Synthesis and structural characterization of three manganese(III) complexes with N2O2 donor tetradentate Schiff base ligands: Exploration of their catalase mimicking activity
In this study, a salen-type (R)- and (S)-N-5-tert-butyl-salicylidene-1-phenylethylamine Schiff base ligands and their Pd(II) complexes were synthesized and characterized by ESI-MS, IR and NMR spectroscopies. The ligands were synthesized from the condensation of ethylenediamine with 5-fluoro-salicylaldehyde and (R)- or (S)-1-phenylethylamine with 5-tert-butyl-salicylaldehyde with high yields of 96,3-97.5 %. Their corresponding Pd(II) complexes were formed with yields around 76 %.
2,4,6-Triphenylbenzaldehyde 1 undergoes a condensation reaction with 2-aminophenol to give N-(2′,4′,6′-triphenylbenzylidene)-2-iminophenol (TPIP) 2. The imine 2 can be reduced with NaBH4 in ethanol to form N-(2′,4′,6′-triphenylbenzyl)-2-aminophenol (TPAP) 3. Addition of trimethylaluminum to 2 or 3 results in the formation of the complexes TPIP-AlMe2·AlMe3 (4) or TPAP-AlMe2 (5). Compounds 2, 3, and 4 have been crystallographically characterized.Key words: N,O ligands, aluminum, m-terphenyl, Schiff bases, X-ray crystallography.
SYNTHESIS AND STRUCTURAL CHARACTERIZATION OF PALLADIUM(II) COMPLEXES WITH TETRADENTATE N2O2 AND BIDENTATE NO-DONOR SALICYLALDEHYDE SCHIFF BASE LIGANDS