188547-24-2Relevant articles and documents
A four-membered C,O-chelate : Two families of ruthenium organometallics incorporating N ... O hydrogen bonding
Ghosh, Prasanta
, p. 1343 - 1349 (2008/10/09)
The reaction of mono-Schiff bases of 4-methyl-2,6-diformylphenol and primary amines (p-XC6H4NH2, X = OMe, Cl, CO2Et and NO2) with Ru(PPh3)3Cl2 in boiling ethanol afforded violet diamagnetic complexes, [Ru(η2:-p-XC6H4L) (PPh3)2(CO)Cl] (η2-p-XC6H4L = [4-methyl-6-(N-p-Xphenyliminiomethyl) phenolato-C2,O] incorporating the unprecedented orthoruthenated phenolato function, which is hydrogen-bonded with the uncoordinated imine nitrogen. These complexes were found to react with sodium benzoates (p-ZC6H4COO, Z = Me, Cl) to generate the new aryl complexes of ruthenium. [Ru(η1-p-XC6H4L)(P-Ph3) 2(CO)(η2-p-ZC6H4COO)]. The spectral (IR, UV-vis and 1H NMR) features of these two types of complexes and the effect of the X substituent on electronic and 1H NMR spectra are scrutinized. The effect of PPh3 ring currents on the chemical shifts of the metallated ring protons is semiquantitatively estimated. In these complexes different types of novel intramolecular N ... O interaction and the conformational orientation of p-XC6H4L ligands are noted. The redox behaviour of these complexes is reported. The E1 2 values of RuIII/RuII couple correlate linearly with the Hammett constants (σ) of X substituent in the halo complexes. A spectroelectrochemical correlation in these complexes is also observed. Copyright
