Table 1 Best fit ⁵⁷Fe Mössbauer parameters obtained from the 295 ± 5 K spectra shown in Fig. 4.

Sample	δ (mm/s)	ΔE_q (mm/s)	w3 (mm/s)	S (%)	Ion species	Coordination
FeS 3.5 mM L-cysteine	0.20	0.58	0.18	17.2	Fe³⁺	[2Fe-2S]²⁺
	0.35	1.01	0.17	9.0	Fe³⁺	[4Fe-4S]²⁺
	0.59	3.33	0.14	21.1	Fe²⁺	Mononuclear, 4 co-ord
	0.60	3.02^a	0.17	26.4	Fe²⁺	[2Fe-2S]⁰
	1.02	2.97	0.29	26.3	Fe²⁺	5 or 6 co-ord
FeS 5 mM L-cysteine	0.25	0.67	0.23	15.1	Fe³⁺	[2Fe-2S]²⁺
	0.37	0.93	0.19	18.3	Fe³⁺	[4Fe-4S]²⁺
	0.58	3.32	0.15	25.7	Fe²⁺	Mononuclear, 4 co-ord
	0.60	3.01	0.17	31.4	Fe²⁺	[2Fe-2S]⁰
	1.08	2.70	0.23	9.4	Fe²⁺	5 or 6 co-ord
FeS 10 mM L-cysteine	0.16	0.57	0.23	9.8	Fe³⁺	[2Fe-2S]²⁺
	0.58	3.33	0.17	49.5	Fe²⁺	Mononuclear, 4 co-ord
	0.60	3.02	0.17	40.7	Fe²⁺	[2Fe-2S]⁰

The best fits were obtained using Lorentzian shaped doublets, and fit using a least-squares method in the Recoil fitting programme.
^aIndicates fixed parameter during fitting.

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