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Abstract
Interaction of the Schiff base N-salicylidene-2-hydroxyaniline (shaH2) with M(CO)6 (M=Cr and W) in THF under reduced pressure resulted in the formation of CrO2(CO)2(shaH2) (1) and W(CO)2(shaH)2 (4). The two complexes MoO(sha) (2) and Mo2O4(sha)2 (3) were isolated from the reaction of Mo(CO)6 with shaH2 in air, depending on the reaction period. All complexes were characterised by elemental analysis, IR, mass and 1H NMR spectroscopy. The structural studies of the complexes revealed that the ligand shaH2 bonds to the metal through the oxygen atoms of the hydroxyl groups and the nitrogen atom of the imine group. Magnetic studies of 1 showed it to be paramagnetic with μeff = 2.8 BM, suggesting that Cr is in a high-spin (d2) electronic configuration. The other complexes 2–4 showed diamagnetic behaviour. Electronic spectra of the complexes in different donor solvents displayed weak visible bands due to ligand-to-metal charge transfer. The thermal properties of the complexes were investigated by thermogravimetry techniques.
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