Weak Interactions Governing the One, Two and Three-dimensional Supramolecular Architectures in Three New Nickel(II)-Hydrazone Complexes, Magnetostructural correlation and Catalytic Potential for Epoxidation of Alkenes under Phase Transfer Conditions

SADHUKHAN, D.; RAY, A.; PILET, G.; RIZZOLI, C.; ROSAIR, G. M.; GOMEZ-GARCIA, C. J.; SIGNORELLA, S.; BELLU, S.; MITRA, S.

INORGANIC CHEMISTRY

AMER CHEMICAL SOC

Año: 2011 vol. 50 p. 8326 - 8339

0020-1669

Three different ONO donor acetyl hydrazone Schiff bases have been synthesized from the condensation of acetic hydrazide with three different carbonyl compounds: salicylaldehyde (HL1), 2-hydroxyacetophenone (HL2), and 2, 3-dihydroxybenzaldehyde (HL3). The efficiency of alkene epoxidation is dramatically enhanced by lowering the pH, and the reactions are supposed to involve high valent NiIII
OCl or NiIII
O3 intermediates. 3 is the best epoxidation catalyst among the three complexes with 99% conversion and very high turnover number (TON, 396).