Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 55, Issue 4, Pages 1445-1449Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201508840
Keywords
chemiluminescence; mechanochemistry; N-heterocyclic carbenes; palladium; polymers
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Funding
- Council for Chemical Sciences of the Netherlands Organization for Scientific Research (CW-NWO)
- Ministry of Education, Culture and Science [024.001.035]
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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.
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