The products with the general formulas VO(Salits) 1, Mn(Salits)Br 2, Fe(Salits)Cl 3 and UO2(Salits)(MeOH) 4 (Salits = N1,N4-bis(salicylidene)-S-allyl-thiosemicarbazide) are prepared by the reaction of salicylaldehyde-S-allyl-thiosemicarbazone (H2L) and salicylaldehyde with VOSO43H2O, Mn(CH3COO)24H2O, FeCl36H2O and UO2(CH3COO)22H2O, respectively. Complexes 1–4 were characterized by elemental analysis, spectroscopic (FT-IR and UV–Vis) and TGA techniques. Crystal and molecular structures of the complexes were determined by single crystal X-ray diffraction. The results revealed that the complexes 1, 2 and 3 contain a dideprotonated tetradentate form of Salits coordinated via N2O2 donors along with oxido, bromido or chlorido ligands, respectively, and they have distorted square pyramidal geometries. However, the complex 4 adopts a severely distorted pentagonal bipyramidal geometry consisting of N2O2 coordination of Salits, a methanol ligand and two oxygens of the uranyl moiety. TG analysis howed that complex 3 is more stable than the others.

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