The electronic spectral **data** of all the diiron(III) complexes are summarized in Table 3 and the typical electronic absorption spectrum of 2 is shown in Fig. 3. In MeOH : ACN (1 : 3 v/v) solvent mixture, all the present diiron(III) complexes exhibit two absorption bands in the ranges 250-285 and 370-400 nm. The lower energy band in the range 370-400 nm is assigned to weak m-oxo-to-Fe(III) ligand to metal charge transfer transition (LMCT). The higher energy band in the range 250-285 nm is assigned to p-p* transition in the ligand moiety. The spectral properties of all the diiron(III) complexes are very similar to those found for all of the previously reported diiron(III) complexes of the same type, revealing the similarities in the structures of these complexes. 47,58 Also, there is no signicant difference in spectral behavior of the diiron(III) complexes and mononuclear iron(III) complexes of the same ligand has been observed. It has been previously reported that the m-oxo-to-Fe(III) CT transition for all the diiron(III) complexes has been found to be blue-shied when the Fe-O-Fe bond angle of diiron(III) core changes. 83 Thus, for the (m-oxo)diiron(III) complexes, upon increasing the Fe-O-Fe angle, the 400- 84 We have also observed the same blue shi when the bond angle tends to become 180 .