Issue 4, 2003

Bis-bidentate vs. bis-tridentate imino-heterocycle ligands in the formation of dinuclear helical complexes of Fe(ii)

Abstract

By reaction of the bis-bidentate imino-quinoline ligand 1 with the octahedral cation Fe2+ in a 3 ∶ 2 metal/ligand molar ratio, a partial hydrolysis of the ligands is observed instead of the formation of the expected triple helicate, due to the excessive crowding of the trans-1,2-cyclohexyl spacers. The monomeric [FeII(2)2]2+ complex is obtained, whose crystal and molecular structure have been determined, in which the amino-imino-quinoline tridentate ligands 2, originating from 1 by loss of one quinoline aldehyde, coordinate Fe2+ with a mer disposition. Double helical complexes can instead be obtained by using the bis-tridentate ligand 3, featuring the same spacer of ligand 1, i.e.trans-1,2-cyclohexyl, and two imino-phenanthroline donor sets. The spectral and electrochemical properties of the low-spin double helical [FeII2(3)2]4+ complex have been studied and compared with those of the low spin [FeII(4)]2+ complex, which can be considered the monomeric half of the helicate. Significantly enhanced kinetic inertness and resistance to oxidation were found for the double helical complex.

Graphical abstract: Bis-bidentate vs. bis-tridentate imino-heterocycle ligands in the formation of dinuclear helical complexes of Fe(ii)

Supplementary files

Article information

Article type
Paper
Submitted
16 Oct 2002
Accepted
06 Dec 2002
First published
16 Jan 2003

Dalton Trans., 2003, 575-580

Bis-bidentate vs. bis-tridentate imino-heterocycle ligands in the formation of dinuclear helical complexes of Fe(II)

P. Pallavicini, V. Amendola, Y. Diaz Fernandez, M. Ghisalberti, L. Linati, C. Mangano, A. Manotti Lanfredi and C. Massera, Dalton Trans., 2003, 575 DOI: 10.1039/B210137H

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