Donor‐Acceptor Molecule Based High‐Performance Photothermal Organic Material for Efficient Water Purification and Electricity Generation

Abstract

In this contribution, a unique donor-acceptor conjugated organic-small-molecule photothermal material, namely GDPA-QCN, is presented. Bulky dendritic triphenylamine (GDPA) was grafted onto quinoxaline-6,7-dicarbonitrile (QCN) with a phenyl ring as a bridge to form an "umbrella" architecture. Benefited from the particular molecular structure, in solid state, GDPA-QCN molecules adopted a loose packing mode due to the steric effect of "umbrella head" dendritic triphenylamine and flexible molecular structure feature, which allows efficient intramolecular motions and consequently elevates energy dissipation by taking the pathway of thermal deactivation within broad absorption range. The GDPA-QCN solid has high solar-thermal conversion efficiency with an absorption range from 300 to 1100 nm, which can promote superior water purification and electricity generation performance.

Construction of Donor–Acceptor Heteroporous Covalent Organic Frameworks as Photoregulated Oxidase-like Nanozymes for Sensing Signal Amplification

“…Covalent organic frameworks (COFs) are a class of metal-free crystalline porous materials that allow the precise integration of organic molecular building units into networks by strong covalent bonds . By virtue of design-ability, topology and unit diversity, and porosity and stability, COFs have attracted promising potential for a range of applications. , Credited with the predesignable nature of COFs, their light-harvesting and charge-transport properties can be triggered by introducing a functional group into periodic backbones and built-in pores. − In particular, the incorporation of donor–acceptor (D–A) units into two-dimensional (2D) COF systems has been demonstrated to be an effective strategy to facilitate high charge transfer mobility and regulate the band gap and energy levels to increase visible light adsorption. , Taking advantage of the extended π-electron conjugation and highly ordered D–A structure, functional D–A COFs have shown great potential in organic photovoltaics (OPV), electrochemiluminescence (ECL), photoconductive devices, lightfilter, photodetectors, and photocatalysis. − However, to date, the light-driven oxidase-like activity of D–A heteroporous COFs has rarely been explored.…”

“…23−25 In particular, the incorporation of donor−acceptor (D−A) units into two-dimensional (2D) COF systems has been demonstrated to be an effective strategy to facilitate high charge transfer mobility and regulate the band gap and energy levels to increase visible light adsorption. 26,27 Taking advantage of the extended π-electron conjugation and highly ordered D−A structure, functional D− A COFs have shown great potential in organic photovoltaics (OPV), 28 electrochemiluminescence (ECL), 23 photoconductive devices, 29 lightfilter, 30 photodetectors, 31 and photocatalysis. 32−34 However, to date, the light-driven oxidase-like activity of D−A heteroporous COFs has rarely been explored.…”

A three-dimensional arched solar evaporator based on hydrophilic photothermal fibers inspired by hair for eliminating salt accumulation with desalination application

“…Currently, research scientists have developed many excellent solar steam generation devices [12][13][14] based on metal-based inorganic materials, [15][16][17][18] carbon-based inorganic materials, [19][20][21][22] organic-inorganic hybrid materials, [23][24][25] polymeric materials, [26][27][28][29] organic co-crystals materials, 30 purely organic smallmolecule materials [31][32][33][34][35] and other photothermal nanomaterials 36,37 as solar heaters, but most of them possess complicated preparation processes and photobleaching problems. More importantly, improving the water evaporation rate is as important as paying attention to the ability of the device to discharge salt in the solar evaporation research concept.…”

Synthesis, optical and electrochemical properties of (D–π)2-type and (D–π)2Ph-type fluorescent dyes

“…The design and development of a new type of organic fluorescent dyes have been of considerable scientific and practical concern with the objective of not only fundamental studies [1][2][3][4][5][6][7][8][9][10][11][12][13] in synthetic chemistry, electrochemistry and photochemistry, but also their potential applications to emitters for optoelectronic devices, such as organic light-emitting diodes (OLEDs) [14][15][16][17][18][19][20][21][22], as well as fluorescent probes [23][24][25][26][27][28] for bioimaging and fluorescent sensors for specific target species [29][30][31][32]. Among many kinds of organic fluorescent dyes, much efforts have been made on the development of donor-π-acceptor (D-π-A)-type fluorescent dyes constructed of an electron-donating moiety (D) and an electron-withdrawing moiety (A), linked by a π-conjugated unit thanks to their intense photoabsorption and fluorescence emission characteristics originating from the intramolecular charge transfer (ICT) excitation from the D to the A moiety [4][5][6][7][8][9][18][19][20]25,…”

“…The design and development of a new type of organic fluorescent dyes have been of considerable scientific and practical concern with the objective of not only fundamental studies [ 1 – 13 ] in synthetic chemistry, electrochemistry and photochemistry, but also their potential applications to emitters for optoelectronic devices, such as organic light-emitting diodes (OLEDs) [ 14 – 22 ], as well as fluorescent probes [ 23 – 28 ] for bioimaging and fluorescent sensors for specific target species [ 29 – 32 ]. Among many kinds of organic fluorescent dyes, much efforts have been made on the development of donor–π–acceptor (D–π–A)-type fluorescent dyes constructed of an electron-donating moiety (D) and an electron-withdrawing moiety (A), linked by a π-conjugated unit thanks to their intense photoabsorption and fluorescence emission characteristics originating from the intramolecular charge transfer (ICT) excitation from the D to the A moiety [ 4 – 9 18 – 20 25 – 26 ]. Furthermore, the (D–π–) 2 A-type fluorescent dyes with two D–π moieties have recently been stimulating intensive research efforts because of their high molar extinction coefficients and fluorescence quantum yields, compared to those of D–π–A-type fluorescent dyes [ 10 – 13 21 – 22 27 – 28 32 ].…”