Harnessing Proton-Coupled Electron Transfer for Hydrogenation of Aza-Arenes: Photochemistry of Quinoxaline Derivatives in Methanol
Olaf W. Morawski,
Paweł Gawryś,
Andrzej L. Sobolewski
Abstract:Three quinoxaline derivatives are investigated both experimentally
and theoretically to assess their ability for the methanol oxidation
and harvesting of hydrogen. In inert solvents, the nonplanar compounds
exhibit very weak fluorescence from the lowest excited singlet state,
whereas the planar and rigid chromophore emits non-Kasha fluorescence
from the S2(ππ*) state despite the proximity
of the S1(nπ*) state. In methanol, hydrogen-bonded
complexes with solvent molecules are formed, and in all chromophores,
th… Show more
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