title: Demonstration of intramolecular energy transfer in asymmetric bimetallic ruthenium(ii) complexes.
abstract: A new family of bimetallic Ru(ii) complexes derived from an asymmetric bridging ligand (tpy-Hbzim-dipy) consisting of both bipyridine and terpyridine chelating sites covalently connected via phenyl-imidazole spacer were designed in this work to demonstrate intramolecular energy transfer from one component to the other in asymmetric dyads. To fine tune the photo-redox properties, both bidentate and tridentate terminal ligands in the complexes were varied systematically. Both steady state and time-resolved luminescence spectral results indicated photo-induced intramolecular energy transfer from the excited MLCT state of the [(bpy/phen)2RuII(dipy-Hbzim-tpy)] component to the MLCT state of the tpy-containing unit [(dipy-Hbzim-tpy)RuII(tpy-PhCH3/H2pbbzim)] in dyads with rate constant values on the order of 106-107s-1. Temperature-dependent luminescence studies indicated an enhancement in the luminescence intensity and excited state lifetimes upon decreasing the temperature.
authors.affiliation: Department of Chemistry, Inorganic Chemistry Section, Jadavpur University, Kolkata 700032, India. sbaitalik@hotmail.com sujoyb@chemistry.jdvu.ac.in.
authors.forename: Manoranjan
authors.initials: M
authors.lastname: Bar
authors.affiliation: Department of Chemistry, Inorganic Chemistry Section, Jadavpur University, Kolkata 700032, India. sbaitalik@hotmail.com sujoyb@chemistry.jdvu.ac.in.
authors.forename: Dinesh
authors.initials: D
authors.lastname: Maity
authors.affiliation: Department of Chemistry, Inorganic Chemistry Section, Jadavpur University, Kolkata 700032, India. sbaitalik@hotmail.com sujoyb@chemistry.jdvu.ac.in.
authors.forename: Shyamal
authors.initials: S
authors.lastname: Das
authors.affiliation: Department of Chemistry, Inorganic Chemistry Section, Jadavpur University, Kolkata 700032, India. sbaitalik@hotmail.com sujoyb@chemistry.jdvu.ac.in.
authors.forename: Sujoy
authors.initials: S
authors.lastname: Baitalik