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- Title
pH-Responsive Emission of Novel Water-Soluble Polymeric Iridium(III) Complexes.
- Authors
Tsakaraki, Dafnianna; Andreopoulou, Aikaterini K.; Bokias, Georgios
- Abstract
The synthesis and characterization of water-soluble copolymers containing N,N-dimethylacrylamide (DMAM) and a vinylic monomer containing an Iridium(III), Ir(III), complex substituted with the quinoline-based unit 2-(pyridin-2-ylo)-6-styrene-4-phenylquinoline (VQPy) as ligand are reported. These copolymers were prepared through pre- or post-polymerization complexation of Ir(III) with the VQPy units. The first methodology led to copolymer P1 having fully complexed VQPy units, whereas the latter methodology allowed the preparation of terpolymers containing free and Ir(III)-complexed VQPy units (copolymer P2). The optical properties of the copolymers were studied in detail through UV-Vis and photoluminescence spectroscopy in aqueous solution. It is shown that the metal-to-ligand charge transfer (ΜLCT) emission is prevailing in the case of P1, regardless of pH. In contrast, in the case of terpolymer P2 the MLCT emission of the Ir(III) complex is combined with the pH-responsive emission of free VQPy units, leading to characteristic pH-responsive color changes under UV illumination in the acidic pH region.
- Subjects
IRIDIUM; QUINOLINE; POLYMERIZATION; CHARGE transfer; OPTICAL properties; COPOLYMERS; ULTRAVIOLET-visible spectroscopy; COPOLYMERIZATION
- Publication
Nanomaterials (2079-4991), 2022, Vol 12, Issue 6, p927
- ISSN
2079-4991
- Publication type
Article
- DOI
10.3390/nano12060927