184299-80-7Relevant academic research and scientific papers
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 (1997)
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.
