We began by monitoring a mixture of Fe II (acac)2(EtOH)2 and 10 equiv PhSH in ethanol-d6 by 1 H NMR spectroscopy. We observed no evidence of thiol binding, potentially due to competition with EtOH. Accordingly, we monitored the reaction in 95:5 toluene-d8 : ethanol-d6. At low temperatures, we observed peak broadening and a shoulder peak by 1 H NMR spectroscopy, indicating a change in speciation of Fe II (acac)2(EtOH)2. Though the broad peaks do not elucidate the structure, this observation is consistent with weak PhSH binding to iron(II), which leads to an equilibrium mixture containing some amount of thiol complex.