Luminescent Electropolymerizable Ruthenium Complexes and Corresponding Conducting Metallopolymers

Published on 2018-10-11T10:13:23Z (GMT) by
Tris­(2,2′-bipyridyl)­ruthenium­(II) dichloride [Ru­(bpy)<sub>3</sub>Cl<sub>2</sub>] and analogous complexes have been studied extensively in the literature due to their luminescent and photochemical properties as well as their excited-state lifetimes. Conducting polymers with similar ruthenium groups have also been investigated for various applications. In this study, syntheses of four ruthenium complexes with a polymerizable tridentate ligand, bis­[4-[2-(3,4-diethylenedioxy)­thiophene]­pyrazol-1-yl]­pyridine (EDOT<sub>2</sub>NNN), and with bidentate ligands, two of which were anionic (hfac: 1,1,1,5,5,5-hexafluoro-2,4-pentanedione; dbm: dibenzoylmethane) and two of which were neutral (bpy: 2,2′-bipyridyl; phen: 1,10-phenanthroline), were achieved for potential OLED/PLED applications. Saturated CH<sub>2</sub>Cl<sub>2</sub> solutions of monomers were oxidatively and electrochemically polymerized, and the scan rate dependences of the polymers were measured. UV–vis spectroscopic characterizations of the complexes and the EDOT-functionalized ligand were obtained. [Ru­(EDOT<sub>2</sub>NNN)­(phen)­(Cl)]­(PF<sub>6</sub>) was electropolymerized on an ITO (indium tin oxide)-coated glass surface to obtain the solid-state absorption spectrum of the corresponding polymer. Photophysical data for each complex, i.e., excitation and emission spectra at 77 K and RT, in EtOH/MeOH (4:1) and in 2-MeTHF (dry, air-free, and aerated), quantum yield, and luminescence lifetime have been measured. The radiative and nonradiative decay constants as well as the oxygen quenching rate coefficient for each complex were calculated. [Ru­(EDOT<sub>2</sub>NNN)­(phen)­(Cl)]­(PF<sub>6</sub>), having the highest quantum yield of phosphorescence and the longest lifetime, was electropolymerized on an ITO-coated glass surface to obtain the solid-state excitation and emission spectra of the corresponding polymer. Luminescence studies of the polymer had promising results for photoluminescence.

Cite this collection

Keskin, Seyma Goren; Zhu, Xunjin; Yang, Xiaoping; Cowley, Alan H.; Holliday, Bradley J. (2018): Luminescent Electropolymerizable Ruthenium Complexes

and Corresponding Conducting Metallopolymers. ACS Publications. Collection.