| Abstract |
The tetradentate diaminobis(phenolato) ?salan? ligand precursors, N,N?-bis-(2-hydroxy-3-iPr-5-Cl-6-Me-benzyl)4-methylimidazolidine (H2L1) is synthesized. Reaction of H2L1 with MoO2(acac)2, FeCl3, VOSO4 and Ni(OAc)2, resulted in the formation of [MoO2(L1A)] (1), [(Fe(L1A))2(?-Cl)(?-OCH3)], (2), [(VO(L1A))2(?-O)]?THF (3) and [Ni (L1A)] (4), wherein (L1A)2- resulted from the loss of the capping ?CH2- moiety of H2L1 upon complex formation. However the capping ?CH2- moiety between the two N-amine atoms is retained in the reaction of H2L1 with Ti (OiPr)4, resulting in formation of the dinuclear complex [(Ti(L1)(OiPr))2(?-O)] (5). All compounds obtained are characterized by various physicochemical techniques (elemental analysis, IR, UV?Vis and NMR spectroscopy, and ESI-MS), and by single crystal X-ray diffraction analysis in the case of complexes 1?3. The several factors relevant for the formation of the compounds, as well as cleavage or non-cleavage of the ?CH2- bridge in the salan ligands, are elucidated with the help of DFT calculations. |
