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Mediated Generation of Conjugate Acid by UV and Blue Sensitizers with Upconversion Nanoparticles at 980 nm
Author(s) -
Oprych Dennis,
Strehmel Bernd
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202005076
Subject(s) - photochemistry , chemistry , conjugate , fluorescence , benzenesulfonic acid , anthracene , photon upconversion , pyrene , ether , salt (chemistry) , nuclear chemistry , ion , organic chemistry , mathematical analysis , physics , mathematics , quantum mechanics
NIR and UV exposure of systems comprising upconversion nanoparticles ( UCNP ) based on NaYF 4 :Tm/Yb@NaYF 4 , a sensitizer absorbing either in the blue or UV region, and an onium salt with weak coordinating anion resulted in formation of conjugate acid (con‐H + ). That was namely Ivocerin (di(4‐methoxybenzoyl)diethylgermane), ITX (2‐iso‐propyl thioxanthone), anthracene, pyrene, rubrene, camphore quinone, and a strong fluorescent coumarin (1,1,6,6,8‐pentamethyl‐2,3,5,6‐tetrahyhdro‐1 H ,4 H ‐11‐oxa‐3 a ‐aza‐benzo[ de ]anthracene‐10‐one). Quantification occurred by treatment with Rhodamine B lactone whose color switched to intensive red after photolytic formation of con‐H + . Exposure with a NIR laser at 980 nm resulted in less con‐H + compared to 395 nm where all sensitizers absorb radiation. UCNP did not mainly interfered formation of con‐H + . The different rates obtained in both experiments responsibly explain the failure and success to initiate polymerization of epoxides applying ether 980 nm or 395 nm excitation, respectively.