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N-heterocyclic carbene-borane radicals as efficient initiating species of photopolymerization reactions under air

Tehfe, MA and Monot, J and Brahmi, MM and Bonin-Dubarle, H and Curran, DP and Malacria, M and Fensterbank, L and Lacôte, E and Lalevée, J and Fouassier, JP (2011) N-heterocyclic carbene-borane radicals as efficient initiating species of photopolymerization reactions under air. Polymer Chemistry, 2 (3). 625 - 631. ISSN 1759-9954

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Abstract

Eight N-heterocyclic carbene-boranes (NHC-boranes) are proposed as new efficient co-initiators for acrylate photopolymerization reactions. They are particularly interesting in aerated conditions, where they help overcome the classical oxygen inhibition. The carbene boryl radicals that are the initiating species have been characterized by their transient absorption spectra obtained in laser flash photolysis (LFP) experiments. Rate constants for the generation of the carbene boryl radicals by hydrogen abstraction with t-butoxyl radical and triplet benzophenone as well as the reactions with oxygen, electron rich and electron poor alkenes, two alkyl halides (CHCl3 and iodopropane) and diphenyliodonium hexafluorophosphate have been measured. The reactivity of N-heterocyclic carbene borane radicals is clearly affected by the NHC substituent. © The Royal Society of Chemistry 2011.


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Details

Item Type: Article
Status: Published
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Tehfe, MA
Monot, J
Brahmi, MM
Bonin-Dubarle, H
Curran, DPcurran@pitt.eduCURRAN
Malacria, M
Fensterbank, L
Lacôte, E
Lalevée, J
Fouassier, JP
Date: 1 March 2011
Date Type: Publication
Journal or Publication Title: Polymer Chemistry
Volume: 2
Number: 3
Page Range: 625 - 631
DOI or Unique Handle: 10.1039/c0py00296h
Schools and Programs: Dietrich School of Arts and Sciences > Chemistry
Refereed: Yes
ISSN: 1759-9954
Date Deposited: 13 Mar 2013 18:49
Last Modified: 22 Jun 2021 12:56
URI: http://d-scholarship.pitt.edu/id/eprint/17764

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