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Galvanostatic and potentiodynamic anode polarization methods were used to study the inhibiting effect of parsley, lettuce, and radish oils on corrosion of carbon steel L-52, used in Egypt in manufacturing pipelines, in 0.5 M NaOH solution. This effect increases with an increase in the concentration of these oils, which is due to adsorption of the basic components of the oils on the surface of the steel. The adsorption process is described by a Langmuir isotherm. It was found that incorporation of chloride ions in the 0.5 M solution of NaOH accelerates pitting corrosion of the steel as a result of moving the pitting potential toward more negative values. The investigated oils added to the solutions containing chloride ions protect steel from pitting corrosion.

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Reaction of [Cr(CO) 6 ] with 2-pyridylamidoxime (PAO) in THFunder reduced pressure resulted in the formation of the tris derivative [Cr(PAO) 3 ]. The corresponding reaction in the presence of bipyridine gave the binuclear complex [Cr 2 O 4 (PAO)(bpy)]. On the other hand, reaction of [Mo(CO) 6 ] with 2-pyridylamidoxime in air resulted in the formation of [Mo 2 O 6 (PAO) 2 ], while in the presence of bipyridine, the reaction gave two isomers with molecular formula [Mo(CO) 4 (PAO)].bpy, where bpy form hydrogen bonds to the coordinated 2-pyridylamidoxime. Reactions of [W(CO) 6 ] with PAO ligand in air yielded the complex [W 2 O 6 (PAO) 2 ]. The structures of all complexes were characterized by elemental analyses, IR, and 1 H NMR spectroscopy. The thermal properties of the complexes were also studied.