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

Photoswitchable Arene Ruthenium Complexes Containing o-Sulfonamide Azobenzene Ligands

“…11 Remarkably, these ligands have been frequently combined with ruthenium, and the resulting complexes have found promising applications in catalysis 12−16 and as cytotoxic agents toward various cancer cell lines. 17−20 These compounds most commonly exhibit bidentate or tridentate coordination patterns such as I, 17−30 II, 13,16,31,32 III, 14,15,24,25,32,33 and IV 12 (Figure 1). In each case, the NN bond is located inside a chelate ring formed with the metal, thus preventing azobenzene photoisomerization.…”

“…The photoisomerization properties of azobenzene have been extensively exploited for the control of events at various scales and interfacing many fields such as molecular biology, pharmacology, chemistry, material sciences, physics, information, and data storage technology. − Azobenzene and its derivatives such as 2-(arylazo)­pyridines, 2-(arylazo)­pyrimidines, and 2-(arylazo)­imidazoles are also appealing compounds in coordination chemistry due to their interesting redox behavior and the strong M–L bonding resulting from their potent π-acceptor character . Remarkably, these ligands have been frequently combined with ruthenium, and the resulting complexes have found promising applications in catalysis − and as cytotoxic agents toward various cancer cell lines. − These compounds most commonly exhibit bidentate or tridentate coordination patterns such as I , − II , ,,, III , ,,,,, and IV (Figure ). In each case, the NN bond is located inside a chelate ring formed with the metal, thus preventing azobenzene photoisomerization.…”

Catalytic transfer hydrogenation of ketones by ruthenium(II) cyclometallated complex containing para-chloroacetophenone thiosemicarbazone

“…The catalytic activity of the present complex is low when compared to ruthenium complexes containing Schiff base or pincer ligands [11,19]. However, the catalytic efficiency of the complex is better than the other ruthenium complexes in the transfer hydrogenation of acetophenones with respect to catalyst/substrate ratio (1:500) and turn over numbers [20,21]. The present work describes the synthesis of cyclometallated ruthenium(II) thiosemicarbazone complex via C-H activation of para-chloroacetophenone thiosemicarbazone.…”