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Fig. 2. Plot of the isomer shifts versus Fe oxidation state for the following low-spin iron complexes with cyclam-related ligands: trans-(cyclam)Fe(N3)2 (20), (cy-ac)FeN3 (21), trans-[(cyclam)Fe(N3)2]+ (20), [(cy-ac)FeX]+ with X = N3, Cl, OTf (CF3SO3), and F (21, 30), low-spin [(Me3cy-ac)FeN3]+ (29), [trans-(cyclam)FeN3]2N (20), [(cy-ac)Fe]2N (21), [(Me4cyclam)FeO]2+ (43), [(cy-ac)FeO]+ (21), [(TMCS)FeO]+ (TMCS = 1-mercaptoethyl-4,8,11-trimethyl-1,4,8,11-tetraazacyclotetradecane) (36), [(Me3cy-ac) FeN3]2+ (29), [trans-(cyclam)FeN(N3)]+ (20), [(cy-ac)FeN]+ (21), and 5. Plot of the isomer shifts versus Fe oxidation state for the following low-spin iron complexes with cyclam-related ligands: trans-(cyclam)Fe(N3)2 (20), (cy-ac)FeN3 (21), trans-[(cyclam)Fe(N3)2]+ (20), [(cy-ac)FeX]+ with X = N3, Cl, OTf (CF3SO3), and F (21, 30), low-spin [(Me3cy-ac)FeN3]+ (29), [trans-(cyclam)FeN3]2N (20), [(cy-ac)Fe]2N (21), [(Me4cyclam)FeO]2+ (43), [(cy-ac)FeO]+ (21), [(TMCS)FeO]+ (TMCS = 1-mercaptoethyl-4,8,11-trimethyl-1,4,8,11-tetraazacyclotetradecane) (36), [(Me3cy-ac) FeN3]2+ (29), [trans-(cyclam)FeN(N3)]+ (20), [(cy-ac)FeN]+ (21), and 5. A plot of the Fe x-ray absorption spectroscopy (XAS) pre-edge peak energies of Fe(III), Fe(IV), Fe(V), and Fe(VI) complexes versus Fe oxidation state is also shown (white squares). The dashed and dotted lines represent least-squares fits [the Fe(IV) complex [(cy-ac)FeO]OTf is excluded in the former]. John F. Berry et al. Science 2006;312: American Association for the Advancement of Science
![Fig. 2. Plot of the isomer shifts versus Fe oxidation state for the following low-spin iron complexes with cyclam-related ligands: trans-(cyclam)Fe(N3)2 (20), (cy-ac)FeN3 (21), trans-[(cyclam)Fe(N3)2]+ (20), [(cy-ac)FeX]+ with X = N3, Cl, OTf (CF3SO3), and F (21, 30), low-spin [(Me3cy-ac)FeN3]+ (29), [trans-(cyclam)FeN3]2N (20), [(cy-ac)Fe]2N (21), [(Me4cyclam)FeO]2+ (43), [(cy-ac)FeO]+ (21), [(TMCS)FeO]+ (TMCS = 1-mercaptoethyl-4,8,11-trimethyl-1,4,8,11-tetraazacyclotetradecane) (36), [(Me3cy-ac) FeN3]2+ (29), [trans-(cyclam)FeN(N3)]+ (20), [(cy-ac)FeN]+ (21), and 5.](http://slideplayer.com/slide/17256887/100/images/1/Fig.+2.+Plot+of+the+isomer+shifts+versus+Fe+oxidation+state+for+the+following+low-spin+iron+complexes+with+cyclam-related+ligands%3A+trans-%28cyclam%29Fe%28N3%292+%2820%29%2C+%28cy-ac%29FeN3+%2821%29%2C+trans-%5B%28cyclam%29Fe%28N3%292%5D%2B+%2820%29%2C+%5B%28cy-ac%29FeX%5D%2B+with+X+%3D+N3%2C+Cl%2C+OTf+%28CF3SO3%29%2C+and+F+%2821%2C+30%29%2C+low-spin+%5B%28Me3cy-ac%29FeN3%5D%2B+%2829%29%2C+%5Btrans-%28cyclam%29FeN3%5D2N+%2820%29%2C+%5B%28cy-ac%29Fe%5D2N+%2821%29%2C+%5B%28Me4cyclam%29FeO%5D2%2B+%2843%29%2C+%5B%28cy-ac%29FeO%5D%2B+%2821%29%2C+%5B%28TMCS%29FeO%5D%2B+%28TMCS+%3D+1-mercaptoethyl-4%2C8%2C11-trimethyl-1%2C4%2C8%2C11-tetraazacyclotetradecane%29+%2836%29%2C+%5B%28Me3cy-ac%29+FeN3%5D2%2B+%2829%29%2C+%5Btrans-%28cyclam%29FeN%28N3%29%5D%2B+%2820%29%2C+%5B%28cy-ac%29FeN%5D%2B+%2821%29%2C+and+5..jpg "Plot of the isomer shifts versus Fe oxidation state for the following low-spin iron complexes with cyclam-related ligands: trans-(cyclam)Fe(N3)2 (20), (cy-ac)FeN3 (21), trans-[(cyclam)Fe(N3)2]+ (20), [(cy-ac)FeX]+ with X = N3, Cl, OTf (CF3SO3), and F (21, 30), low-spin [(Me3cy-ac)FeN3]+ (29), [trans-(cyclam)FeN3]2N (20), [(cy-ac)Fe]2N (21), [(Me4cyclam)FeO]2+ (43), [(cy-ac)FeO]+ (21), [(TMCS)FeO]+ (TMCS = 1-mercaptoethyl-4,8,11-trimethyl-1,4,8,11-tetraazacyclotetradecane) (36), [(Me3cy-ac) FeN3]2+ (29), [trans-(cyclam)FeN(N3)]+ (20), [(cy-ac)FeN]+ (21), and 5. A plot of the Fe x-ray absorption spectroscopy (XAS) pre-edge peak energies of Fe(III), Fe(IV), Fe(V), and Fe(VI) complexes versus Fe oxidation state is also shown (white squares). The dashed and dotted lines represent least-squares fits [the Fe(IV) complex [(cy-ac)FeO]OTf is excluded in the former]. John F. Berry et al. Science 2006;312: American Association for the Advancement of Science.")
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