Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 3, Issue 28, Pages 7421-7427Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5tc01529d
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Funding
- Italy by MIUR [FIRB 2003: RBNE033KMA, FIRB 2004: RBPR05JH2P]
- U.K. by Durham University
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The acidochromic behaviour of trans-5-(p-(N, N-diphenylamino)styryl)-1,3-di(2-pyridyl)benzene (1) and 5-(p-(N, N-diphenylamino) phenylethynyl)-1,3-di(2-pyridyl) benzene (2) was investigated, both in solution and doped into films, studying their linear and nonlinear optical properties. Remarkably, the efficient luminescence of 1 drops drastically upon protonation and is restored upon deprotonation - both in solution and in the solid state - leading to an excellent on/off emissive acido-triggered reversible switch. In parallel, protonation leads to a large enhancement of the second-order NLO response, as determined by the EFISH technique, which is reversible upon deprotonation. The related methylated salts of 1 and 2 are similarly characterized by a high NLO response.
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