Abstract
A sparsely substituted chlorin macrocycle containing a Co(II) center (1-Co) has been synthesized and structurally characterized. The Co(II) atom resides in a square planar coordination environment and induces significant out-of-plane distortion of the chlorin macrocycle. The paramagnetic Co(II) center resides in the macrocycle in a S = 1/2 spin state, which displays an axial doublet signal (g⊥ ≈ 2.3 and g∥ ≈ 2.03) in the X-band EPR spectrum. The open-shell d-orbital configuration is manifest in the transient absorption spectrum, which reveals an excited-state lifetime of 8.6 ± 0.2 ps for 1-Co. The Co(II) chlorin exhibits a rich oxidation–reduction chemistry with five reversible one-electron waves (three oxidative processes and two reductive processes) observed in the cyclic voltammogram. The reduction processes of 1-Co drive hydrogen evolution catalysis. Electrochemical kinetics analysis of HER by 1-Co in trifluoroacetic acid reveals a hydrogen evolution mechanism that proceeds by an ECEC mechanism. Bench...
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