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Comptes Rendus Chimie
Volume 18, n° 4
pages 391-398 (avril 2015)
Doi : 10.1016/j.crci.2014.06.002
Received : 5 February 2014 ;  accepted : 3 June 2014
Chirality at octahedral centres determined by tetradentate Schiff base ligands
 

Hadi Amiri Rudbari a, , Mostafa Riahi Farsani b, Santo Lanza c, Giuseppe Bruno c, Bahram Yadollahi a
a Faculty of Chemistry, University of Isfahan, 81746-73441 Isfahan, Iran 
b Department of Chemistry, Faculty of Sciences, Shahrekord University, P.O. Box 115, Shahrekord, Iran 
c Università degli Studi di Messina, dip. Scienze Chimiche, Viale Ferdinando S. d’Alcontres, 98166 Messina, Italy 

Corresponding author.
Abstract

1,2-bis(2′-aminophenoxy)-4-methylbenzene provides a Schiff base by reaction with 2-pyridinecarboxaldehyde. The stereochemical rigidity of ortho -aminophenyl diamines causes this latter, as well as the corresponding nitro precursors, be chiral. The chiral conformation of the diamine precursor is maintained in the octahedral zinc(II) and cobalt(II) complexes prepared from the Schiff base. The crystal structures of [ZnL(NO3 )(H2 O)]NO3 and CoLCl2 complexes exhibit non-planar cis -α configurations with both enantiomers (Δ and Λ). This implies that in the Schiff base ligand the two α-diimine systems shape an octahedral cavity having the same chirality of the precursory diamine.

The full text of this article is available in PDF format.

Keywords : Syntheses, Chirality, Schiff base, DFT, Crystal structure




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