- Linear and V-shaped carbazole-based molecules functionalized by cyano acceptors and diversified donors: Synthesis, single- and two-photon related photophysical properties
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A series of novel linear and V-shaped carbazole-based molecules functionalized by cyano acceptors and diversified donors (carbazole, diphenylamino, dimethylamino, methoxy, and ferrocene) were synthesized and characterized by hydrogen-1 nuclear magnetic resonance, carbon-13 nuclear magnetic resonance, Fourier transform infrared spectroscopy, and high-resolution mass spectrometry. Their linear and nonlinear optical properties including UV–visible absorption, single-photon excited fluorescence, two-photon absorption, and frequency up-converted fluorescence, were systematically investigated in various solvents. The time-resolved photoluminescence studies using time-correlated single photon counting revealed their fluorescence lifetimes in THF. The solvent polarity exerts little effect on their absorption properties, while the emission properties (maximum fluorescence wavelength, Stokes shift, fluorescence quantum yield) display solvent polarity dependencies. Donor-acceptor functionalities and molecular dimensionality are considered to be the crucial structural factors that influence their optical properties. Pumped by a femtosecond laser (690–990 nm, 80 MHz, 140 fs), all the target molecules emit intense frequency up-converted fluorescence except FC1 and FC2 which contain one or two ferrocene donors. The two-photon absorption cross-sections in THF are in the range of 631–3014 GM. The density functional theory calculations were also conducted to unravel their electronic structures and to further understand the structure-property relationships. To our knowledge, this study is the first to be concerned with the single- and two-photon related photophysical properties of these D-π-A-π-D′ and D′-π-A-π-D-π-A-π-D′ carbazole-based molecules (D = donor, A = acceptor, π = conjugated bridge).
- Cai, Zhi-Bin,Liu, Shuang-Shuang,Li, Bo,Dong, Qi-Ji,Liu, Zi-Long,Zheng, Min,Li, Sheng-Li,Tian, Yu-Peng,Chen, Li-Jun,Ye, Qing
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p. 200 - 211
(2019/02/25)
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- Dithia[3.3]paracyclophane Core: A Versatile Platform for Triplet State Fine-Tuning and Through-Space TADF Emission
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Thermally activated delayed fluorescence (TADF) based on through-space donor and acceptor interactions constitute a recent and promising approach to develop efficient TADF emitters. Novel TADF isomers using a dithia[3.3]-paracyclophane building block as a
- Auffray, Morgan,Kim, Dae Hyeon,Kim, Jong Uk,Bencheikh, Fatima,Kreher, David,Zhang, Qisheng,D'Aléo, Anthony,Ribierre, Jean-Charles,Mathevet, Fabrice,Adachi, Chihaya
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p. 1921 - 1925
(2019/05/10)
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- Open-Chain Crown-Ether-Derived Two-Photon Fluorescence Probe for Real-Time Dynamic Biopsy of Mercury Ions
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A novel two-photon fluorescence probe for Hg2+ derived from bis(styryl)terephthalonitrile, as a two-photon fluorophore, and bis[2-(2-hydroxyethyl sulfanyl) ethyl]amino group (ionophore), as a novel Hg2+ ligand, was developed. The probe possesses small molecule size, large two-photon absorption cross-section (1067 GM) in H2O, non-cytotoxic effect, long wavelength emission at 588nm, large Stokes shift (121nm), excellent photostability, high water solubility, good cell permeability, and pH insensitivity in the biologically relevant range. The probe can selectively detect Hg2+ ions in live cells and living tissues without interference from other metal ions and the membrane-bound probes, and its quenching constant is 8.73×105 M-1.
- Huang, Chibao,Zhang, Daohai,Qu, Junle,Liu, Xiaonan,Zhao, Guanglian,Yuan, Tingxiang,Liu, Yang
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p. 705 - 711
(2017/05/31)
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- Cell in the mercury ion detection and for developing diphenyl ethylene bis-cyano benzene pair photon fluorescent probe
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The invention relates to a diphenylethene group dual cyano benzene two-photon fluorescence probe for detecting and displaying intracellular Hg ions, and the probe is prepared by performing nucleophilic substitution on mercaptoethanol and 2,5-di(4-[di(2-chloroethyl)amino]styryl)para-phthalonitrile. Laser excitation of 810nm can avoid photoinduced toxicity of cells. In a range of pH being 4.5-13, the probe has good selectivity on the Hg ions, and Na, K, Ca, Mg and Mn ions have no interference with detection, and the Hg ions of micro molarity can be detected. Fluorescence intensity is reduced after complexing of probe molecules and the Hg ions, and the content of the Hg ions can be subjected to two-photon fluorescence detection. A two-photon fluorescence microimaging experiment shows that the probe has good permeability on fibroblasts and other cells, has no toxic or side effects on the cells and is particularly suitable for the detection of intracellular Hg ion concentration change and Hg ion distribution.
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- Electrochromic compounds, electrochromic composition, and a display element
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PROBLEM TO BE SOLVED: To provide an electrochromic compound and electrochromic composition which show sharp light absorption spectral characteristics in color development, and present yellow based, cyan based, and black based color developments, and to provide a display element using the electrochromic compound or electrochromic composition. SOLUTION: The electrochromic compound is represented by formula (1). In the formula (1), X1, X2, X3, and X4each independently denote a hydrogen atom or a monovalent substituent, n denotes the integer of 1 to 6, Rs each independently denote a monovalent substituent, and Ar denotes a benzene ring which may have a substituent when n is from 1 to 5, and only a benzene ring when n is 6, and A-denotes a monovalent anion. COPYRIGHT: (C)2011,JPOandINPIT
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Paragraph 0151-0152
(2016/10/10)
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- Study of the interaction between 2,5-di-[2-(4-hydroxy-phenyl)ethylene]- terephthalonitril and bovine serum albumin by fluorescence spectroscopy
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A new compound, 2,5-di-[2-(4-hydroxy-phenyl)ethylene]-terephthalonitrile (DHPEPN), was synthesized. The interaction between bovine serum albumin (BSA) and DHPEPN in Tris-HCl buffer solution (pH 7.4) was investigated using fluorescence and UV-vis absorption spectroscopy. The mechanism of BSA fluorescence quenched by DHPEPN is discussed according to the Stern-Volmer equation. The binding constant and the thermodynamic parameters ΔH, ΔS, ΔG at different temperatures were calculated. The results indicate that the van der Waals interaction and hydrogen bonding play major roles in the binding process. The distance between BSA and DHPEPN is estimated to be 3.59 nm based on the Fo?rster resonance energy transfer theory. The spectral changes of synchronous fluorescence and three-dimensional fluorescence suggest that both of the microenvironment of DHPEPN and the conformation of BSA are changed during binding between DHPEPN and BSA.
- Zhang, Li-Na,Wu, Fang-Ying,Liu, Ai-Hong
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- Red light emitting compounds for organic electroluminescent devices and organic electroluminescent devices using them
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The present invention relates to red color emitting compounds for an organic electroluminescent device (OELD), particularly to red color emitting compounds represented by the following formula (1) having high luminescence efficiency and enhanced thermal-s
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- Bis(aminostyryl)benzene compounds and synthetic intermediates thereof, and process for preparing the compounds and intermediates
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To provide compounds, which are suitable for use as an organic luminescent material capable of developing intense luminescence which is yellow to red, and a process for preparing in general and high efficiency. A bis(aminostyryl)benzene compound of the following general formula [I] is provided wherein R2and R3independently represent an unsubstituted aryl group, and R1and R4independently represent an aryl group, and R5to R8, independently represent a cyano group or the like. A process for the preparation thereof is described wherein a 4-(N,N-diarylamino)benzaldehyde and a diphosphonic acid ester or diphosphonium are subjected to condensation reaction. Intermediates of the bis(aminostyryl)benzene compound are also described.
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- A novel series of copolymers containing 2,5-dicyano-1,4- phenylenevinylene - Synthetic tuning of the HOMO and LUMO energy levels of conjugated polymers
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A series of copolymers of 2,5-dicyano-1,4-phenylenevinylene and 2- methoxy-5-(2'-thylhexyloxy)-1,4-phenylenevinylene were synthesized by Wittig reaction. The HOMO and LUMO energy levels of copolymers can be easily tuned by controlling the feed ratio of co
- Xiao,Yu,Chua,Huang
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p. 1318 - 1321
(2007/10/03)
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