Abstract
The emission intensity and emissive lifetimes of *Ru(4,7-(SO 3C 6H 5) 2-phen) 3 poststaggered4− in solutions containing various cationic starburst dendrimers (SBD) in the presence and absence of potential quenchers were investigated. The binding constants of *Ru(4,7-(SO 3C 6H 5) 2-phen) 3 poststaggered4− to SBD were determined using changes in the probe's excited state lifetime as a function of the SBD concentration and generation. An observed increase in the probe's lifetime in the presence of SBD is attributed to a lower O 2 concentration at the dendrimer's surface than in water. The quenching constants between *Ru(4,7-(SO 3C 6H 5) 2-phen) 3 poststaggered4− and methylviologen (MV 2+) and K 4Fe(CN) 6 and K 3Fe(CN) 6 were determined by laser flash-photolysis in the presence of various generations of SBD.
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