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. 2018 Jan 5;3(2):400–409. doi: 10.1021/acsenergylett.7b01123

Figure 3.

Figure 3

(a) Photocatalytic H2 evolution with N2-COF and Co-1, (b) H2 evolution rates with the Nx-COFs and with COF-42 photosensitizers using Co-1 cocatalyst and TEOA donor, and (c) spectrophotometrically monitoring the reduced CoII state and subsequent formation of the CoI and/or H–CoIII state using COF-42 and Co-1 cocatalyst. (d) The paramagnetic CoII state formed during photocatalysis can be observed in the X-band EPR spectrum. (e) The CoIII–H and/or the CoII–H species are shown to produce H2 by a heterolytic pathway involving a single cobalt center in the reaction involving N2-COF and Co-1 cocatalyst. Reprinted from ref (60). Copyright 2017 American Chemical Society.