Multifunctional AIE-active polymers containing TPA-TPE moiety for electrochromic, electrofluorochromic and photodetector

Controlled Synthesis of Nitro-Terminated Poly[2-(3-thienyl)-ethanol]/g-C3N4 Nanosheet Heterojunctions for Efficient Visible-Light Photocatalytic Hydrogen Evolution

“…To reveal the essential causes of the enhanced H 2 production performance of the PTEtOH/CN nanosheet heterojunction, it is imperative to explore the carrier transfer and separation mechanism. From the UV-vis DRS spectra (Figure S7 in the Supporting Information), it clearly shows that 2.70 and 2.09 eV are the optical energy gap ( E g ) of CN and PTEtOH, respectively, corresponding to the optical absorption thresholds of ∼460 and 590 nm, according to the equation , Based on the optical absorption thresholds, the wavelength-dependent photocurrent action spectra were investigated for 5PTEtOH/CN and CN, as displayed in Figure c. By comparison, the photocurrent density of CN begins to become large with the decrease of the irradiation wavelength from 460 nm to 400 nm, while 5PTEtOH/CN also exhibits the enhanced photocurrent density from 590 nm to 460 nm, which is usually accepted as the visible photosensitization from PTEtOH, since, in this situation, only PTEtOH is excited and its photogenerated electrons could transfer to CN.…”

Aggregation-Induced Emission Properties in Fully π-Conjugated Polymers, Dendrimers, and Oligomers

“…A derivative analogous to compound 65 has been described as a mercury ion turn-on fluorescent sensor [ 117 ]. In a very similar manner, Wang et al took advantage of the AIE properties of TPE and TPA to prepare multifunctional electrochromic materials ( 69 – 72 ) [ 118 ]. They synthesized a series of polymers by Stille coupling reaction in good yields, high molecular weights and good PDI ( Figure 28 ).…”

“Colorless-to-Black” Electrochromic and AIE-Active Polyamides: An Effective Strategy for the Highest-Contrast Electrofluorochromism

“…41 However, owing to the unsymmetrical coupling, the resulting TPE derivatives are normally mixtures of E and Z isomers, which are difficult to separate because of their similar polarity. 18,31,42 An effective method reported by Tang et al was attaching polar units to the TPE structure to increase the polarity difference. 43 The separated E and Z isomers exhibited different photophysical properties, highlighting the importance of separating E/Z isomers of TPE when studying TPE derivatives.…”

“…Although a few EFC polymers have been reported, designing suitable EFC polymers that offer high fluorescence contrast, rapid switching speed, long-term stability, as well as low-cost production remains a great challenge. Significant efforts are being made to develop EFC polymers with improved performances, especially regarding the high fluorescence on/off contrast. − In general, the fluorescence contrast mainly depends on the quenching effect and the intrinsic fluorescence intensity of the EFC polymers. To realize an effective fluorescence quenching, a large overlap between the emission band and the new absorption band of a fluorescence monitor, usually a redox-active electrochromic (EC) unit, is crucial .…”

“…In this context, to circumvent the problems of the weak fluorescence resulting from the ACQ (aggregated-caused quenching) effect, we have recently adopted a AIE (aggregated-induced emission) functionalization strategy by incorporating a TPE unit into the electrochromic polymers and demonstrated high contrast EC/EFC dual-switching properties. , TPE is a typical AIE unit, and usually synthesized by McMurry coupling . However, owing to the unsymmetrical coupling, the resulting TPE derivatives are normally mixtures of E and Z isomers, which are difficult to separate because of their similar polarity. ,, An effective method reported by Tang et al was attaching polar units to the TPE structure to increase the polarity difference . The separated E and Z isomers exhibited different photophysical properties, highlighting the importance of separating E/Z isomers of TPE when studying TPE derivatives. , Given the high on/off contrast in the TPE-based EFC switching systems, a rational design by combinations of “colorless-to-black” electrochromism and AIE-active TPE unit is expected to further improve the EFC contrast ratio.…”