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Thin films of cyclotriphosphazenes containing 1,3,4-oxadiazoles as fluorophores

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Abstract

In this work, hexa-substituted cyclotriphosphazenes bearing 1,3,4-oxadiazole groups as fluorophores were employed in the formation of thin films. The cyclotriphosphazenes compounds as well as the films exhibited photoluminescence with emission in the UV-blue region. Fluorescence quantum yields of cyclotriphosphazenes range between 0.04 and 0.10. The bandgap of cyclotriphosphazenes was 4 eV showing properties of wide bandgap semiconductors. The morphological characterization of the films by SEM and AFM showed homogeneous surfaces without defects. The optical properties of cyclotriphosphazenes are different when they are in solution and thin films because of favorable binding supramolecular interactions. In thin films, the supramolecular interaction enhances the optical properties of these materials.

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Acknowledgments

The authors thank M. Aguilar, D. Quiterio and J. Cañetas from Microscopy Laboratory of IF-UNAM for the technical support. M. Caldera-Villalobos thanks DGAPA for the postdoctoral grant. V. Alvarez-Venicio acknowledges CONACyT for the cathedra 411-2016. The authors would like to express their gratitude to Martín Cruz-Villafañe (ICN-UNAM) for the technical support provided.

Funding

This research was funded by PAPIIT (Project IN207421). MRH acknowledge PAPIIT Grant 112420.

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Authors and Affiliations

  1. Departamento de Química de Radiaciones y Radioquímica, Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, 04510, Ciudad de México, México

    Martín Caldera-Villalobos, Violeta Álvarez-Venicio & M. del Pilar Carreón-Castro

  2. Laboratorio de Polímeros, Instituto de Ciencias Básicas e Ingeniería, Universidad Autónoma del Estado de Hidalgo, Carretera Pachuca-Tulancingo, Colonia Carboneras, Km 4.5, 42184, Mineral de la Reforma, Hidalgo, México

    Ana M. Herrera-González

  3. LabMOr, Departamento de Química, Facultad de Ingeniería, Universidad de Buenos Aires, Av. Paseo Colón, 850, CABA, Argentina

    Miriam Martins-Alho

  4. Instituto de Física, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510, Ciudad de México, México

    Margarita Rivera

Authors
  1. Martín Caldera-Villalobos
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  2. Ana M. Herrera-González
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  5. Margarita Rivera
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  6. M. del Pilar Carreón-Castro
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Correspondence to M. del Pilar Carreón-Castro.

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Caldera-Villalobos, M., Herrera-González, A.M., Álvarez-Venicio, V. et al. Thin films of cyclotriphosphazenes containing 1,3,4-oxadiazoles as fluorophores. J Coat Technol Res 19, 295–302 (2022). https://doi.org/10.1007/s11998-021-00524-7

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