Endowing Nitro-Compounds with Bright and Stimuli-Responsive Luminescence Based on Propeller-Like AIEgens

2021 ◽  
Author(s):  
Riqing Ding ◽  
Ke Qin ◽  
Huili Sun ◽  
Shasha Zhou ◽  
Sidan Guo ◽  
...  
Keyword(s):  
Fluorescence Quenching ◽  
Nitro Group ◽  
Nitro Compounds ◽  
Luminescent Materials ◽  
Stimuli Responsive ◽  
Formidable Challenge ◽  
Higher Sensitivity

The electron-rich nitro group, having higher sensitivity to environments, is attractive for constructing stimuli-responsive luminescent materials. However, it also causes the fluorescence quenching of luminogens, making a formidable challenge to...

Fluoreszenzlöschung alternierender und nicht-alternierender polycyclischer aromatischer Kohlenwasserstoffe durch Nitroverbindungen / Fluorescence Quenching of Alternant and Non-alternant Polycyclic Hydrocarbons by Nitro Compounds

1977 ◽  
Vol 32 (12) ◽  
pp. 1561-1563 ◽  
Author(s):  
M. Zander
Keyword(s):  
Electron Transfer ◽  
Fluorescence Quenching ◽  
Excitation Energy ◽  
Reduction Potential ◽  
Nitro Compounds ◽  
Polycyclic Hydrocarbons ◽  
Electron Transfer Mechanism ◽  
Diffusion Controlled ◽  
Polycyclic Aromatic ◽  
Alternant Hydrocarbons

Abstract Fluorescence Quenching of Alternant and Non-alternant Polycyclic Hydrocarbons by Nitro Compounds Fluorescence quenching of polycyclic aromatic hydro­ carbons by nitromethane or nitrobenzene in fluid solutions is due to an electron transfer mechanism. The non diffusion controlled rate constant of quenching is very much greater for alternant than for non-alternant hydrocarbons with equal singlet excitation energy. This is explained by the known more positive reduction potential of non-alternant compared to alternant hydrocarbons.

Simple Synthesis of Dimethyl Nitrobenzhydrylphosphonates and Heteroarylnitroarylacetonitriles via Vicarious Nucleophilic Substitution (VNS) Reaction

Synthesis ◽  
2020 ◽  
Vol 53 (01) ◽  
pp. 175-181
Author(s):  
Mieczysław Mąkosza ◽  
Małgorzata Bechcicka ◽  
Krzysztof Wojciechowski
Keyword(s):  
Nucleophilic Substitution ◽  
Nitro Group ◽  
Nitro Compounds ◽  
Simple Synthesis ◽  
Para Position ◽  
Crucial Step ◽  
Vicarious Nucleophilic Substitution ◽  
Aromatic Nitro Compounds ◽  
Leaving Group ◽  
Aromatic Nitro

Acetals of dimethyl phenyl- and heteroaryl-α-hydroxymethanephosphonates were deprotonated to generate carbanions, which enter the vicarious nucleophilic substitution (VNS) of hydrogen in aromatic nitro compounds to form 4-nitrobenzhydrylphosphonates and α-heteroaryl-4-nitrobenzylphosphonates. Similarly acetals of cyano­hydrins of heteroaromatic aldehydes (furfural and 2-formylthiophene) react to form heteroaryl 4-nitroarylacetonitriles. The anion of the hemiacetal of acetaldehyde is an efficient leaving group in the base-induced β-elimination step – the crucial step in the VNS reaction. The reaction selectively occurred at the para-position to the nitro group.

A conformationally switchable fluorescent oligophenol foldamer for selective sensing of copper(ii) ions

RSC Advances ◽  
2014 ◽  
Vol 4 (97) ◽  
pp. 54469-54473 ◽  
Author(s):  
Jiaqiang Liu ◽  
Chang Sun ◽  
Wenliang Ma ◽  
Yu-Jing Lu ◽  
Lin Yu ◽  
...  
Keyword(s):  
Fluorescence Quenching ◽  
Metal Ion ◽  
Stimuli Responsive

A stimuli-responsive hexameric oligophenol host undergoes amine-induced co-operative folding and fluorescence quenching, enabling easy classification of the bound metal ion guests as well as selective sensing of Cu2+ ions.

The possibilities of polarography in the chemistry of nitroazoles

1984 ◽  
Vol 49 (6) ◽  
pp. 1342-1353 ◽  
Author(s):  
Dragica Dumanović ◽  
Janka Ćirić ◽  
Djuro Kosanović ◽  
Dragoslav Jeremić
Keyword(s):  
Nitro Group ◽  
Systematic Investigation ◽  
Nitro Compounds ◽  
The Other ◽  
Polarographic Method ◽  
Spectrophotometric Methods ◽  
Group Position ◽  
High Yields

Based on systematic investigation of mononitroimidazoles, selective polarographic and spectrophotometric methods for determination of nitrazole compounds in reaction mixture are proposed. It was proved that the selectivity is based on the different properties of the nitro group due to the effects of the nitro group position in the ring, the type and position of the other substituents and on the fact whether the compound is N-substituted or not. The proposed methods can be successfully used for monitoring the synthetic procedures and decreasing the number of experiments for optimization. Based on the anticipated and proved behaviour of the nitro compounds of pyrazole, novel mononitropyrazole derivatives were synthetized in a new way and with high yields. Applying the polarographic method it was discovered that during N-substitution of tautomeric mononitroimidazole and mononitropyrazole substrates other byproducts were obtained besides the main products and undesired isomers. The products were identified and then a correct and more complete N-substitution scheme could be given. Following quantitatively these N-substitution processes conclusions which directly concern the mechanism of reactions were drawn.

scholarly journals The role of nitro groups in the binding of nitroaromatics to protein MOPC 315

1978 ◽  
Vol 173 (3) ◽  
pp. 713-722 ◽  
Author(s):  
P Gettins ◽  
D Givol ◽  
R A Dwek
Keyword(s):  
Hydrogen Bond ◽  
Hydrogen Bonding ◽  
High Resolution ◽  
Hydrogen Bonds ◽  
Fluorescence Quenching ◽  
Nitro Group ◽  
Protein Interactions ◽  
Chemical Shifts ◽  
Binding Constants

Two series of dinitrophenyl haptens, in which chlorine replaces one or both nitro groups, were used to investigate, by a combination of high-resolution 1H n.m.r. and fluorescence quenching, the presence of groups in the combining site of protein MOPC 315, which form hydrogen bonds to the aromatic-ring substituents of the hapten. The large differences in binding constants on successive replacement of nitro groups were shown to be due to specific hapten-substituent-protein interactions by (a) showing that there was little difference in the interaction between these haptens and 3-methylindole (a model for the residue tryptophan-93L with which the hapten stacks in protein MOPC 315), (b) proving by 1H n.m.r. that the mode of hapten binding is constant and (c) showing that the differences in Kd were consistent with the relative hydrogen-bonding capacities of chlorine and the nitro moiety. In this way it was established that each nitro group forms a hydrogen bond. Furthermore, from consideration of the 1H n.m.r. chemical shifts of several dinitrophenyl haptens and their trinitrophenyl analogues, it was shown that there is no distortion of the o-nitro group on binding to the variable fragment of protein MOPC 315.

Investigation of Correlation between Impact Sensitivities and Nitro Group Charges in Nitro Compounds

2005 ◽  
Vol 109 (18) ◽  
pp. 8978-8982 ◽  
Author(s):  
Chaoyang Zhang ◽  
Yuanjie Shu ◽  
Yigang Huang ◽  
Xiaodong Zhao ◽  
Haishan Dong
Keyword(s):  
Nitro Group ◽  
Nitro Compounds ◽  
Impact Sensitivities
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