title: Probing Force with Mechanobase-Induced Chemiluminescence.
abstract: Mechanophores capable of releasing N-heterocyclic carbene (NHC), a strong base, are combined with triggerable chemiluminescent substrates to give a novel system for mechanically induced chemiluminescence. The mechanophores are palladium bis-NHC complexes, centrally incorporated in poly(tetrahydrofuran) (pTHF). Chemiluminescence is induced from two substrates, adamantyl phenol dioxetane (APD) and a coumaranone derivative, upon sonication of dilute solutions of the polymer complex and either APD or the coumaranone. Control experiments with a low molecular weight Pd complex showed no significant activation and the molecular weight dependence of the coumaranone emission supports the mechanical origin of the activation. The development of this system is a first step towards mechanoluminescence at lower force thresholds and catalytic mechanoluminescence.
authors.affiliation: Laboratory of Macromolecular and Organic Chemistry and the Institute for Complex Molecular Systems, Eindhoven University of Technology, P.O. Box 513, 5600, MB, Eindhoven, The Netherlands.
authors.forename: Jess M
authors.initials: JM
authors.lastname: Clough
authors.affiliation: Laboratory of Macromolecular and Organic Chemistry and the Institute for Complex Molecular Systems, Eindhoven University of Technology, P.O. Box 513, 5600, MB, Eindhoven, The Netherlands.
authors.forename: Abidin
authors.initials: A
authors.lastname: Balan
authors.affiliation: Laboratory of Macromolecular and Organic Chemistry and the Institute for Complex Molecular Systems, Eindhoven University of Technology, P.O. Box 513, 5600, MB, Eindhoven, The Netherlands.
authors.forename: Tom L J
authors.initials: TL
authors.lastname: van Daal
authors.affiliation: Laboratory of Macromolecular and Organic Chemistry and the Institute for Complex Molecular Systems, Eindhoven University of Technology, P.O. Box 513, 5600, MB, Eindhoven, The Netherlands. r.p.sijbesma@tue.nl.
authors.forename: Rint P
authors.initials: RP
authors.lastname: Sijbesma
keywords: N-heterocyclic carbenes; chemiluminescence; mechanochemistry; palladium; polymers