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Complexes of iron(III) and chromium(III) salen and salophen Schiff bases with bridging 1,3,5‐triazine derived multidirectional ligands
Author(s) -
Koç Ziya Erdem
Publication year - 2011
Publication title -
journal of heterocyclic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.321
H-Index - 59
eISSN - 1943-5193
pISSN - 0022-152X
DOI - 10.1002/jhet.577
Subject(s) - chemistry , ethylenediamine , cyanuric chloride , triazine , schiff base , chromium , octahedron , chloride , polymer chemistry , medicinal chemistry , nuclear magnetic resonance spectroscopy , metal salen complexes , cyanuric acid , crystallography , stereochemistry , inorganic chemistry , organic chemistry , metal , melamine , crystal structure
A new synthetic route for preparing multidirectional ligands was developed by using 2,4,6‐trichloro‐1,3,5‐triazine (cyanuric chloride) as core. The reaction included the selective substitutions of 4‐aminobenzoic acid onto three chlorides of the triazine ring via a stepwise manner at 1:1, 1:2, or 1:3 equiv. and 0, 25, 130°C, respectively. An efficient synthesis of a novel class of “multidirectional ligands” has been developed based on high‐yielding chloride substitutions of 2,4,6‐trichloro‐1,3,5‐triazine by amines. Sixteen new mono‐, di‐, tri‐, and tetra‐nuclear Fe(III) and Cr(III) complexes involving tetradenta Schiff bases N,N ′‐bis(salicylidene)ethylenediamine‐(salenH 2 ) or bis(salicylidene)‐ o ‐phenylenediamine‐(salophenH 2 ) with two new 1,3,5‐triazine derived multidirectional ligands were synthesized and characterized by means of elemental analysis, 1 H NMR, FT‐IR spectroscopy, LC‐MS analysis, AAS, thermal analysis, and magnetic susceptibility measurements. The complexes were also characterized as low‐spin distorted octahedral Fe(III) and Cr(III) bridged by carboxylic acids. It was understood that the [{Fe(salen)/(salophen)} 2 O] and [{Cr(salen)/(salophen)} 2 O] containing compounds could be represented by the electronic structure of t 2 g 5e g 0and t 2 g 3e g 0 . J. Heterocyclic Chem., (2011).