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Main-chain organometallic polymers comprising redox-active iron(II) centers connected by ditopic N-heterocyclic carbenes
Date Issued
2009
Date Available
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.
Sponsorship
Other funder
Other Sponsorship
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
Subject – LCSH
Iron
Carbenes (Methylene compounds)
Organometallic polymers
Electrochemical analysis
Language
English
Status of Item
Peer reviewed
This item is made available under a Creative Commons License
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