Multicolor Organometallic Mechanophores for Polymer Imaging Driven by Exciplex Level Interactions
Georgy A. Filonenko (TU Delft - Applied Sciences)
Dapeng Sun (TU Delft - Applied Sciences)
Manuela Weber (Freie Universität Berlin)
Christian Müller (Freie Universität Berlin)
Evgeny A. Pidko (TU Delft - Applied Sciences, TU Delft - ChemE/Algemeen, ITMO University)
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Abstract
Photoluminescent compounds can undergo various structural changes upon interaction with light. When these changes manifest themselves in the excited state, the resulting emitters can obtain a sensory function. In this work, we designed coordination compounds that can vary their emission color in response to thermal and mechanical stimuli. When embedded in a polymer matrix, Cu-NHC sensors act as mechanophores, and their color-based response can readily describe mechanical stress and phase transition phenomena. A strong practical advantage of new mechanophores over previous generations of organometallic stress sensors stems from their reliance on emission color variations that are easy to detect. In a broad context, our work implies that emission color variations that we often view as thermally governed can also be triggered mechanically and used to generate sensory information.
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