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Four asymmetric bis-branched triphenylamine-cored compounds with different electron-withdrawing groups have been synthesized and their optical properties have been systematically investigated. The two-photon absorption cross-section ( σ 2PA ) values were measured by two-photon excited fluorescence which revealed that the four compounds possessed large σ 2PA values from 2011 to 4173 GM in the near-infrared region. Theoretical calculations revealed that the compounds were all provided with interesting intramolecular charge transfer generated from one branch to the other which contributed to the large σ 2PA values. Cytotoxicity tests indicated that all these compounds had good biocompatibility for living cells, both one- and two-photon fluorescence microscopy studies showed the potential application of the four new compounds in cell imaging due to the large σ 2PA and appropriate biocompatibility. [ABSTRACT FROM AUTHOR]

Six multi-branched compounds ( 1 – 6 ) were conveniently synthesized through condensation reaction, and characterized by 1 H NMR, 13 C NMR, MS and single crystal X-ray diffraction. One-, two-photon absorption and emission properties were studied and theoretical calculations were applied to investigate the structure–property relationships, which showed that all the six compounds possessed good two photon absorption (2PA) properties. Their 2PA cross sections increased with the isophorone's branch number, the highest 2PA cross-section was 9398.23 GM for 6 in 1, 4-dioxane. Cytotoxicity tests indicated that all these compounds had good biocompatibility for living cells, bio-imaging studies highlighted the potential application of compounds 1 , 2 , 4 and 6 in both one- and two-photon fluorescence microscopy imaging domains. [ABSTRACT FROM AUTHOR]

Six new benzoxazole-based compounds 1–6 of the donor-bridge-accepter (D-π-A) type with different anions were obtained by methylation and anion exchange reaction. The single crystals of 1 , 3 and 6 were obtained by slow evaporation of acetonitrile and determined by X-ray crystallography. Ellipsoidal structures of the three compounds showed that the cationic parts all maintained good planarity, which was beneficial for two-photon absorption (2PA) properties and accorded with the results of two-photon excited fluorescence tests. Biological imaging experiments showed water-soluble six compounds had excellent penetrability in living cells and could located in cytoplasm in one- and two-photon cell imaging. Biological imaging result of compound 6 was more excellent than other compounds, which indicated synergy of anions and cations played a very important role in cell imaging. [ABSTRACT FROM AUTHOR]