Dioxomolybdenum (VI), oxovanadium (IV) and iron (III) complexes ofhalf and full unit salen compounds

In our study, L1 and L2, ONN donor half-unit salen ligands, were synthesized and used from 3,4-diaminobenzophenone using 2-hydroxy-1-naphthaldehyde and 4-diethylamino salicylaldehyde, respectively. In the first part, ten alcohol-solvated dioxomolybdenum(VI) complexes, [MoO2(L1-L2)ROH] (R: CH3, C2H5, C3H7, C4H9, and C5H11), and four dioxomolybdenum(VI) complexes containing donor solvents, [MoO2(L1-L2)D] (D: DMF, DMSO), were synthesized, resulting in a total of fourteen new dioxomolybdenum(VI) complexes. Additionally, the symmetric salen oxovanadium(IV) complex of the half-unit salen ligand L2, [VOL2'], was synthesized without using an additional aldehyde. In the second part, Fe(III) and VO(IV) complexes containing asymmetric salen type ligands were obtained from half-unit salen ligands by template synthesis method under metal ion catalyst. To form the asymmetric structure, when halogen-disubstituted salicylaldehydes were used as the secondary aldehyde along with Fe(III) ions, eight Fe(III) complexes, [Fe(L3-L6)Cl], were synthesized. Similarly, from the same type of reactions, eight oxovanadium(IV) complexes, [VO(L3-L6) (H2O)].H2O, were synthesized using VO(IV) ions as the metal. Finally, the new symmetric salen ligand, H2L, and its Fe(III) and VO(IV) complexes [Fe(L)Cl], [VOL(H2O)].H2O were synthesized from the reaction of 3,4-diaminobenzophenone and 3,5-dichlorosalicylaldehyde in a 1:2 molar ratio. The structures of the synthesized ligands and complexes were suggested by physical and spectroscopic methods and thirty-five new compounds were introduced to the literature. The single crystal structures of the L1 ligand and C9, C10, C11, C14, C16 and C34 complexes were elucidated by X-ray diffraction.