Investigation of dipodal acetoguanamine-Schiff bases and their homonuclear Fe^III complexes

Abstract

The ligands 2,4-bis(2-hydroxyphenyliminomethyl)-6-methyl-1,3,5-triazine (AGSAL), 2,4-bis(2-carboxyphneyliminomethyl)-6-methyl-1,3,5-triazine (AG2FBA), and 2,4-bis(4-carboxyphneyliminomethyl)-6-methyl-1,3,5-triazine (AG4FBA) were prepared with a Schiff base condensation between acetoguanamine and the corresponding salicylaldehyde, 2-formylbenzoic acid, and 4-formylbenzoic acid. High-spin (S = 5/2) complex [Fe^III(AGSAL)Cl] was obtained by complexation of AGSAL with FeCl₃. Then, binuclear complexes [{Fe^III(AGSAL)}₂(AG2FBA)] and [{Fe^III(AGSAL)}₂(AG4FBA)] were prepared by combination of [Fe^III(AGSAL)Cl] and “(AG2FBA), (AG4FBA),” respectively. Then, trinuclear complexes [{Fe^III(AGSAL)}₂(Fe^IIIAG2FBA)] and [{Fe^III(AGSAL)}₂(Fe^IIIAG4FBA)] of the ligands were prepared by reaction of the binuclear complexes and FeCl₃ salt. A weak antiferromagnetic exchange was found for all complexes. Finally, the structures of ligands and complexes were identified by using elemental analysis, magnetic susceptibility, ¹H NMR, ¹³C NMR and FT-IR spectral data.

KEYWORDS:

• Acetoguanamine
• Schiff base
• s-triazine
• Fe^III complexes
• carboxylic acid

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by Scientific Research Projects (BAP) of Selcuk University (grant: 2012/11211098).