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1.
Three dihydroindolo[2,3-b]carbazole (DDC) donor based organic dyes (DDC6DDC8) with long conjugated systems were successfully synthesized and characterized by optical, electrochemical, computational analysis, and photovoltaic methods. It was found that the elongated π system as well as the high molar extinction coefficients (4.2–5.3 M−1 cm−1) sufficiently reinforced the light harvesting ability with the IPCE response of one dye DDC8 extended to 850 nm, which resulted in large Jsc of these dyes based devices (high as 16.41 mA cm−2). The attached alkyl chains suppress the dark current to some extent, resulting the DDC6 and DDC7 devices in high Voc, while DDC8 displayed low Voc because BTD in DDC8 could attract the iodine ion, which could accelerate the charge recombination. Among the three dyes, DDC7 displayed the best performance with an η value 6.53% under 4 μm thick scattering layer (condition 1+1), which was boosted to 7.49% under 8 μm thick scattering layer (condition 1+2). The photo-stability measurements indicated that all the three dyes are fairly photo-stable.  相似文献   

2.
Novel conjugated macrocycles, thiophene-substituting tetrathia[22]annulenes[2,1,2,1] (TTAs, and 5b), were synthesized through a convenient four-step procedure. They were evidenced to have high aromaticity by NMR, UV–vis absorption spectra, and calculation. Their UV–vis absorption spectra, thermal stability, electrochemical properties, thin film morphology were studied and the field-effect transistors based on 5a and 5b through a vapor deposition method performed good with reproducible bulk-like carrier mobilities (as high as 0.53 cm2 V−1 S−1) and high on/off ratios (as high as 9.0×105), which was among the best records in this series.  相似文献   

3.
In this paper, by introducing [1,2,5]thiadiazolo[3,4-c]pyridine (PT) as an auxiliary acceptor into the molecular design of organic sensitizers, we have synthesized four new dyes (PT1PT4) for dye-sensitized solar cells (DSSCs) with triphenylamine or N,N-diphenylthiophen-2-amine as the donor units and thiophene or benzene as the π-bridges, respectively. All the structures, optical and electrochemical properties were fully characterized. Nanocrystalline TiO2 dye-sensitized solar cells were also fabricated using these dyes. Among them, PT2-based DSSCs showed the highest overall conversion efficiency of 6.11% with Voc=668 mV, Jsc=12.61 mA cm−2 and a fill factor (FF)=0.74 after a chenodeoxycholic acid (CDCA) treatment under standard illumination condition (100 mW cm−2 simulated AM 1.5 solar light).  相似文献   

4.
A new D-π-A dimesitylboron derivative with terminal phenothiazine bridged by fluorenevinyl (PFTB) has been synthesized. It was found that PFTB could selectively recognize fluoride and cyanide anions by naked eyes. Upon addition of F and CN, the color of the solution of PFTB in DCM turned to yellowish-green from yellow and strong green emitting was observed under UV light, while the emission of PFTB in DCM was weak. Moreover, the presence of 10 equiv of tetrabutylammonium salts of other anions, such as Cl, Br, I, AcO, HSO4, H2PO4, could not lead to obvious changes of the UV–vis absorption and the fluorescent emission spectra of PFTB. The detection limits of PFTB towards F and CN were 7.52×10−8 mol/L and 6.12×10−8 mol/L in DCM, respectively. Therefore, the D-π-A type triarylborane derivatives can be used as ‘turn on’ fluorescent sensors for detecting F and CN.  相似文献   

5.
New donor–π–acceptor organic dyes K-1 and K-2 containing thieno[2,3-a]carbazole as an electron donor were designed and synthesized for dye-sensitized solar cells (DSCs). Photophysical and electrochemical properties of K-dyes were investigated. DSCs based on K-dyes showed a high conversion efficiency of 6.6–6.7% with a Jsc of 12.40–12.49 mA cm−2 and a Voc of 0.70–0.71 V. The molecular geometry calculation indicated that the existence of thienocarbazole donor in K-dyes enhanced the molecular planarity compared to the carbazole analogue dye MK-3. As a result, DSCs based on K-dyes showed high IPCEs, perhaps due to efficient intramolecular charge transfer and electron injection from excited dye to TiO2 conduction band.  相似文献   

6.
A simple fluorescent probe, which contains rhodamine and aminoquinoline moieties, was designed and prepared for selective detection of Hg2+ in acetonitrile. RbQ exhibited high selectivity and sensitivity toward Hg2+ over other common metal ions. The recognition of RbQ toward Hg2+ can be detected by fluorescence spectra, absorption spectra, and even by naked eyes. The binding ratio of the RbQ–Hg2+ complex was found to be 1:1 according to Job plot experiment, and the limit of detection was 1.05×10−7 M. Moreover, the prepared complex RbQ–Zn2+ (RbQZ) could detect Hg2+ in a ratiometric way and showed lower limit of detection (2.95×10−8 M) than RbQ in the same condition. Finally, we also demonstrated that the aminoquinoline–zinc complex could be served as a new and effective FRET donor for rhodamine derivatives.  相似文献   

7.
A new colorimetric and fluorogenic probe (RN3) based on rhodamine-B has been successfully designed and synthesized. It displays a selective response to Hg2+ in the aqueous buffer solution over the other competing metals. Upon addition of Hg2+, the solution of RN3 exhibits a ‘naked eye’ observable color change from colorless to red and an intensive fluorescence with about 105-fold enhancement. The changes in the color and fluorescence are ascribed to the ring-opening of spirolactam in rhodamine fluorophore, which is induced by a binding of the constructed receptor to Hg2+ with the association and dissociation constants of 0.22 × 105 M−1 and 25.2 μM, respectively. The Job's plot experiment determines a 1:1 binding stoichiometry between RN3 and Hg2+. The resultant “turn-on” fluorescence in buffer solution, allows the application of a method to determine Hg2+ levels in the range of 4.0–15.0 μM, with the limit of detection (LOD) calculated at 60.7 nM (3σ/slope). In addition, the fluorescence ‘turn-off’ and color ‘fading-out’ happen to the mixture of RN3-Hg2+ by further addition of I or S2−. The reversible switching cycles of fluorescence intensity upon alternate additions of Hg2+ and S2− demonstrate that RN3 can perform as an INHIBIT logic gate. Furthermore, the potential of RN3 as a fluorescent probe has been demonstrated for cellular imaging.  相似文献   

8.
The metal-organic frameworks (three-dimensional porous coordination polymers) [Zn4O(Me4BPDC)3] × 9 DMF, 2 · 9 DMF and [Cu2(Me4BPDC)2] × 9 DMF, 3 · 9 DMF are representatives of the classical Zn-IRMOF series and Cu paddle-wheel complexes with H2Me4BPDC = 2,2′,6,6′-tetramethyl-4,4′-biphenyldicarboxylic acid, 1. The dicarboxylate linker of 1 is a representative of the non-planar biphenyl ligand family, known as an efficient scaffold for chiral molecules. There is a 90° twist angle between the phenyl rings in 1, dictated by the methyl groups, which leads to assembly of doubly interpenetrated pcu-a (in 2) and nbo-a (in 3) nets under low temperature solvothermal conditions in dimethylformamide (DMF). Activation by degassing (to yield 2), exchange with methanol or tetrahydrofuran and subsequent evacuation at elevated temperatures (to yield 3I) gave materials with BET surface areas of 1735 m2/g (2) and 1041 m2/g (3I). Adsorbed quantities of H2 were 1.26 wt% (2) and 1.02 wt% (3I) (77 K, 1 bar), CO2 30.8 cm3/g (2) and 50 cm3/g (3I) (273 K, 1 bar) and CH4 12.9 cm3/g (2) and 11.4 cm3/g (3I) (273 K, 1 bar). The H2 and CO2 sorption values for 2 are similar to those of MOF-5 (IRMOF-1) with its almost doubled BET surface area. An increase is found concerning the adsorbed amounts of N2, H2, and CO2 for 3I compared to related doubly interpenetrated nbo-a-type MOF-601, MOF-602, MOF-603 ([Cu2L2] with L = 2,2′-R2-4,4′-biphenyldicarboxylate, R = CN, Me, I, respectively).  相似文献   

9.
Anthracene-based small molecules incorporating an electron accepting tricyanovinyl (TCV) group was prepared to investigate the linkage position influences of the anthracene and TCV groups on the opto-electrical and photovoltaic properties of the molecules. The maximum absorptions of the anthracene-based molecules incorporating the TCV group at the phenyl group of the triphenylamine unit (TCV-TpaA9,10T, TCV-TpaTA9,10T, and TCV-TpaA2,6T) or at the thiophene unit (TpaA9,10T-TCV, TpaTA9,10T-TCV, and TpaA2,6T-TCV) were found to be dependent on the linkage position of the anthracene unit. The HOMO energy levels of the molecules containing TCV group at the phenyl group of the triphenylamine unit were deeper than those of the molecules containing TCV group at the thiophene unit. The solution processed small molecule organic solar cells (SMOSCs) prepared with the structure of ITO/PEDOT:PSS/TCV-TpaA9,10T or TCV-TpaA2,6T or TpaA2,6T-TCV:PC71BM (2:1 wt %)/LiF/Al exhibited a maximum energy conversion efficiency of 1.04%, 1.67%, and 1.95%, respectively, under AM 1.5 irradiation (100 mW cm−2).  相似文献   

10.
Chemosensor based on Schiff base molecules (1, 2) were synthesized and demonstrated the selective fluoro/colorimetric sensing of multiple metal ions (Mn2+, Zn2+ and Cd2+) in acetonitrile–aqueous solution. Both 1 and 2 showed a highly selective naked-eye detectable colorimetric change for Mn2+ ions at 10−7 M. Fluorescence sensing studies of 1 and 2 exhibited a strong fluorescence enhancement (36 fold) selectively upon addition of Zn2+ (10−7 M, λmax = 488 nm). Fluorescence titration and single crystal X-ray analysis confirmed the formation of 1:1 molecular coordination complex between 1 and Zn2+. Interestingly, a rare phenomenon of strong second turn-on fluorescence (190 fold, λmax = 466 nm) was observed by the addition of Cd2+ (10−7 M) into 1 + Zn2+ or Zn2+ (10−7 M) into 1 + Cd2+. Importantly both 1 and 2 exhibited different fluorescence λmax with clearly distinguishable color for both Zn2+ and Cd2+.  相似文献   

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