Inner transition metal complexes of the N''-[(Z)-(4-fluorophenyl)methylidene]-N'''-[(1E,2E)-2-(hydroxyimino)- 1,2-diphenylethylidene]thiocarbonohydrazide (HBMTpFB) ligand with Sm(III), Gd(III), La(III), Nd(III), Dy(III), Pr(III), Tb(III), Lu(III), Ce(III) and Ho(III) have been prepared. Their structures are elucidated by elemental analysis, molar conductance and magnetic susceptibility measurements, FT(IR), and electronic spectra. The physicochemical and analytical data reveal that the Ln(III) complexes are composed as [M(BMTpFB)2]. The 1:1 electrolytic behaviour of prepared Ln(III) complexes is suggested by molar conductivity data in nitrobenzene solvent (10-3 M) and seven coordinated geometry suggested by magnetic moment data of Ln(III) complexes. The FT(IR) spectra of lanthanide (III) complexes show that they are formed by a five-membered ring structure where the central atom is bonded to six nitrogen atoms.