Dalton Transactions p. 3207 - 3215 (2021)
Update date:2022-08-29
Topics:
Kim, Mingi
Im, Sehee
Ryu, Chan Hee
Lee, Seok Ho
Hong, Ju Hyun
Lee, Kang Mun
5-Phenyl-1,2,4-triazole-appendedcloso- (CB1andCB2) andnido-o-carboranyl (nido-CB1andnido-CB2) compounds were prepared and fully characterized using multinuclear NMR spectroscopy and elemental analysis. The solid-state molecular structures of bothcloso-compounds were analyzed by X-ray crystallography. Although thecloso-compounds exhibited dual emissive patterns in the rigid state (in THF at 77 K), which were assignable to a π-π* local excitation (LE)-based emission (λem=ca. 380 nm) on the triazole moieties and to an intramolecular charge transfer (ICT)-based emission (ca. 460 nm) in which theo-carborane units acted as the acceptor (A), at 298 K in THF, the LE-based emission dominated. In contrast, thenido-compounds exhibited an intensive emission originating from ICT transitions in which theo-carborane units reversibly acted as the donor (D). In particular, the positive solvatochromic effects of bothnido-compounds and the results of theoretical calculations for theo-carboranyl compounds supported the electronic role of theo-carboranyl unit in each compound. Investigation of the radiative decay mechanism of thecloso- andnido-compounds using their quantum efficiency (Φem) and decay lifetime (τobs) suggested that the ICT-based radiative decay ofnido-compounds occurred more efficiently than the LE-based decay ofcloso-compounds. These results implied that emission from thecloso-compounds was drastically enhanced by the deboronation reaction upon exposure to an increasing concentration of fluoride anions, and finally became similar to the emission color (sky-blue) of thenido-compounds.
View MoreShao Xing Empire Import&Export CO.,ltd
Contact:86-575-82127757
Address:11#, Weiwu Road, Shangyu Industrial Park, Hangzhou Bay, Hangzhou, Zhejiang Province, China
Ji'an Hairui Natural Plant Co. Ltd.
Contact:0796-8105528
Address:Meilin industry park, Qingyuan district Ji'an City, Jiangxi Province
Heliosense Biotechnologies, Inc.
Contact:+86-592-5667290
Address:Xiamen Torch Hi-tech Zone Venture Weiye Building S506
Yicheng Goto Pharmaceuticals Co.,Ltd.
Contact:+86 710 3423122
Address:5th Floor,East Gate of Building #2,Servo-Industrial Park,1st Qilin Road,Xiangyang,Hubei,China
SHANDONG ZHANHUA YONGHAO PHARMACEUTICAL TECH.CO.,LTD
Contact:+86-576-88685096
Address:GENGJU VILLAGE NORTH ONE KILOMETER,ZHANHUA DISTRICT,BINZHOU CITY,SHANDONG PROVINCE,CHINA.
Doi:10.1016/j.poly.2015.01.038
(2015)Doi:10.1080/00397919608003564
(1996)Doi:10.1021/jacs.5b03504
(2015)Doi:10.1021/jo01114a023
(1956)Doi:10.1039/d0gc01123a
(2020)Doi:10.1080/00397910701575855
(2007)