39095-25-5Relevant articles and documents
Dithia[3.3]paracyclophane Core: A Versatile Platform for Triplet State Fine-Tuning and Through-Space TADF Emission
Auffray, Morgan,Kim, Dae Hyeon,Kim, Jong Uk,Bencheikh, Fatima,Kreher, David,Zhang, Qisheng,D'Aléo, Anthony,Ribierre, Jean-Charles,Mathevet, Fabrice,Adachi, Chihaya
, p. 1921 - 1925 (2019)
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
Linear and V-shaped carbazole-based molecules functionalized by cyano acceptors and diversified donors: Synthesis, single- and two-photon related photophysical properties
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
, p. 200 - 211 (2019/02/25)
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).
Preparation method of two-photon fluorescence pH probe and application in cell imaging thereof
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Paragraph 0041; 0044; 0045, (2018/09/12)
The invention belongs to the technical field of fine chemical engineering, and particularly relates to a preparation method of a two-photon fluorescence pH probe and application in cell imaging thereof. The probe is prepared by taking dicyan-biphenyl-ethylene as a matrix, and comprises carbazolyl, di-cyano and n-octyl. Because the molecular structure of the probe has a longer flexible chain, the lipophicity is stronger, the probe can penetrate a cell wall (or cell membrane) into a cell to stain the cell for detecting the pH in the cell; the molecular structure of the probe belongs to D-pi-A type molecules, the two-photon absorption cross section (delta) is improved, so that the probe has higher imaging definition and resolution; in addition, the probe has a large Stokes shift in the marking process, thereby greatly improving the imaging accuracy and precision; the fluorescence quantum yield (phi) of the probe in a solvent is higher, the two-photon emission cross section is larger, so that the higher the brightness of the imaging is, the clearer the image is, and the higher the resolution is.