title: Fluorescence quenching N,N-bis(2,6-dimethylphenyl)-3,4:9,10-perylenetetracarboxylic diimide (BDPD) laser dye by colloidal silver nanoparticles.
abstract: The fluorescence quenching N,N-bis(2,6-dimethylphenyl)-3,4:9,10-perylenetetra-carboxylic diimide (BDPD) by colloidal silver nanoparticles (AgNPs) was studied in methanol and ethylene glycol by steady state fluorescence measurements. The Stern-Volmer quenching rate constant (Ksv) was calculated as 8.1 × 10(8) and 8.22 × 10(8) M(-1) in methanol and ethylene glycol respectively. Taking the fluorescence lifetime of BDPD in the absence of silver nanoparticles as 3.2 ns, the values of the fluorescence quenching rate constants (kq = Ksv/τ) are calculated as 2.54 × 10(17) and 2.56 × 10(17) M(-1) s(-1) in methanol and ethylene glycol respectively. From the data, fluorescence resonance energy transfer and / or electron transfer processes play a major role in the fluorescence quenching of BDPD by AgNPs in methanol and low concentrations of Ag NPs in ethylene glycol. The static quenching rate constant in ethylene glycol was calculated by modified Stern-Volmer equation as V = 8.86 × 10(9) M(-1). For dynamic quenching, the radius of quenching sphere volume r values were found to be 68.3 and 70.6 nm in ethanol and ethylene glycol, respectively. For static quenching in ethylene glycol the effective radius of quenching sphere action (kinetic radius) was calculated as r = 152 nm.
authors: Chemistry Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah, 21589, Saudi Arabia, samyeldaly@yahoo.com.
authors: Samy A
authors: SA
authors: El-Daly
authors: Ibrahim A
authors: IA
authors: Salem
authors: Mahmoud A
authors: MA
authors: Hussein
authors: Abdullah M
authors: AM
authors: Asiri
references: J Fluoresc. 2005 Sep;15(5):777-84
references: 16341797
references: J Phys Chem B. 2005 Apr 28;109(16):7643-8
references: 16851886
references: Acc Chem Res. 2003 Dec;36(12):888-98
references: 14674780
references: J Am Chem Soc. 2007 Feb 21;129(7):1862-3
references: 17256938
references: J Fluoresc. 2004 Jul;14(4):355-67
references: 15617378
references: Chem Rev. 1997 Oct 1;97(6):1793-1896
references: 11848893
references: Org Lett. 2009 Mar 19;11(6):1385-7
references: 19245243
references: Org Lett. 2009 Jul 16;11(14):3084-7
references: 19586064
references: J Phys Chem B. 2005 Apr 28;109(16):7969-75
references: 16851931