Synthesis, structural characterisation and catalytic application of dichloro(η 6-p-cymene){diphenyl(3-methyl-2-indolyl)phosphine}ruthenium(II) in the transfer hydrogenation of ketones

Palladium and Platinum Complexes Containing Diphenyl‐2‐(3‐methyl)indolylphosphine

“…[2][3][4] Our research group has been interested in the ligand diphenyl-2-(3-methyl)indolylphosphine (L) ( Figure 1) for some time. [5,6] This ligand contains a phosphorus donor in addition to a pendent N-H functional group which has the potential to interact directly at the metal centre itself or with co-ligands within the coordination sphere. The synthesis and coordination chemistry of L was first published by Browning back in 2004 alongside related derivative ligands.…”

“…[7,8] As a soft σ-donor and π-acceptor, the phosphorus centre preferentially coordinates to soft transition metals such as the platinum group metals. We have previously published a series of rhodium and iridium complexes, [5] and ruthenium complexes [6] containing L. In the complexes reported to date, this ligand has exhibited both κ 1 -P and κ 1 -P,η 6 -C 6 coordination phosphorus donor atom (κ 1 -P) and the pendent NH groups on the indolyl rings of the ligand are orientated so that there is some degree of interaction with the metal-chloride bonds. The unexpected reactivity of 4 with Na[B{3,5-C 6 H 3 (CF 3 ) 2 } 4 ] is also reported.…”

3-Methylindole-Based Tripodal Tetraphosphine Ruthenium Complexes in N2 Coordination and Reduction and Formic Acid Dehydrogenation

“…The isolated low oxidation state Ru I ClL1 H and Ru 0 (N 2 )L1 H complexes revealed interesting one-electron reactivity, as they were able to abstract chlorine atoms from either chloroform or dichloromethane, leading to formation of the corresponding Ru II complex. In this paper, we expand the coordination chemistry of ruthenium and 3-methylindole-based ligands [17][18][19][20][21][22][23] and investigate how modification of the ligand scaffold and its electronic properties influence the stability and activity of these complexes in dinitrogen coordination and subsequent reduction as well as in formic acid dehydrogenation. Ligand L1 H was modified using functionalized P(Ar) 2 units, wherein the arene carries either electron-withdrawing -CF 3 groups (L1 CF3 ) or electron-donating -OMe groups (L1 OMe ) in the para-position (Figure 1).…”

A re-examination of the reaction of dichloro-tris-(triphenylphosphino)ruthenium(II) with benzonitrile: Crystal structures of triphenylphosphine chloro ruthenium complexes

“…However, crystals of (L) 2 (Cl)Ru(μ-Cl) 3 Ru(NCMe)(L) 2 (L = Diphenyl-2-indolylphosphine) were isolated during attempted recrystallization of RuCl 2 (L) 3 from acetonitrile. While the structure was reported, no further characterization has appeared [8].…”

“…The P-Ru-P and P-Ru-Cl bond angles involving a phosphorus are normal and the Ru-Cl-Ru angles are near the mean distance of 82(3) o of those of the 210 compounds in the CCDB that contain a Ru(µ-Cl) 3 Ru unit [15,16]. In the only similar nitrile complex, (L) 2 (Cl)Ru(μ-Cl) 3 Ru(NCMe)(L) 2 L = Diphenyl-2-indolylphosphine, the NMR spectrum consists of "a number of poorly resolved signals" that was interpreted to indicate that the compound converts to a number of species in solution [8]. Clearly (Ph 3 P) 2 (Cl)Ru(-µ-Cl) 3 Ru(NCPh)(PPh 3 ) 2 does not exhibit similar behavior.…”