Abstract
For the first time, we unearthed the aggregation induced emission enhancement of well-known ruthenium(II) complex attached with bathophenanthroline ligand, Ru(dpphen)32+ (dpphen = 4,7-diphenyl-1,10-phenanthroline). Complex Ru(dpphen)32+ displayed a weak emission at 613 nm in CH3CN while exciting at its MLCT band (464 nm). However, upon response with incremental addition of poor and viscous solvents into the CH3CN solution of Ru(dpphen)32+, the emission intensity drastically increased due to the formation of nanoaggregates. Restricted intramolecular rotation (RIR) of peripheral phenyl rings attached to the bathophenanthroline ligands in Ru(dpphen)32+ complex is responsible for this unique phenomenon, thereby stimulates the emission intensity. The formation of these nanoaggregates was confirmed by TEM studies.
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