Title: Fluorescence Quenching of Aminodiphenylamines with Chloromethanes
Abstract: 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 CCl 4 and CHCl 3 depend on the viscosity, whereas in the case of CH 2 Cl 2 , k q depends on polarity. The quenching rate constants for DADPA with CCl 4 are viscosity-dependent but the quenching with CHCl 3 and CH 2 Cl 2 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.
Publication Year: 2002
Publication Date: 2002-01-01
Language: en
Type: article
Indexed In: ['crossref']
Access and Citation
Cited By Count: 2
AI Researcher Chatbot
Get quick answers to your questions about the article from our AI researcher chatbot