Control of spins by ring deformation in a diiron(Ⅲ)bisporphyrin: reversal of ClO_4~- and CF_3SO_3~- ligand field strength in the magnetochemical series

摘要

The complete reversal of the ligand field strength of ClO_4~- and CF_3SO_3~- in the magnetochemical series is observed in a diiron(Ⅲ)bisporphyrin. While ClO_4~-, as the axial ligand, gives a typical high-spin complex, just twisting the conformation of the porphyrin macrocycle gives properties of a pure intermediate-spin state with CF_3SO_3~-, although the axial ligand strengths suggest the reverse order of spin stabilization.