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Open AccessFeature PaperArticle

Ready Access to Molecular Rotors Based on Boron Dipyrromethene Dyes-Coumarin Dyads Featuring Broadband Absorption

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Departamento de Química, Universidad de Guanajuato. Noria Alta S/N. Guanajuato, Gto. 36050, Mexico
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Departamento de Química Física. Universidad del País Vasco-EHU, Apartado 644, 48080 Bilbao, Spain
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Authors to whom correspondence should be addressed.
Academic Editor: Goze Christine
Molecules 2020, 25(4), 781; https://doi.org/10.3390/molecules25040781 (registering DOI)
Received: 15 January 2020 / Revised: 6 February 2020 / Accepted: 8 February 2020 / Published: 12 February 2020
(This article belongs to the Special Issue Exclusive Feature Papers in Colorants)
Herein we report on a straightforward access method for boron dipyrromethene dyes (BODIPYs)-coumarin hybrids linked through their respective 8- and 6- positions, with wide functionalization of the coumarin fragment, using salicylaldehyde as a versatile building block. The computationally-assisted photophysical study unveils broadband absorption upon proper functionalization of the coumarin, as well as the key role of the conformational freedom of the coumarin appended at the meso position of the BODIPY. Such free motion almost suppresses the fluorescence signal, but enables us to apply these dyads as molecular rotors to monitor the surrounding microviscosity.
Keywords: molecular rotors; BODIPY; viscosity sensors; dye chemistry; energy-electron transfer molecular rotors; BODIPY; viscosity sensors; dye chemistry; energy-electron transfer
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MDPI and ACS Style

Enríquez-Palacios, E.; Arbeloa, T.; Bañuelos, J.; Bautista-Hernández, C.I.; Becerra-González, J.G.; López-Arbeloa, I.; Peña-Cabrera, E. Ready Access to Molecular Rotors Based on Boron Dipyrromethene Dyes-Coumarin Dyads Featuring Broadband Absorption. Molecules 2020, 25, 781.

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