Chemistry - A European Journal p. 12794 - 12808 (2020)
Update date:2022-09-26
Topics:
Braunschweig, Holger
Finze, Maik
Friedrich, Alexandra
Fuchs, Sonja
Krummenacher, Ivo
Marder, Todd B.
Rauch, Florian
Sieh, Daniel
Three different perfluoroalkylated borafluorenes (FBf) were prepared and their electronic and photophysical properties were investigated. The systems have four trifluoromethyl moieties on the borafluorene moiety as well as two trifluoromethyl groups at the ortho positions of their exo-aryl moieties. They differ with regard to the para substituents on their exo-aryl moieties, being a proton (FXylFBf, FXyl: 2,6-bis(trifluoromethyl)phenyl), a trifluoromethyl group (FMesFBf, FMes: 2,4,6-tris(trifluoromethyl)phenyl) or a dimethylamino group (p-NMe2-FXylFBf, p-NMe2-FXyl: 4-(dimethylamino)-2,6-bis(trifluoromethyl)phenyl), respectively. All derivatives exhibit extraordinarily low reduction potentials, comparable to those of perylenediimides. The most electron-deficient derivative FMesFBf was also chemically reduced and its radical anion isolated and characterized. Furthermore, all compounds exhibit very long fluorescent lifetimes of about 250 ns up to 1.6 μs; however, the underlying mechanisms responsible for this differ. The donor-substituted derivative p-NMe2-FXylFBf exhibits thermally activated delayed fluorescence (TADF) from a charge-transfer (CT) state, whereas the FMesFBf and FXylFBf borafluorenes exhibit only weakly allowed locally excited (LE) transitions due to their symmetry and low transition-dipole moments.
View MoreContact:86-28-61993785
Address:No.70-13-21, North Section, Erhuan
Nantong Kaixin Pharma Chemical Co.,Ltd.
Contact:86-513-85250786
Address:2-1103 Huachen Mansion, 111 Gongnong Road,Nantong, Jiangsu, China
Zipont chem(wuhan)Tech co.,Ltd
Contact:+86-27-87587198
Address:wuhan
Jingzhou TianHe Sci&Tech Chemical Co., Ltd.
Contact:86-716-8331612
Address:Jiangjin Road, #18, High-grade technology industries development district, Jingzhou city, Hubei province
JIAXING SUNS INTERNATIONAL TRADE CO LTD
Contact:18367306858
Address:No.123,Huixin Avenue,Huimin Dist
Doi:10.1016/S0040-4039(01)00206-4
(2001)Doi:10.1055/s-2001-18780
(2001)Doi:10.1016/S0020-1693(00)88293-6
(1985)Doi:10.1016/S0040-4039(00)79975-8
(1994)Doi:10.1021/jo00148a004
(1982)Doi:10.1016/S0968-0896(02)00440-6
(2003)