Synthesis and preparation of a square pyramidal Fe(III) complex with an N2S2-type ligand which can provide a strong σ donor sets of 4-. The strong ligand field makes the Lewis acidity of the metal center decrease. The Fe(III) complex showed a intermediate spin state and reduced to Fe(II) species at -0.77 V vs. NHE. The complex also easily reacted with NO molecule under Ar atmosphere to form a nitrosyl complex, which is confirmed with an appearance of N-O stretching mode at 1809 cm. The reaction exhibited a clear spectral change: An absorption band at 525 nm shifted to 660 nm, which is responsible for a color change from reddish-orange to pale green. Furthermore, the same color change was also observed in a solid state.