Proton-coupled electron-transfer (PCET) events are important in the coupling of photoredox reactions to catalytic processes. The Ru(II) complexes prepared have carefully tuned absorption/redox/acid-base characteristics that can be traced spectroscopically, making them ideally suited for UV-vis transient absorption analysis. In this work excited state PCET processes were investigated using [Ru(bpy)2(4bpyOH)]2+ (bpy = 2,2’-bipyridine; 4bpyOH = 4-hydroxy-2,2’-bipyridine, [Ru(II)OH]2+) and [Ru(bpy)2(4bpyOMe)]2+ (4bpyOMe = 4-methoxy-2,2’-bipyridine, [Ru(II)OMe]2+) as chromophores and AQ (anthraquinone) as an acceptor. The ground and excited state structural, electronic and spectroscopic properties of each complex were investigated. The photoproducts suggest a concerted PCET process to AQ from [Ru(II)OH]2+ on the nanosecond timescale.

Excited state proton-coupled electron-transfer events in asymmetric ruthenium polypyridyl complexes

ACS Spring Meeting 2021

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