Synthesis and electrochemical characterization of BODIPY dyes bearing polymerizable substituents
作者:Zekeriya Biyiklioglu、Turgut Keleş
DOI:10.1016/j.ica.2017.05.051
日期:2017.9
A novel series of 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) dyes bearing polymerizable 4-morpholin-4-yl-benzyl and 4-(dimethylamino)-1-naphthyl groups were synthesized for the first time and further functionalized in a Knoevenagel condensation reaction with 4-(dimethylamino)-1-naphthaldehyde and 4-morpholin-4-ylbenzaldehyde. The identity of BODIPY dyes 1, 2, 4 were confirmed by H-1 NMR, C-13 NMR, FT-IR, UV-Vis and mass spectrometry. Electrochemical characterizations of boron dipyrromethene dyes were carried out with voltammetric measurements. While the 4-morpholin-4-ylbenzyl and 4-(dimethylamino)-1-naphthyl groups substituted BODIPY dyes 1, 2, 3 and 4 gave common reduction reactions during the cathodic potential scans, BODIPY dyes 1, 2, 3 and 4 were electropolymerized on the working electrode. (C) 2017 Elsevier B.V. All rights reserved.
Modifying the meso-phenyl with electron donating amino groups strongly enhances BODIPY's ability as good singlet oxygen photosensitizer
correlated with singletoxygen formation efficiency. The results are explained by PCT (photoinduced charge transfer) mechanism. The presence of the methyl groups at 1 and 7 positions disables the rotation of the phenyl ring, and therefore, the corresponding BODIPY 1a, 2a, and 3a were characterized by significant highersingletoxygen generation efficiency and fluorescencequantumyieldthan that of BODIPY