Abstract
Abstract The sensitization mechanisms of three aminochalcone-type dyes with a radical-generating reagent: (E)-3-(9-Julolidinyl)-1-phenyl-2-propen-1-one (A), (E)-2-(9-julolidinyl)methylene-1-indanone (B), and (E)-2-(9-julolidinyl)methylene-1-tetralone (C) with 2,4,6-tris(trichloromethyl)-1,3,5-triazine (TRI), in poly(methyl methacrylate) film have been investigated by laser flash photolysis using a total reflection cell. The fluorescences of the dyes were efficiently quenched by TRI with static quenching distances, (RS)S, of 1.5, 1.4, and 1.3 nm for A, B, and C, respectively. The observed static quenching distances of the initial triplet absorptions of the dyes, (RS)T, were similar to those of the fluorescences. The values of (RS)T for A, B, and C, are 1.6, 1.6, and 1.5 nm, respectively. The triplet decay times of the dyes were inefficiently quenched with the rate, (kq)T, less than 106 mol−1 dm3 s−1. The results suggested that a static singlet sensitization is predominant in the photoinitiation systems.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
