130378-33-5Relevant academic research and scientific papers
Acetylacetonato chelated ruthenium organometallics incorporating imine-phenol function: Spectroscopic, structural, electrochemical and cytotoxicity studies
Mallick, Suman,Ghosh, Mrinal Kanti,Sarkar, Ananda,Jana, Samir,Bhattacharyya, Arindam,Mohapatra, Sudip,Chattopadhyay, Swarup
, p. 36 - 45 (2015/03/18)
The heterogeneous phase reaction of Ru(η2-RL)(PPh3)2(CO)Cl, 1 with lithium acetylacetonate (Liacac) afforded the complexes of the type Ru(η1-RL)(PPh3)2(CO)(acac), 2 in excellent yield where
A Family of Ruthenium Aryls Incorporating an η-Bonded Nitrite or Nitrate and a Pendant Imine - Phenol Function
Ghosh, Prasanta,Chakravorty, Animesh
, p. 64 - 69 (2008/10/09)
The reaction of carbonylchloro[4-methyl-6-(NR-iminio)phenolato-C 2O]bis(triphenylphosphine)ruthenium(II), Ru11(η-RL)(PPh3)2(CO)CI (R = Ph, p-MeC6H4), 1, with NaY (Y = NO2, NO3) has afforded new organometallics of the type carbonyl(nitrito or nitrato)[4-methyl-6-(NR-imino)phenol-C 2]bis(triphenylphosphine)ruthenium(II). Ru11(η1-RL)(PPh3) 2(CO)(η2-Y) (2, Y = NO2; 3, Y = NO3). The transformation probably occurs via associative cis attack on chloride by Y-. The reconversion 2(3) → 1 is achievable by treating 2 (3) with excess halide. The X-ray structures of Ru(η1-PnL)(PPh3)2(CO)(η 2-NO2) and Ru(η1-PhL)(PPh3)2(CO)(η 2-NO3) have revealed the presence of (i) O,O'-chelated Y-, (ii) monodentate PhL binding via an aromatic carbon atom lying cis to the CO molecule, and (iii) O(phenolic)?N(imine) hydrogen bonding. The interconversion between 1 and 2 (3) is attended with iminium - phenolate to imine - phenol tautomerization and a change in the rotational conformation of the RL ligand. Crystal data for the complexes are as follows. Ru(η1-PhL)(PPh3)2(CO)(η 2-NO2): crystal system, monoclinic; space group, P21/c; a = 18.597(9) A?, b = 11.947(7) A?, c = 20.362(5) A?, β= 101.15(3)°; V = 4439(4) A?3; Z = 4; R = 0.0427; Aw = 0.0458. Ru(η1-PhL)(PPh3)2(CO)(n2-NO 3: crystal system, monoclinic; space group, P21/c; a = 18.726(11) A?, b = 11.857(4) A?, c = 20.443(8) A?, β = 102.77(4)°; V = 4426(3) A?3; Z = 4; R = 0.0654; Rw = 0.0659.
Decarbonylative metalation of diformylphenol Schiff bases: New osmium and ruthenium organometallics incorporating the iminium-phenolato zwitterionic motif
Ghosh, Prasanta,Bag, Nilkamal,Chakravorty, Animesh
, p. 3042 - 3047 (2008/10/08)
The reaction of Schiff bases of 2,6-diformyl-4-methylphenol with M(PPh3)3X2 in ethanol has afforded carbonylhalo[4-methyl-6-(N-R-iminiomethyl)phenolato-C 2,O]bis(triphenylphosphine)metal(II) compounds, MII(RL)(PPh3)2(CO)X (M = Os, X = Br; M = Ru, X = Cl; R = alkyl, aryl). The process is believed to proceed via oxidative addition of the aldehydic C(O)-H bond to the metal followed by CO extrusion and reductive proton elimination. The X-ray structure of Os(EtL)(PPh3)2(CO)Br·CH2Cl2 has revealed the presence of the distorted octahedral OsC2P2BrO coordination sphere. In the four-membered, Os(C,O) chelate ring, the metal atom is bonded to the carbon site to which an aldehyde group was attached in the parent ligand. The presence of the iminium-phenolato zwitterionic motif is consistent with the N?O length as well as with IR and 1H NMR spectra. Bond parameters of the osmium and ruthenium systems are compared. Significant dπ-pπ back-bonding with the metalated aromatic ring occurs in the case of osmium. The complexes display a quasi-reversible one-electron cyclic voltammetric couple (E1/2 = 0.50-0.70 V), but the oxidized congeners are too unstable to be isolated. Upon reaction of M(RL)(PPh3)2(CO)X with carboxylates, the latter gets chelated, the M-O(phenolato) linkage is cleaved, and the iminium-phenolato function tautomerizes to the imine-phenol function.
