Disrupting J-Aggregation in Triazatruxene Dimers to Develop Responsive Luminescent Inks for Anti-Counterfeiting Applications

Martín, Raúl ; Echeverri, Marcelo ; González, Francisco ; de Andrés, Alicia ; Ruiz Delgado, M. Carmen ; Concellón, Alberto (Universidad de Zaragoza) ; Serrano, José Luis (Universidad de Zaragoza) ; Gómez-Lor, Berta

Resumen: The fight against counterfeiting is a crucial concern for economies around the world, underscoring the urgent need for effective measures to ensure the legitimacy of products and documents. Luminescent security inks have emerged as effective tools in this battle. The third generation of these inks, incorporating stimuli‐responsive organic materials, enables unique efficiency. In this work, the stimuli‐responsive behavior of three trialkylated triazatruxene dimers (TRI1, TRI2, and TRI3), endowed with N‐alkyl chains of different length is investigated. Among them, TRI3, with three flexible dodecyl chains, shows remarkable stimuli‐responsive fluorescence that is attributed to thermally or shear‐induced phase transitions between a tetragonal columnar phase and a discotic‐nematic liquid crystal phase. Such transformation involves the breakdown of highly emissive J‐aggregates with a strong influence on the resulting emissive color. Interestingly, these stimuli‐triggered transformations are spontaneously reversed, which renders this compound very interesting in the search of third‐generation security inks.

Idioma: Inglés

DOI: 10.1002/adom.202400965

Año: 2024

Publicado en: Advanced Optical Materials (2024), 2400965 [9 pp.]
ISSN: 2195-1071

Financiación: info:eu-repo/grantAgreement/ES/AEI/CEX2023-001286-S
Financiación: info:eu-repo/grantAgreement/ES/AEI/PID2022-139548NB-I00
Financiación: info:eu-repo/grantAgreement/ES/AEI/PID2023-146811NA-I00
Financiación: info:eu-repo/grantAgreement/ES/AEI/PID2023-150022NB-I00
Financiación: info:eu-repo/grantAgreement/ES/DGA/E47-23R

Tipo y forma: Article (Published version)

Área (Departamento): Área Química Orgánica (Dpto. Química Orgánica)