Chemistry - A European Journal p. 18237 - 18247 (2015)
Update date:2022-08-04
Topics:
Chen, Pangkuan
Marshall, Ariel S.
Chi, San-Hui
Yin, Xiaodong
Perry, Joseph W.
J?kle, Frieder
A set of monodisperse bent donor-acceptor-donor-type conjugated borazine oligomers, BnNn+1 (n=1-4), incorporating electron-rich triarylamine donor and electron-deficient triarylborane acceptor units has been prepared through an iterative synthetic approach that takes advantage of highly selective silicon-boron and tin-boron exchange reactions. The effect of chain elongation on the electrochemical, one- and two-photon properties and excited-state photodynamics has been investigated. Strong intramolecular charge transfer (ICT) from the arylamine donors to boryl-centered acceptor sites results in emissions with high quantum yields (Φfl>0.5) in the range of 400-500nm. Solvatochromic effects lead to solvent shifts as large as ?70nm for the shortest member (n=1) and gradually decrease with chain elongation. The oligomers exhibit strong two-photon absorption (2PA) in the visible spectral region with 2PA cross sections as large as 1410GM (n=4), and broadband excited-state absorption (ESA) attributed to long-lived singlet-singlet and radical cation/anion absorption. The excited-state dynamics also show sensitivity to the solvent environment. Electrochemical observations and DFT calculations (B3LYP/6-31G) reveal spatially separated HOMO and LUMO levels resulting in highly fluorescent oligomers with strong ICT character. The BnNn+1 oligomers have been used to demonstrate the detection of cyanide anions with association constants of log K>7.
View MoreYangling Ciyuan biotech Co., Ltd.
Contact:86-15802970736
Address:2-1804, International Park Mansion, No.2, South Fengdeng Road, Lianhu District
Jiangsu Allyrise Pharmaceutical Co., Ltd.(expird)
Contact:+86-523-86818997
Address:Taizhou,Jiangsu Province,CHINA
Suzhou HeChuang Chemical Co.,Ltd.
Contact:+86-512-88800520
Address:No.9 Guanchao Rd,Changshu Advanced Materials Industy Park
Suzhou Time-chem Technologies Co., Ltd.
Contact:0512-63983931/68086856
Address:No. 1326 of Binhe Road, New District, Suzhou, Jiangsu, P. R. China
Contact:86 513 85512619
Address:Rm.1306, Building A, Wenfeng Mansion,168 Gongnong Road, Nantong Jiangsu China
Doi:10.1021/ja01135a038
(1952)Doi:10.1039/c4ob02640c
(2015)Doi:10.1021/jm301166m
(2012)Doi:10.1016/j.tet.2009.09.093
(2009)Doi:10.1021/ja00975a057
(1966)Doi:10.1002/chem.201203405
(2013)