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  • Title: Acetylene-substituted two-photon absorbing molecules with rigid elongated pi-conjugation: synthesis, spectroscopic properties and two-photon fluorescence cell imaging applications.
    Author: Liu B, Zhang HL, Liu J, Huang ZL, Zhao YD, Luo QM.
    Journal: J Fluoresc; 2007 Sep; 17(5):573-9. PubMed ID: 17593326.
    Abstract:
    Two asymmetrical molecules with substituted acetylene as central rigid elongated conjugation are reported as potential chromophores for two-photon microscopic imaging. These molecules consist of a typical D-pi-A structure, have different donors (D), the same pi-conjugated center (pi) and the same acceptor (A). Structural characterization and spectroscopic properties, including single-photon (linear) absorption, quantum yields, single-photon fluorescence, and two-photon absorption spectra, were studied in solvents with different polarity. These acetylene-substituted molecules were found to have high two-photon absorption cross-sections (for example, 690 GM for molecule 1 in toluene), which were determined by a two-photon induced fluorescence method using a femtosecond Ti: sapphire laser as excitation source. Single- and two-photon cellular imaging experiments demonstrate that the substituted acetylene derivatives could be one kind of promising two-photon fluorescence probes for cellular imaging.
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