Table 1. Room temperature ⁵⁷Fe Mössbauer parameters obtained by fitting the spectra in ESI, Fig. S8.

Samples	Isomer shift (mm s–1)	Quadrupole splitting (mm s–1)	Relative component area (%)
Fe[DOPA]3 (pH = 9)	0.40	0.89	78
	0.13	0.55	22
Water saturated Fe[DOPA]3 (pH = 9)	0.37	0.87	100
Fe[DOPA]2 (pH = 7)	0.43	0.78	100
Water saturated Fe[DOPA]2 (pH = 7)	0.43	0.78	100
Fe[DOPA] (pH = 4)	0.41	0.81	91
	1.29	2.93	9
Water saturated Fe[DOPA] (pH = 4)	0.40	0.82	100