Chemistry of ruthenium with some phenolic ligands: synthesis, structure and redox properties

Ortho-metallated ruthenium(III) complexes with some acid hydrazide based Schiff bases

“…Three strong bands observed in the ranges 741-747, 693-696 and 515-521 cm À1 indicate the presence of ruthenium bound PPh 3 . Similar bands are reported for complexes containing the trans-{Ru(PPh 3 ) 2 } unit [12,[28][29][30].…”

“…The spectral profiles are quite similar. The moderately intense absorptions in the visible region are perhaps due to the ligand-to-metal charge transfer transitions [10][11][12][13]27,29,30]. The intense absorptions in the higher energy region are likely to be due to the ligand based transitions.…”

The synthesis and electrochemical behavior of ruthenium(III) bipyridine complexes: [Ru(dcbpy)Cl4]− (dcbpy = 4,4′-dicarboxylic acid-2,2′-bipyridine) and [Ru(bpy)Cl3L] (L = CH3OH, PPh3, 4,4′-bpy, CH3CN)

“…Partly due to this, the oxidation state +II of the ruthenium center has been extensively investigated, and versatile electrochemical [3] and light-harvesting properties have been found [4]. Less attention has been paid to the octahedral Ru(III) compounds although there are examples of catalytic applications of Ru(III) complexes, containing triphenylphosphine [5][6][7], diphosphine [8], amide [9,10] Schiff base [11,12] ligands. Furthermore, only a few mononuclear ruthenium(III) carbonyl complexes have been synthesized [13] even though the corresponding Ru(II) complexes are well-known [14][15][16].…”

Ruthenium(III) Complexes with a Phenolate‐O, Imine‐N, and Amide‐O Coordinating Ligand: Syntheses, Structures, Properties, and Protonation Studies of Coordinated Amide

“…These absorptions are assigned to the phenolatepπ to the metal-dπ charge-transfer transitions. [7] Interestingly, [Ru(Hacs) 2 ]ClO 4 , where both the amide functionalities of the ligands are protonated, displays the first band at lower energy (699 nm) whereas the completely deprotonated species K[Ru(acs) 2 ] displays the same band at higher energy (626 nm). The band position shift suggests that the energy gap between the phenolate-pπ and the metal-dπ levels is significantly decreased due to the protonation of the O-coordinating amide functionalities of the two ligands.…”