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• W2071040138 endingPage "9321" @default.
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• W2071040138 abstract "The photophysical, photochemical, two-photon absorption (2PA) and metal ion sensing properties of a new fluorene derivative (E)-1-(7-(4-(benzo[d]thiazol-2-yl)styryl)-9,9-bis(2-(2-ethoxyethoxy)ethyl)-9H-fluoren-2-yl)-3-(2-(9,10,16,17,18,19,21,22,23,24-decahydro-6H dibenzo[h,s][1,4,7,11,14,17]trioxatriazacycloicosin-20(7H)-yl)ethyl)thiourea (1) were investigated in organic and aqueous media. High sensitivity and selectivity of 1 to Zn(2+) in tetrahydrofuran and a water/acetonitrile mixture were shown by both absorption and fluorescence titration. The observed complexation processes corresponded to 1:1 stoichiometry with the range of binding constants approximately (2-3) x 10(5) M(-1). The degenerate 2PA spectra of 1 and 1/Zn(2+) complex were obtained in the 640-900 nm spectral range with the maximum values of two-photon action cross section for ligand/metal complex approximately (90-130) GM, using a standard two-photon induced fluorescence methodology under femtosecond excitation. The nature of the 2PA bands was analyzed by quantum chemical methods and a specific dependence on metal ion binding processes was shown. Ratiometric fluorescence detection (420/650 nm) provided a good dynamic range (10(-4) to 10(-6) M) for detecting Zn(2+), which along with the good photostability and 2PA properties of probe 1 makes it a good candidate in two-photon fluorescence microscopy imaging and sensing of Zn ions." @default.
• W2071040138 created "2016-06-24" @default.
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• W2071040138 date "2010-06-30" @default.
• W2071040138 modified "2023-09-26" @default.
• W2071040138 title "Fluorene-Based Metal-Ion Sensing Probe with High Sensitivity to Zn²⁺ and Efficient Two-Photon Absorption" @default.
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• W2071040138 doi "https://doi.org/10.1021/jp104450m" @default.
• W2071040138 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2913098" @default.
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• W2071040138 hasPublicationYear "2010" @default.
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