“Push-no-pull” porphyrins for second harmonic generation imaging
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2013
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Royal Society of Chemistry
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López-Duarte I, Reeve JE, Pérez-Moreno J, Boczarow I, Depotter G, Fleischhauer J, et al. “Push-no-pull” porphyrins for second harmonic generation imaging. Chem Sci [Internet]. 2013 [citado 17 de enero de 2025];4(5):2024. Disponible en: https://xlink.rsc.org/?DOI=c3sc22306j
Abstract
The established approach to design a molecule with strong second-order nonlinear optical (NLO) activity is to connect an electron-donor to an electron-acceptor via a pi-conjugated bridge, to generate push-pull system. Surprisingly, we have found that dyes with large first hyperpolarizabilities, and which exhibit strong second harmonic generation (SHG), can be created just by attaching an electron-donor to a porphyrin. The free-base porphyrin core is sufficiently electron-deficient that the hyperpolarizability does not increase on addition of a pyridinium electron-acceptor.