Water-induced red luminescence in ionic square-planar cyclometalated platinum(II) complexes

A new series of cyclometalated Pt(II) complexes 1–4 soluble in water was synthesized and characterized. Thanks to d8-d8 metal-metal and/or π-π interactions, these complexes are able to self-assembly in aqueous solutions, showing a remarkable color change and luminescence enhancement compared to the...

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Bibliographic Details
Published in:Inorganica Chimica Acta 2017-04, Vol.460, p.165-170
Main Authors: Ionescu, Andreea, Ricciardi, Loredana
Format: Article
Language:English
Subjects:
Aeration
Aggregates
Aggregation
Aqueous solutions
Enhanced luminescence
Hydrophobic surfaces
Hydrophobicity
Luminescence
Molecular chains
Oxygen
Photophysics
Platinum
Pt(II) complexes
Temperature
Water solubility
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Summary:A new series of cyclometalated Pt(II) complexes 1–4 soluble in water was synthesized and characterized. Thanks to d8-d8 metal-metal and/or π-π interactions, these complexes are able to self-assembly in aqueous solutions, showing a remarkable color change and luminescence enhancement compared to the single molecule. Interestingly, aggregates luminescence is not quenched by molecular oxygen. [Display omitted] •A new series of water soluble cyclometalated Pt(II) complexes has been synthesized.•An appreciable color change on going from DMSO to water solution was observed.•All compounds in water show a red-NIR luminescence arising from self-assembly.•The broad structureless emission bands were assigned to a MMLCT transition.•Aggregates luminescence is not quenched by molecular oxygen. This work describes the synthesis and characterization of a series of water soluble Pt(II) complexes, with different degree of hydrophobicity, and thanks to d8-d8 metal-metal and/or π-π interactions, these complexes are able to aggregate in aqueous solutions. Aggregates are luminescent more efficiently than the single molecule, exhibiting one of the highest emission quantum yield reported up to date for Pt(II) complexes dissolved in aerated water solution at room temperature (1·10−5M). Moreover, differently from single molecule, aggregates luminescence is not quenched by molecular oxygen.
ISSN:0020-1693
1873-3255
DOI:10.1016/j.ica.2016.07.040