New coordination polymers based on a novel polynitrile ligand: Synthesis, structure and magnetic properties of the series [M(tcnoetOH)2(4,4′-bpy)(H2O)2] (tcnoetOH−=[(NC)2CC(OCH2CH2OH)C(CN)2]−; M=Fe, Co and Ni)

Samia Benmansour; Fatima Setifi; Carlos J. Gómez-García; Smail Triki; Eugenio Coronado

doi:10.1016/j.ica.2008.02.046

New coordination polymers based on a novel polynitrile ligand: Synthesis, structure and magnetic properties of the series [M(tcnoetOH)2(4,4′-bpy)(H2O)2] (tcnoetOH−=[(NC)2CC(OCH2CH2OH)C(CN)2]−; M=Fe, Co and Ni)

Samia Benmansour ^{1, 2} Fatima Setifi ^{3, 1} Carlos J. Gómez-García ² Smail Triki ¹ Eugenio Coronado ²

1 CEMCA - Chimie, Electrochimie Moléculaires et Chimie Analytique

2 ICMol - Instituto de Ciencia Molecular

3 UFAS1 - Université Ferhat-Abbas Sétif 1 [Sétif]

Abstract : A novel polynitrile anionic ligand, tcnoetOH−(=[(NC)2CC(OCH2CH2OH)C(CN)2]−), has been synthesized by a one-pot reaction from a cyclic acetal and malononitrile. This ligand has been successfully used to prepare, with 4,4′-bpy as co-ligand, a novel series of coordination polymers formulated as [M(tcnoetOH)2(4,4′-bpy)(H2O)2] with M(II) = Fe (1), Co (2) and Ni (3). These isostructural compounds present a linear chain structure consisting of octahedrally coordinated metal ions bridged by trans 4,4′-bpy ligands. The coordination sphere of the metal ions is completed with two terminal tcnoetOH− ligand and two water molecules. The magnetic properties indicate that the three compounds are paramagnetic, as expected from the long 4,4′-bpy bridge connecting the metal atoms. Their magnetic properties have been fitted with a model of isolated ions including a zero field splitting for the Fe(II) and Ni(II) derivatives.

Keywords : Transition metal complexes Polynitrile Chain complexes Magnetic properties

Type de document :

Article dans une revue

Inorganica Chimica Acta Reviews, Elsevier, 2008, 361 (14-15), pp.3856 - 3862. 〈10.1016/j.ica.2008.02.046〉

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Chimie

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New coordination polymers based on a novel polynitrile ligand: Synthesis, structure and magnetic properties of the series [M(tcnoetOH)2(4,4′-bpy)(H2O)2] (tcnoetOH−=[(NC)2CC(OCH2CH2OH)C(CN)2]−; M=Fe, Co and Ni)

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New coordination polymers based on a novel polynitrile ligand: Synthesis, structure and magnetic properties of the series [M(tcnoetOH)2(4,4′-bpy)(H2O)2] (tcnoetOH−=[(NC)2CC(OCH2CH2OH)C(CN)2]−; M=Fe, Co and Ni)

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