RT info:eu-repo/semantics/article T1 Synthesis of Fluorogenic Arylureas and Amides and Their Interaction with Amines: A Competition between Turn-on Fluorescence and Organic Radicals on the Way to a Smart Label for Fish Freshness A1 García Tojal, Javier A1 Cuevas Vicario, José Vicente A1 Rojo Cámara, Mª Josefa A1 Díaz de Greñu Puertas, Borja A1 Hernando Muñoz, Carla A1 García Calvo, José A1 Martín Salgado, Mateo A1 Torroba Pérez, Tomás K1 Arylureas K1 Turn-on fluorescence K1 Organic radicals K1 Smart label K1 Volatile amines K1 Química K1 Chemistry AB We describe the synthesis of fluorogenic arylureas and amides and their interaction with primary or secondary amines under air and light in organic-aqueous mixtures to give rise to a new class of persistent organic radicals, described on the basis of their electron paramagnetic resonance (EPR), as well as UV–vis, fluorescence, NMR, and quantum mechanics calculations, and their prospective use as multi-signal reporters in a smart label for fish freshness. PB MDPI SN 1420-3049 YR 2021 FD 2021-03 LK http://hdl.handle.net/10259/6139 UL http://hdl.handle.net/10259/6139 LA eng NO Funded by the NATO Science for Peace and Security Programme (Grant SPS G5536), the Junta de Castilla y León, Consejería de Educación y Cultura y Fondo Social Europeo (Grant BU263P18), and the Ministerio de Ciencia e Innovación (Grant PID2019-111215RB-100) DS Repositorio Institucional de la Universidad de Burgos RD 23-nov-2024