Sima Saeedi, C. Xue, Bradley J. McCullough
Jan 4, 2019
Citations
1
Influential Citations
13
Citations
Journal
ACS Applied Energy Materials
Abstract
In an effort to further develop earth-abundant photosensitizers for use in solar fuels production, a series of heteroleptic, visible-light-absorbing Cu(I) photosensitizers (PSs) of the design [Cu(PP)(NN)]PF6 were prepared (PP = bidentate diphosphine, Xantphos = 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene, DPEphos = bis[(2-diphenylphosphino)phenyl]ether, Nixantphos = 4,6-bis(diphenylphosphino)-10H-phenoxazine; NN = bidentate diimine, biq = 2,2′-biquinoline). The Xantphos ligand was modified to impart flexibility (PP = DPEphos) and redox activity (PP = Nixantphos) to the diphosphine backbone to probe their influence on the light-absorbing properties and excited state dynamics using steady-state and time-resolved (nanosecond) spectroscopic techniques. Following visible light excitation to populate redox-active Cu(dπ) → biq(π*) metal-to-ligand charge transfer excited states (MLCT ES), intermolecular electron transfer via reductive quenching by the N,N-dimethylaniline (DMA) electron donor produces the one-...