Interaction between closed- and open-shell molecules. VII. Carbon-13 contact shift and molecular or bital studies on the charge-transfer interaction between halogenated molecules and nitroxide radical

1972 ◽  
Vol 94 (14) ◽  
pp. 4812-4818 ◽  
Author(s):  
Isao Morishima ◽  
Toshiro Inubushi ◽  
Kazunaka Endo ◽  
Teijiro Yonezawa ◽  
Kojitsu Goto
Keyword(s):  
Charge Transfer ◽  
Nitroxide Radical ◽  
Open Shell ◽  
Charge Transfer Interaction ◽  
Contact Shift

Fluorescence Quenching of Aminodiphenylamines with Chloromethanes

2002 ◽  
Vol 67 (8) ◽  
pp. 1154-1164 ◽  
Author(s):  
Nachiappan Radha ◽  
Meenakshisundaram Swaminathan
Keyword(s):  
Charge Transfer ◽  
Fluorescence Quenching ◽  
Ground State ◽  
Rate Constants ◽  
Quenching Mechanism ◽  
Quenching Rate ◽  
Charge Transfer Interaction ◽  
Electronically Excited ◽  
A Charge

The fluorescence quenching of 2-aminodiphenylamine (2ADPA), 4-aminodiphenylamine (4ADPA) and 4,4'-diaminodiphenylamine (DADPA) with tetrachloromethane, chloroform and dichloromethane have been studied in hexane, dioxane, acetonitrile and methanol as solvents. The quenching rate constants for the process have also been obtained by measuring the lifetimes of the fluorophores. The quenching was found to be dynamic in all cases. For 2ADPA and 4ADPA, the quenching rate constants of CCl4 and CHCl3 depend on the viscosity, whereas in the case of CH2Cl2, kq depends on polarity. The quenching rate constants for DADPA with CCl4 are viscosity-dependent but the quenching with CHCl3 and CH2Cl2 depends on the polarity of the solvents. From the results, the quenching mechanism is explained by the formation of a non-emissive complex involving a charge-transfer interaction between the electronically excited fluorophores and ground-state chloromethanes.

Enantioselective Nucleophilic Aromatic Substitution Reaction of Azlactones to Synthesize Quaternary α-Amino Acid Derivatives

Synlett ◽  
2020 ◽  
Author(s):  
Xiaohua Liu ◽  
Yi Li ◽  
Hao Pan ◽  
Wang-Yuren Li ◽  
Xiaoming Feng
Keyword(s):  
Hydrogen Bonding ◽  
Charge Transfer ◽  
Amino Acid ◽  
Substitution Reaction ◽  
Nucleophilic Aromatic Substitution ◽  
Amino Acid Derivatives ◽  
Amino Acid Esters ◽  
Aromatic Substitution ◽  
Charge Transfer Interaction ◽  
Acid Esters

AbstractAn asymmetric organocatalytic nucleophilic aromatic substitution reaction of azlactones with electron-deficient aryls was established. A variety of α-aryl α-alkyl α-amino acid esters and peptides were obtained in decent yields and stereoselectivities. A new bifunctional catalytic mode involving charge-transfer interaction and hydrogen bonding is proposed to explain the enantioselectivity.

scholarly journals Color-tunable arylaminoanthraquinone dyes through hydrogen-bond-assisted charge transfer interaction

RSC Advances ◽  
2021 ◽  
Vol 11 (39) ◽  
pp. 24217-24231
Author(s):  
Takashi Takeda ◽  
Yotaro Kasahara ◽  
Tomoyuki Akutagawa
Keyword(s):  
Hydrogen Bond ◽  
Charge Transfer ◽  
Charge Transfer Interaction ◽  
Color Tunable

A color-tunable anthraquinone library based on arylaminoanthraquinone was prepared through hydrogen-bond-assisted charge transfer interaction.

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