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Pentacoordinate Fe(III) complexes [Fe(LMeO)2X] and [Fe(LEtO)2X], X = Cl and Br, show the slow magnetic relaxation that is enhanced by the applied static magnetic field. A substitution of the distant ethoxy group to the methoxy group residing at the phenyl ring of a Schiff base N,O-donor ligand (LMeO vs LEtO) considerably influences the relaxation characteristics. In the chlorido complex [Fe(LMeO)2Cl], the following three slow relaxation channels are recognized as possessing different relaxation times τLF = 0.47 s, τIF = 13 ms, and τHF = 2