Covalently attached ruthenium-popypyridyl complexes on aminated reduced graphene oxide for enhancing stable photocatalysis Roberto González Gómez 1 , Seán Hennessey 1 , Christopher S. Burke 2 , Tia E. Keyes 2 , Pau Farràs 1 1 University of Galway, Ireland, 2 Dublin City University, Ireland Ruthenium-polypyridyl complexes have been widely used for the synthesis of photoactive catalysts and materials due to their well-understood photophysical properties, mainly Ru(bpy) 3 2+ (bpy: 2,2’-bipyridine), as well as Ru(tpy) 2 2+ (tpy: 2,2’;6’,2“-terpyridine) complexes. [1] Although both have appropriate excited state redox potential and sufficiently long-lived excited state to facilitate excited state electron transfer reactions, their stability needs to be improved. [2] Recent studies towards finding more promising ruthenium ligands have shown that the derivatives of the metal complexes of Ru(dqp) 2 2+ (dqp: 2,6-di(quinolin-8-yl)-pyridine) hold promising properties, such as an excited-state lifetime in the μs time-scale, as well as comparable extinction coefficients and absorption profile in the visible region to Ru(bpy) 3 2+ and Ru(tpy) 2 2+ complexes. The dqp ligand also provides a larger bite angle, resulting in an increase in the emission lifetime. [3,4] In the last decade, the scientific community has tried to boost the performance of these photoactive molecules by using graphene-based supports, [5] however, the efficient anchoring of ruthenium-polypyridyl complexes on the graphene surface is still a challenge. Herein, modified reduced graphene oxide is designed as a promising candidate to anchor photoactive molecules to enhance the photocatalytic efficiency and stability. [6] In this study, we present a strategy for effectively anchoring ruthenium-polypyridyl onto aminated reduced graphene oxide, namely Ru(tpy) 2 2+ and Ru(dqp) 2 2+ complexes; the photocatalytic activity evaluation will be also presented against model photocatalytic reactions. References 1. A. Kuznetsova, V. Matveevskaya, D. Pavlov, A. Yakunenkov, A. Potapov, Materials (Basel). 2020, 13, 2699. 2. T. Toyao, M. Saito, S. Dohshi, K. Mochizuki, M. Iwata, H. Higashimura, Y. Horiuchi, M. Matsuoka, Chem. Commun. 2014, 50, 6779. 3. M. Majuran, G. Armendariz-Vidales, S. Carrara, M. A. Haghighatbin, L. Spiccia, P. J. Barnard, G. B. Deacon, C. F. Hogan, K. L. Tuck, ChemPlusChem. 2020, 85, 346–352. 4. S. Hennessey, C. S. Burke, R. González‐Gómez, D. Sensharma, W. Tong, A. C. Kathalikkattil, F. Cucinotta, W. Schmitt, T. E. Keyes, P. Farràs. , ChemPhotoChem. 2022,6(5), e202100299. 5. J. Huang, D. Wang, Z. Yue, X. Li, D. Chu, P. Yang, The Journal of Physical Chemistry C. 2015, 119(50), 27892-27899. 6. X. Li, Z. Hao, F. Zhang, H. Li, ACS Applied Materials & Interfaces.2016, 8(19), 12141-12148.
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