Control between TICT and PET using chemical modification of N-phenyl-9-anthracenecarboxamide and its application to a crown ether type chemosensor
TL;DR: Both twisted intramolecular charge transfer (TICT) and photo-induced electron transfer (PET) relaxation processes of N-phenyl-9-anthrylcarboxamide derivatives can be characterized by modified substitution of the phenyl group.
About: This article is published in Tetrahedron.The article was published on 2008-11-17. It has received 19 citations till now. The article focuses on the topics: Crown ether & Phenyl group.
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TL;DR: A carbonyl group was positioned between 1,8-naphthalimide and di-2-picolylamine (DPA) and played a key role of displaying fluorescence enhancements with heavy and transition metal (HTM) ions through increasing the oxidation potential of the fluorophore.
129 citations
TL;DR: In this article, a benzimidazole-based, anthracene-coupled fluorescent receptor capable of recognizing and estimating the concentrations of Fe3+ in semi-aqueous solution by ratiometric estimation is presented.
50 citations
01 Oct 2015
TL;DR: A significantly expanded library of materials, including dipeptides conjugated to carbazole, phenanthracene, anthracenes, pyrene and substituted naphthalenes are reported, including those containing a phenylalanine as either of the constituent amino acids are much more likely to lead to a gelator being formed.
Abstract: Functionalised dipeptides are a class of interesting and useful low molecular weight hydrogelators Here, we report a significantly expanded library of materials, including dipeptides conjugated to carbazole, phenanthracene, anthracene, pyrene and substituted naphthalenes We assess the effect of using two different gelation methods; a pH-switch and a solvent switch on the gelation behaviour and properties of the dipeptides Importantly, we investigate the relationship between the structure of these dipeptides and their ability to form gels From an analysis of the gelation ability of all these dipeptides, it is clear that those containing a phenylalanine as either of the constituent amino acids are much more likely to lead to a gelator being formed as opposed to using non-aromatic amino acids only
28 citations
TL;DR: Experimental results showed the potential use of BCzPCz as a fluorescence probe and as two-photon absorption material and its potential use as a ICT complex formation in singlet excited state.
Abstract: A carbazole-based compound with intramolecular charge transfer (ICT) characteristics, 3,6-bis-((N-ethylcarbazole-3-)-propene-1-keto)-N-ethylcarbazole (BCzPCz) was synthesized by N-alkylation, acetylation and aldol condensation. BCzPCz was further confirmed by IR and 1 H NMR. The central N-ethylcarbazole was connected with two N-ethylcarbazole units through the propenone group in BCzPCz. N-ethylcarbazole and carbonyl groups were electron donors (D) and acceptors (A), respectively. The UV–vis absorption and fluorescence characteristics of BCzPCz were also investigated in different solvents. Solvatochromism was attributed to ICT complex formation in singlet excited state. Magnitude of the change in the dipole moment was 24.78 D according to Lippert-Mataga equation. Fluorescence of BCzPCz was significantly affected by pH and was quenched in acidic medium. Fluorescence quantum yield of BCzPCz was 0.516 in ethanol. Experimental results showed its potential use as a fluorescence probe and as two-photon absorption material. Copyright © 2012 John Wiley & Sons, Ltd.
20 citations
TL;DR: In this paper, a review highlights the development of various fluorescent and colorimetric chemosensors based on anthracene for various metal ions and anions since 2005, classified into various categories on the basis nature of target ion.
19 citations
References
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01 Jan 1973
TL;DR: Hammett et al. as discussed by the authors proposed a triplet-state diffusion-controlled triplet state diffusion-controlled rate for photolysis of organic molecules in solution, where triplets are derived from triplets of the triplets.
Abstract: . Photophysics of Organic Molecules in Solution Triplet-State Energies: Ordered Flash Photolysis: Designing Experiments Low Temperature Photophysics of Organic Molecules Ground-State Absorption Spectra ESR and ODMR Parameters of the Triplet State Diffusion-Controlled Rate Constants Rate Constants of Singlet-State Quenching Rate Constants of Triplet-State Quenching Ionization Energies, Electron Affinities, and Redox Potentials of Organic Compounds Bond Dissociation Energies Solvent Properties Chemical Actinometry Transmission Characteristics of Light Filters and Glasses Spectral Distribution of Photochemical Sources Spin-Orbit Coupling Fundamental Constants and Conversion Factors Hammett (T Constants Bibliography and Indexes References Compound Name Index Molecular Formula Index
2,513 citations
TL;DR: A receptor is described that operates as a logic device with two input channels: the fluorescence signal depends on whether the molecule binds hydrogen ions, sodium ions or both and the input/output characteristics of this molecular device correspond to those of an AND gate.
Abstract: MOLECULES that perform logic operations are prerequisites for molecular information processing and computation1–11. We12,13 and others14–16 have previously reported receptor molecules that can be considered to perform simple logic operations by coupling ionic bonding or more complex molecular-recognition processes with photonic (fluorescence) signals: in these systems, chemical binding (the 'input') results in a change in fluorescence intensity (the 'output') from the receptor. Here we describe a receptor (molecule (1) in Fig. 1) that operates as a logic device with two input channels: the fluorescence signal depends on whether the molecule binds hydrogen ions, sodium ions or both. The input/output characteristics of this molecular device correspond to those of an AND gate.
1,059 citations
TL;DR: In this paper, the existence of two excited species differing in polarity and in the orientation of the N(CH 3 ) 2 group has been attributed to the presence of an excimer.
724 citations