AMI) semi-empirical calculations. A detailed picture of the twisting process is obtained by calculation of the ground and excited state profiles as a function of twist an

Picosecond dynamics of the twisted intra
Picosecond dynamics of the twisted intramolecular charge-transfer state formation of 4- (N,N-dimethylamino) benzonitrile (DMABN) in supercritical fluid solvent
✍ O. Kajimoto; T. Nayuki; T. Kobayashi 📂 Article 📅 1993 🏛 Elsevier Science 🌐 English ⚖ 325 KB

The rate of formation of the intramolecular charge-transfer state of 4-(N,N-dimethylamino)benzonitrile (DMABN) has been determined in supercritical CFsH using a fast single-photon counting technique. The rate constant increases rapidly with increasing CFIH density, indicating the importance of the p

Dual Fluorescence of 2-(4′-N,N-dimethyla
Dual Fluorescence of 2-(4′-N,N-dimethylaminophenyl)pyrido [3,4-d]imidazole in a TritonX-100/n-Hexanol/Water Reverse Micelle in Cyclohexane: Effect of pH and Trifluoroacetic Acid
✍ G. Krishnamoorthy; S.K. Dogra 📂 Article 📅 2000 🏛 Elsevier Science 🌐 English ⚖ 142 KB

The spectral characteristics of 2-(4 -N,N-dimethylaminophenyl)pyrido[3,4-d]imidazole (DMAPPI) have been studied in a TritonX-100 (TX-100)/n-hexanol/water reverse micelle in cyclohexane as a function of water (w 0 ), surfactant, cosurfactant, pH, and trifluoroacetic acid. Under the neutral conditions