Cioncoloni, G., Senn, H. M. , Sproules, S. , Wilson, C. and Symes, M. (2016) The electronic and solvatochromic properties of [Co(L)(bipyridine)2]+ (L = o-catecholato, o-benzenedithiolato) species: a combined experimental and computational study. Dalton Transactions, 45(39), pp. 15575-15585. (doi: 10.1039/C6DT02807A)
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Abstract
Complexes of Co(III) containing mixed chelating diimine and o-quinone ligand sets are of fundamental interest on account of their fascinating magnetic and electronic properties. Whilst complexes of this type containing one diimine and two o-quinone ligands have been studied extensively, those with the reverse stoichiometry (two diimines and one o-quinone) are much rarer. Herein, we describe a ready route to the synthesis of the complex [CoIII(o-catecholate) (2,2′-bipyridine)2]+ (1), and also report the synthesis of [CoIII(o-catecholate)(5,5′-dimethyl-2,2′-bipyridine)2]+ (2) and [CoIII(o-benezenedithiolate)(5,5′-dimethyl-2,2′-bipyridine)2]+ (3) for the first time. Spectroscopic studies show that complex 2 displays intriguing solvatochromic behaviour as a function of solvent hydrogen bond donation ability, a property of this type of complex which has hitherto not been reported. Time-dependent density function theory (TD-DFT) shows that this effect arises as a result of hydrogen bonding between the solvent and the oxygen atoms of the catecholate ligand. In contrast, the sulfur atoms in the benzenedithiolate analogue 3 are much weaker acceptors of hydrogen bonds from the solvent, meaning that complex 3 is only very weakly solvatochromic. Finally, we show that complex 2 has some potential as a molecular probe that can report on the composition of mixed solvent systems as a function of its absorbance spectrum.
Item Type: | Articles |
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Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Sproules, Dr Stephen and Cioncoloni, Giacomo and Wilson, Dr Claire and Senn, Dr Hans and Symes, Professor Mark |
Authors: | Cioncoloni, G., Senn, H. M., Sproules, S., Wilson, C., and Symes, M. |
College/School: | College of Science and Engineering > School of Chemistry |
Journal Name: | Dalton Transactions |
Publisher: | Royal Society of Chemistry |
ISSN: | 1477-9226 |
ISSN (Online): | 1477-9234 |
Published Online: | 08 September 2016 |
Copyright Holders: | Copyright © 2016 Royal Society of Chemistry |
First Published: | First published in Dalton Transactions 45(39):15575-15585 |
Publisher Policy: | Reproduced under a Creative Commons License |
Data DOI: | 10.5525/gla.researchdata.350 |
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