Table 2.

Spectroscopic parameters of selected S = 1 oxoiron(IV) complexes.

Complex	λmax (ε) (nm, M−1cm−1)	D (cm−1)	E/D	Ax,y,z/gnβn (T)	ΔEQ (mm/s)	η	δ (mm/s)
5(b)	770 (220)	27 (2)	0	−22, −22, −5	1.13	0.2	0.04
[FeIV(O)(N4Py)]2+(74)	695 (400)	22 (2)	0	−21, −21, −5	0.93	0	−0.04
[FeIV(O)(TPA)(NCCH3)]2+ (68)	724 (300)	28 (2)	0	−23.5, −23.5, −5	0.93	0.9	0.01
[FeIV(O)(TPA)(O2CCF3)]+ (68)	745 (300)	-	-	-	0.92	-	0.02
[FeIV(O)(L8Py2)(NCCH3)]2+ (75)	790 (260)	-	-	-	1.79	-	0.08
[FeIV(O)(TMC)(NCCH3)]2+ (28)	824 (400)	29 (2)	0	−23, −18, −3	1.23	0.5	0.17
[FeIV(O)(TMC-Py)]2+ (76)	834 (260)	29 (2)	0.15	−22.5, −22.5, −5	1.08	−0.35	0.18