Synthesis of Star-Shaped Macromolecular Schiff Base Complexes Having Melamine Cores and Their Magnetic and Thermal Behaviors
We aim to study magnetic and thermal behaviors of some melamine cored macromolecular Schiff base complexes. In this context, tripodal ligands were synthesized by reacting melamine with 4-carboxybenzaldehyde or 4-hydroxybenzaldehyde. Then, 16 new trinuclear Fe(III), Cr(III), Mn(III),
and Al(III) complexes were synthesized by reacting the ligands [tris-(4-carboxybenzimino)-1,3,5-triazine) or tris-(4-hydroxybenzimino)-1,3,5-triazine)] with pentadentate Schiff bases N,N′-bis(1-hydroxy-2-benzyliden)-1,7-diamino-4-azaheptane or N,N′-bis(salicylidene)pyridine-2,6-diamine.
Later, ligands and complexes were characterized by means of elemental analysis, infrared spectroscopy, 1H NMR, liquid chromatography–mass spectrometry, thermal analyses, and magnetic susceptibility measurements. Finally, metal ratios of the prepared complexes were determined
by using atomic adsorption spectrometry. The complexes were also characterized as distorted octahedral high-spin d
3 (S = 3 × 1/2) Cr(III), high-spin d
5 (S = 5 × 1/2) Fe(III), low-spin d
4
(S = 2 × 1/2) Mn(III), and diamagnetic Al(III) bridged by ‐OH group of COO− or OH group of phenol.
Keywords: Melamine; Schiff bases; metal complexes; s-triazine; saldeta; salpy
Document Type: Research Article
Affiliations: Faculty of Science, Department of Chemistry, University of Selçuk, Konya, Turkey
Publication date: 01 April 2012
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