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Synthesis, characterisation and self-assembly behaviour of emissive surfactant–ruthenium(II) complexes


To develop metallosurfactant based fluorescent aggregates, it is important to understand the impact of head and tail parts on the self-assembly behaviour. Here, a new series of water soluble, emissive double chain surfactant–ruthenium(II) complexes differing in their head group size and chain length, [Ru(bpy)2(DA)2]Cl2 (1), [Ru(bpy)2(HA)2]Cl2 (2), [Ru(phen)2(DA)2]Cl2 (3), [Ru(phen)2(HA)2]Cl2 (4), where bpy = 2,2’–bipyridyl, phen = 1,10–phenanthroline, DA = dodecylamine and HA = hexadecylamine, have been synthesized and characterized. For complexes 1–4, hydrophobicity behaviour, critical aggregation concentration (CAC), thermodynamics of aggregation (ΔGºa, ΔHºa and ΔSºa), and average size distribution, morphology and stability of aggregates, have been evaluated. The obtained results have shown that the increase of chain length as well as size of the aromatic head group decreases the CAC values in the order of complexes 1 > 2 > 3 > 4, whereas those changes increase the hydrophobicity and average size distribution in vice versa. The thermodynamics of aggregation indicated that the process is kinetically controlled, spontaneous, exothermic and entropy driven. The self-assembled surfactant−ruthenium(II) complexes were preferably spherical like in shape and, belonging to the vesicles family with green emissive, monodisperse, narrow size distribution and excellent stability in aqueous medium. The enlargement of vesicle’s size was noted upon increasing the head size as well as chain length, but former influenced to the greater extent. This kind of fluorescent metallovesicles can be used for biomedical and material applications in near future.

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Publication details

The article was received on 01 Aug 2017, accepted on 10 Oct 2017 and first published on 11 Oct 2017

Article type: Paper
DOI: 10.1039/C7NJ02698F
Citation: New J. Chem., 2017, Accepted Manuscript
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    Synthesis, characterisation and self-assembly behaviour of emissive surfactant–ruthenium(II) complexes

    S. Nehru, S. Veeralakshmi and S. Arunachalam, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ02698F

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