The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: Tricyclohexylphosphonium tetrafluoroborate( cas:58656-04-5 ) is researched.Safety of Tricyclohexylphosphonium tetrafluoroborate.Hu, Yingqi; Hou, Yuqi; Wang, Zhijia; Li, Yanqin; Zhao, Jianzhang published the article 《3,5-Anthryl-Bodipy dyad/triad: Preparation, effect of F-B-F induced conformation restriction on the photophysical properties, and application in triplet-triplet-annihilation upconversion》 about this compound( cas:58656-04-5 ) in Journal of Chemical Physics. Keywords: anthryl Bodipy dyad triad synthesis triplet annihilation upconversion photosensitizer. Let’s learn more about this compound (cas:58656-04-5).
We prepared a series of compact Bodipy-anthryl electron donor/acceptor triads and dyads by attaching anthryl moieties at the 3-,5-positions of the Bodipy core, with a novel conformation restriction approach, to study the spin-orbit charge transfer intersystem crossing (SOCT-ISC). The conformation restrictions are imposed by the BF2 unit of Bodipy without invoking the previously reported method with 1,7-di-Me or 1,3-di-Me groups. Our new approach shows a few advantages, including the stronger electron accepting ability of the methyl-free Bodipy core (reduction potential anodically shifted by +0.3 V vs. the methylated Bodipy), red-shifted absorption (by 21 nm), and longer triplet state lifetime (372μs vs. 126μs). The effects of the different mutual orientations of the electron donor and acceptor on UV-visible absorption, fluorescence, triplet state quantum yields, and lifetimes were studied. Triads with orthogonal geometries show higher singlet oxygen quantum yields (ΦΔ = 37%) than those with more coplanar geometries. Since the non-radiative decay for the S1 state is significant in the parent Bodipy chromophore (ΦF = 6.0%), we propose that in dyads/triads, the charge separation and recombination-induced ISC outcompete the non-radiative decay to the ground state, which is new in the study of SOCT-ISC. D. functional theory computation indicated a shallow torsion potential energy curve as compared to the meso-anthryl-Bodipy dyad analog, which may contribute a low triplet state quantum yield of the new dyads/triads. Triplet-triplet annihilation upconversion was performed with the electron donor/acceptor dyads as the triplet photosensitizer, with an upconversion quantum yield of 12.3%. (c) 2020 American Institute of Physics.
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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem