Electroactive Dyes Based on 1,8‐Naphthalimide with Acetylene Linkers as Promising OLED Materials – the Relationship Between Structure and Photophysical Properties
Electroactive Dyes Based on 1,8‐Naphthalimide with Acetylene Linkers as Promising OLED Materials – the Relationship Between Structure and Photophysical Properties
water‐soluble dendritic structure was then synthesized by using the pendant moieties as starting points for the construction of dendritic branches. We show that the polarity of the environment significantly modulates both the fluorescence and the TPA responses of the different chromophoric derivatives. This extends to more subtle effects that involve phenol pendant moieties that were found to act as
Two ratiometric two-photon pH probes were designed, combining pKa values close to physiological pH and large two-photon absorption responses. They are able to stain efficiently GUV and cell membranes.
Optical electron transfer through 2,7-diethynylfluorene spacers in mixed-valent complexes containing electron-rich “(η2-dppe)(η5-C5Me5)Fe” endgroups
作者:Floriane Malvolti、Cedric Rouxel、Olivier Mongin、Philippe Hapiot、Loic Toupet、Mireille Blanchard-Desce、Frédéric Paul
DOI:10.1039/c1dt10231a
日期:——
We report in this communication the study of the intramolecular electrontransfer through a 2,7-diethynylfluorenyl spacer in the Fe(II)/Fe(III) mixed-valent (MV) complex [(η2-dppe)(η5-C5Me5)FeCC(2,7-C21H24)CCFe(η5-C5Me5)(η2-dppe)][PF6] (1[PF6]). The complex is generated in situ by comproportionation from its homovalent dinuclear Fe(II) and Fe(III) parents (1 and 1[PF6]2). It is shown that electronic
Two novel chiral fluorescence polymers P-1 and P-2 incorporating (R,R)-salen-based binuclear boron complex in the main chain backbone were synthesized by (R,R)-salen-based boron complex (M-1) with 9,9-dibutyl-2,7-diethynyl-9H-fluorene (M-2) and 1,4-dibutoxy-2,5-diethynylbenzene (M-3) via Pd-catalyzed Sonogashira coupling reaction, respectively. The chiral polymers were characterized by H-1 NMR, UV-vis spectroscopy, photoluminescence (PL), gel permeation chromatography (GPC), TGA, DSC, cyclic voltammetry (CV), and theoretical calculation using density-functional theory (DFT) method. P-1 and P-2 show anisotropic fluorescence property with emission spectral maxima at 474 nm and 514 nm, respectively. Both two chiral polymers can exhibit high fluorescence quantum yields (up to 44% and 52%) with large Stokes shifts over 90 nm. The DFT theoretical calculation of the polymer repeating units indicates that the optical band gaps of P-1 is higher than that of P-2, which was consistent with the CV determination results. (C) 2012 Elsevier Ltd. All rights reserved.