Photophysical and photochemical properties of a family of isoelectronic tris chelated ruthenium(ii) aza-/azo-aromatic complexes
- Creators
- Das, Samir
- Pradhan, Basudev
Abstract
We have investigated the electrochemical, spectroscopic and electroluminescent properties of a family of aza-aromatic complexes of ruthenium of type [Ru^(II)(bpy/phen)_2(L)]^(2+) (4d^6) with three isomeric L ligands, where, bpy = 2,2′-bipyridine, phen = 1,10-phenanthroline and the L ligands are 3-(2-pyridyl)[1,2,4]triazolo[1,5-a]pyridine (L^1), 3-(2-pyridyl[1,2,3])triazolo[1,5-a]pyridine (L^2) and 2-(2-pyridyl)[1,2,4]triazolo[1,5-a]pyridine (L^3). The complexes display two bands in the visible region near 410–420 and 440–450 nm. The complexes are diamagnetic and show well defined ^1H NMR lines. They are electroactive in acetonitrile solution and exhibit a well defined Ru^(II)/Ru^(III) couple near 1.20 to 1.30 V and −1.40 to −1.50 V due to ligand reduction versus Saturated Calomel Electrode (SCE). The solutions are also luminescent, with peaks are near 600 nm. All the complexes are electroluminescent in nature with peaks lying near 580 nm. L^1 and L^3 ligated complexes with two bpy co-ligands show weak photoluminescence (PL) but stronger electroluminescence (EL) compared to corresponding L^2 ligated analogues.
Additional Information
© 2015 The Royal Society of Chemistry. Received 18th June 2015; Accepted 25th August 2015; First published online 25 August 2015. The authors thankfully acknowledge the laboratory support provided by Prof. A. Chakravorty, and Prof. A. J. Pal of Indian Association for the Cultivation of Science, Kolkata, India. The authors also thank Dr Priyabrata Banerjee for his advice and suggestions regarding chemical synthesis. The authors acknowledge Dr Arundhati Nag for helping us in compiling the manuscript. This work is partially supported by the Department of Science and Technology (Project No. -SB/FTP/PS-148/2013, and SR/S2/RJN-55/2012) and Council of Scientific and Industrial Research, India.Attached Files
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Additional details
- Eprint ID
- 60125
- Resolver ID
- CaltechAUTHORS:20150909-111424370
- SB/FTP/PS-148/2013
- Department of Science and Technology (India)
- SR/S2/RJN-55/2012
- Department of Science and Technology (India)
- Council of Scientific and Industrial Research (India)
- Created
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2015-09-09Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field