Synthesis, characterization, structural and photophysical properties of heteroleptic ruthenium complexes containing 2-(1H-benzo[d]imidazol-2-yl)quinoline ligand towards electrocatalytic CO2 reduction

Springer 2022

Two novel mononuclear heteroleptic Ru(II) photosensitizers with 2-(1H-benzo[d]imidazol-2-yl)quinoline derivatives were designed and successfully synthesized. The facile synthesis and their photophysical properties are investigated. Both the Ru(II) complexes i.e., [RuII(bpy)2(L1)](ClO4) : [1](ClO4) and [RuII(bpy)2(L2)](ClO4)2 : [2](ClO4)2 {L1 = 2-(1H-benzo[d]imidazol-2-yl)quinoline and L2 = 2-(1-methyl-1H-benzo[d]imidazol-2-yl)quinoline} have been meticulously characterized by different spectroscopic and analytical techniques such as FT–IR, 1H NMR, ESI mass spectra, UV–vis and fluorescence spectroscopy, etc. Molecular structures of [1](ClO4) and [2](ClO4)2 have been determined by a single-crystal X-ray structure diffraction study. Redox and spectral properties of the synthesized Ru(II) complexes were examined along with their corresponding ligands and compared with the classic homoleptic [RuII(bpy)3](PF6)2. The effects on substituents in the ligand backbone were scrutinised. The emission behaviour of both [1](ClO4) and [2](ClO4)2 revealed relatively long-lived emissive 3MLCT and bathochromic shift (~ 715 nm) while compared with [RuII(bpy)3](PF6)2 (~ 605 nm). Fairly weak quantum yields for [1](ClO4) and [2](ClO4)2 : ∼ 0.00299 and ∼ 0.00295 with half-lives 181.57 ns and 198.89 ns, respectively, suggested different non-radiative emission pathways. Additionally, for [1](ClO4) and [2](ClO4)2, electrochemical reduction of carbon dioxide (CO2) in dry acetonitrile solvent was performed and showed great promises for future designing of electrochemical reduction of CO2. Graphical abstract: Two mononuclear heteroleptic Ru(II) photosensitizers [1](ClO4) and [2](ClO4)2 containing 2-(1H-benzo[d]imidazol-2-yl)quinoline ligand were synthesized and investigated via FT–IR, 1H NMR, ESI mass spectra, UV–vis, time-resolved photoluminescence spectroscopy, X-ray structure, etc. Both [1](ClO4) and [2](ClO4)2 showed great promises for electrochemical reduction of carbon dioxide in dry aceton

Physics; Chemistry; Article; PeerReviewed

INTHY oai:raiith.iith.ac.in:9761
Kumbhakar, Sadananda and Giri, Bishnubasu and Muley, Arabinda and Karumban, Kalai Selvan and Biswas, Chinmoy and Raavi, Sai Santosh Kumar and Maji, Somnath (2022) Synthesis, characterization, structural and photophysical properties of heteroleptic ruthenium complexes containing 2-(1H-benzo[d]imidazol-2-yl)quinoline ligand towards electrocatalytic CO2 reduction. Journal of Chemical Sciences, 134 (3). ISSN 0973-7103
1345035133

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