Reactions of 2-(arylazo)aniline with ruthenium substrates: Isolation, characterizations and reactivities of delocalized diazoketiminato and orthometallated Ru(II) chelates

Reactions of 2-(arylazo)aniline, HL-NH2 [H represents the dissociable protons upon complexation and HL-NH2 is p-RC6H4NNC6H4-NH2; R = H for HL1-NH2; CH3 for HL2-NH2 and Cl for HL3-NH2] with Ru(H)(CO)(PPh3)3Cl and Ru(CO)3(PPh3)2 afforded products of compositions [(HL-NH)Ru(CO)Cl(PPh3)2] and [(L-NH)Ru(PPh3)2(CO)], respectively. All the complexes were characterized unequivocally. The X-ray structures of the complexes 4c and 5c have been determined. The cyclic volatammograms exhibited one reversible oxidative response in the range of 0.56–0.16 V versus SCE for [(L-NH)Ru(PPh3)2(CO)] and a quasi reversible oxidative response within 0.56–0.70 V versus SCE for [(HL-NH)Ru(CO)Cl(PPh3)2]. The conversion of ketones to corresponding alcohols has been studied in presence of newly synthesized ruthenium complexes.

Reactions of 2-(arylazo)aniline with Ru(CO)(PPh3)3(H)Cl and Ru(CO)3(PPh3)2 afforded two new ruthenium complexes. The X-ray structures of the complexes have been determined. Redox property and their ability to promote the conversion of ketones to secondary alcohols via transfer hydrogen process have been described.Figure optionsDownload as PowerPoint slide