Quenching of the Fluorescence of Tris (2 2-Bipyridine) Ruthenium(II) [Ru(bipy)3]2+ by a Dimeric Copper(II) Complex.

• Main Author: Cummins, Kevin E.
• Format: Others
• Published: Digital Commons @ East Tennessee State University 2011
• Subjects: Fluorescence; Dimeric Copper(II); [Ru(bipy)3]2+; Ruthenium; Quenching; Chemistry; Inorganic Chemistry; Physical Sciences and Mathematics
• Online Access: https://dc.etsu.edu/etd/1347; https://dc.etsu.edu/cgi/viewcontent.cgi?article=2538&context=etd

The quenching of the [Ru(bipy)3]2+ by Cu2L2+ was studied and the data were plotted with the Stern-Volmer equation. The plot showed a break and was divided into 2 regions, <0.5 and >0.5 Cu2L2+: [Ru(bipy)3]2+ molar ratio. Quenching above the 0.5 Cu2L2+: [Ru(bipy)3]2+ molar ratio was slower (330 x 10-6 M-1s-1) than the quenching rate reaction below 0.5 ratio (387 x 10-6 M-1s-1). With Cu2L2+ being a dimeric complex the break and differences in the quenching reaction rates can be explained in terms of the stoichiometry. When the Cu2L2+: [Ru(bipy)3]2+ ratio is < 0.5, then each [Ru(bipy)3]2+ can interact with 1 Cu2L2+ dimer. At 0.5 then there is exactly a 1:1 ratio RuII : CuII. Above the 0.5 ratio the [Ru(bipy)3]2+ can interact with maybe only one of the Cu2L2+'s in the dimer, or with a [Ru(bipy)3]2+: Cu2L2+ unit, so the quenching is less efficient.