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Issue 43, 2016
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Demonstration of intramolecular energy transfer in asymmetric bimetallic ruthenium(II) complexes

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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 106–107 s−1. Temperature-dependent luminescence studies indicated an enhancement in the luminescence intensity and excited state lifetimes upon decreasing the temperature.

Graphical abstract: Demonstration of intramolecular energy transfer in asymmetric bimetallic ruthenium(ii) complexes

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Publication details

The article was received on 17 Aug 2016, accepted on 21 Sep 2016 and first published on 21 Sep 2016


Article type: Paper
DOI: 10.1039/C6DT03250H
Citation: Dalton Trans., 2016,45, 17241-17253
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    Demonstration of intramolecular energy transfer in asymmetric bimetallic ruthenium(II) complexes

    M. Bar, D. Maity, S. Das and S. Baitalik, Dalton Trans., 2016, 45, 17241
    DOI: 10.1039/C6DT03250H

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