Fig. 3. (a) Co 2p XPS spectra of Ti3–BPDC–CoH and the fitted result indicates the Co2+ oxidation state after NaBEt3H treatment. (b) Ti 2p XPS spectra of Ti3–BPDC–CoH and the fitted result indicates the Ti4+ oxidation state after NaBEt3H treatment. (c) Co pre-edge XANES features of Ti3–BPDC–CoCl (navy) and Ti3–BPDC–CoH (violet) in comparison to that of CoCl2 (black). (d) Ti pre-edge XANES features of Ti3–BPDC–CoCl (navy) and Ti3–BPDC–CoH (violet).
