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In this work, a variety of new conjugated chromophores containing imino and hydroxyl groups are presented. Excited state intramolecular proton transfer (ESIPT) of these chromophores under one- and two-photon irradiation was surveyed. One-photon absorption spectra show the presence of internal hydrogen bond in the organic dyes containing ortho-hydroxyl group, while the corresponding dyes carrying para-hydroxyl...
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