Add time:08/24/2019         Source:sciencedirect.com

The reaction of [(η5-C5Me5)Ru(PPh3)2Cl] (1) with acetonitrile in the presence of excess NH4PF6 leads to the formation of the cationic ruthenium(II) complex [(η5-C5Me5)Ru(PPh3)2(CH3CN)]PF6 (2). The complex (2) reacts with a series of N,N′ donor Schiff base ligands viz. para-substituted N-(pyrid-2-ylmethylene)-phenylamines (ppa) in methanol to yield pentamethylcylopentadienyl ruthenium(II) Schiff base complexes of the formulation [(η5-C5Me5)Ru(PPh3)(C5H4N-2-CHN-C6H4-p-X)]PF6 [3a]PF6–[3f]PF6, where C5Me5 = pentamethylcylopentadienyl, X = H, [3a]PF6, Me, [3b]PF6, OMe, [3c]PF6, NO2, [3d]PF6, Cl, [3e]PF6, COOH, [3f]PF6. The complexes were isolated as their hexafluorophosphate salts. The complexes were fully characterized on the basis of elemental analyses and NMR spectroscopy. The molecular structure of a representative complex, [(η5-C5Me5)Ru(PPh3)(C5H4N-2-CHN-C6H4-p-Cl)]PF6 [3e]PF6, has been established by X-ray crystallography.

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