The synthesis and characterization of [M(salen/salophen/saldeta)] [M=Cr(III), Mn(III) or Fe(III)] capped s-triazine cored tripodal trinuclear Schiff bases complexes

Abstract

Ligand complexes ([M(salen/salophen)]2O, [M(saldeta)]Cl shortened as LC, M=Cr(III), Mn(III) or Fe(III)), have been synthesized. 2,4,6-tris(4-formylphenoxy)-1,3,5-triazine (3) was synthesized with the reaction of p-hydroxybenzaldehyde (2) and cyanuric chloride (1). 2,4,6-tris(4-(4′-carboxyphenylimino)phenoxy)-1,3,5-triazine (5) was synthesized with the reaction of 2,4,6-tris(4-formylphenoxy)-1,3,5-triazine (3) and 4-aminobenzoic acid (4). 2,4,6-tris(4-(4-carboxyphenylimino)phenoxy)-1,3,5-triazine was treated with SOCl2 in CH3CN, and 2,4,6-tris(4-(4′-chloroformylphenylimino)phenoxy)-1,3,5-triazine (6) was obtained. 2,4,6-tris(4-(4′-chloroformylphenylimino)phenoxy)-1,3,5-triazine was reacted with 4-aminobenzoic acid or 4-hydroxbenzoic acid in CH3CN, and 2,4,6-tris(4-(4′-(4′′-carboxyphenylamido)phenylimino)phenoxy)-1,3,5-triazine (8) and 2,4,6-tris(4-(4′-(4′′-carboxyphenylformato)phenylimino)phenoxy)-1,3,5-triazine (9) were obtained. s-Triazine cored tripodal trinuclear Schiff bases complexes were synthesized with the reaction of 8 and/or 9 and ligand complexes. The complexes have been characterized as low-spin (S = 1/2) distorted octahedral Fe(III)Salen/Salophen, low-spin (S = 1) distorted octahedral Mn(III)Salen/Salophen, high-spin (S = 5/2) distorted octahedral Fe(III)Saldeta, high-spin (S = 2) distorted octahedral Mn(III)Saldeta and (S = 3/2) distorted octahedral Cr(III)Salen/Salophen/Saldeta bridged by COO− groups. The structure of all ligand and complexes were identified by using elemental analysis, thermal analyses (TGA-DTG), magnetic susceptibility, ESI-MS, ICP–AES, UV–Vis, 1H-NMR, 13C-NMR and FT-IR spectral data.