Main-chain organometallic polymers comprising redox-active iron(II) centers connected by ditopic N-heterocyclic carbenes

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Title: Main-chain organometallic polymers comprising redox-active iron(II) centers connected by ditopic N-heterocyclic carbenes
Authors: Mercs, LaszloNeels, AntoniaStoeckli-Evans, HelenAlbrecht, Martin
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Date: 2009
Online since: 2012-06-14T14:04:12Z
Abstract: Main-chain organometallic polymers were synthesized from bimetallic iron(II)complexes containing a ditopic N-heterocyclic carbene (NHC) ligand [(cp)(CO)LFe(NHC~NHC)Fe (cp)(CO)L]X2 (where NHC~NHC represents a bridging dicarbene ligand, L = I– or CO). Addition of a diimine ligand such as pyrazine or 4,4’-bipyridine interconnected these bimetallic complexes and gave the corresponding co-polymers containing iron centers that are alternately linked by a dicarbene and a diimine ligand. Diimine coordination was depending on the wingtip groups at the carbene ligands and was accomplished either by photolytic activation of a carbonyl ligand from the cationic [Fe(cp)(NHC)(CO)2]+ precursor (alkyl wingtips) or by AgBF4-mediated halide abstraction from the neutral complex [FeI(cp)(NHC)(CO)] (mesityl wingtips). Remarkably, the polymeric materials were substantially more stable than the related bimetallic model complexes. Electrochemical analyses indicated metal-metal interactions in the pyrazine-containing polymers, whereas in 4,4’-bipyridine-linked systems the metal centers were electronically decoupled.
Funding Details: Other funder
metadata.dc.description.othersponsorship: Swiss National Science Foundation
Alfred Werner Foundation
Type of material: Journal Article
Publisher: RSC
Journal: Dalton Transactions
Issue: 35
Start page: 7168
End page: 7178
Copyright (published version): 2009 the authors
Keywords: IronN-heterocyclic carbeneMain chain polymerElectrochemistry
Subject LCSH: Iron
Carbenes (Methylene compounds)
Organometallic polymers
Electrochemical analysis
DOI: 10.1039/B907018D
Language: en
Status of Item: Peer reviewed
Appears in Collections:Chemistry Research Collection

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