357333-49-4Relevant academic research and scientific papers
Structures, preparation and catalytic activity of ruthenium cyclopentadienyl complexes based on pyridyl-phosphine ligand
Kumar, Prashant,Singh, Ashish Kumar,Sharma, Sanjeev,Pandey, Daya Shankar
, p. 3643 - 3652 (2010/01/18)
Ruthenium complexes [(η5-C5H5)Ru(κ1-P-PPh2Py)(PPh3)Cl] (1) and [(η5-C5H5)Ru(κ2-P-N-PPh2Py)(PPh3)]+ (1a) containing diphenyl-2-pyridylphosphine (PPh2Py) are reported. Coordinated PPh2Py in the complex [(η5-C5H5)Ru(κ1-P-PPh2Py)(PPh3)Cl] (1) exhibits monodentate behavior. In presence of NH4PF6 in methanol at room temperature it afforded chelated complex [(η5-C5H5)Ru(κ2-P,N-PPh2Py)(PPh3)]+ (1a). Further, 1 reacted with various species viz., CH3CN, NaCN, NH4SCN and NaN3 to afford cationic and neutral complexes [(η5-C5H5)Ru(κ1-P-PPh2Py)(PPh3)L]+ and [(η5-C5H5)Ru(κ1-P-PPh2Py)(PPh3)L] [L = CH3CN (1b); CN- (1c); N3- (1d) and SCN- (1e)] and it's reaction with N,N-donor chelating ligands dimethylglyoxime (H2dmg) and 1,2-phenylenediamine (pda) gave cationic complexes [(η5-C5H5)Ru(κ1-P-PPh2Py)(κ2-N-N)]PF6 [κ2-N-N = dmg (1f) and pda (1g)]. The complexes 1-1g have been characterized by physicochemical techniques and crystal structures of 1, 1a, 1c, 1e and 1f have been determined by single crystal X-ray analyses. Catalytic potential of the complex 1 has been evaluated in water under aerobic conditions. It was observed that the complex 1 selectively catalyzes reduction of aldehyde into alcohol.
Synthesis and X-ray Structures of RuCpCIL [L = )η1-PPh2py)2 and η2-triphos] and [RuCp{η3-(PPh2)3CH}][PF6]. The First η3-(PPh2)3CH complex of Ru(II)
Rida, Maurice Abou,Coperet, Christophe,Smith, Anthony K.
, p. 1 - 10 (2007/10/03)
Diphenyl-2-phosphinopyridyl (dppy) and 1,1,1-tris(diphenylphosphinomethyl)ethane (triphos) react with RuCpCl(COD), ( COD = cycloocta-1,5-diene; Cp = η5-C5H5) by the displacement of the COD ligand to give, respectively, RyCpCl(η1-dppy)2 (I) and RuCpCl(η2-triphos) (II). When RuCpCl(PPh3)2 was used as the starting material, substitution of PPh3 ligands by dppy ligands afforded a mixture of di-(I) and mono-substituted RuCpCl(dppy)(PPh3) (III) complexes. The structure of (I) has been determined by X-ray crystallography and has been refined to a final R value of 0.0516. Both dppy ligands are P-coordinated. Crystal structure analysis of (II) shows that two phosphorus atoms are coordinated to the ruthenium atom in a chelating mode, and that the third phosphorus atom is free. This structure was refined successfully to a conventional R value of 0.0495. Reaction of RuCpCl(η2-tripod) (tripod = 1,1,1-tris(triphenylphosphino)methane) with an excess of NH4PF6 gives the first η3-tripod ruthenium complex [RuCp(η3-tripod)][PF6] (IV) in 94 percent yield. The analogous triflate complex [RuCp(η3-tripod)][CF3SO3] (V) has also been prepared. Crystal structure analyses of complex (IV) shows that all three phosphorus atoms are coordinated to the ruthenium atom, and that all three P-C-P angles are less than 90 deg, leading to considerable strain in the tricyclic system. The structure was refined successfully to a conventional R value of 0.0538. Treatment of the triflate complex (V) with [(C4H9)N][Rh)CO)2Cl2] gave the known complex CpRu(μ-CO)2(μ-Ph2PCH2PPh2)RhCl2 via a P-C bond cleavage reaction.
