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The biexponential fluorescence decay of (S)-1 can be interpreted as follows: 1)when the anthracene units of (S)-1 are excited by UV light irradiation (Λcx=370nm, two excited species may be formed, in which the two anthracene units may exhibit different orientations in relation to the naphthalene and 1,3-dithole-2-thione units: 2) it is probable that in one excited species the anthracene units are close to 1,3-dilhole-2-thione units (and naphthalene units) and as a result, the fluorescence from this excited species would be largely quenched, which would lead to a rather short fluorescence lifetime; whereas in another excited species the anthracene units are well separated from 1,3-dithole-2-thione units (and naphthalene units, and accordingly the fluorescence from this excited species would not be quenched to a large extent. In fact, biexponential fluorescence decay was reported previously for the TTF-naphthalenediimide-TTF triad see X. G
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cx=370nm), two excited species may be formed, in which the two anthracene units may exhibit different orientations in relation to the naphthalene and 1,3-dithole-2-thione units: 2) it is probable that in one excited species the anthracene units are close to 1,3-dilhole-2-thione units (and naphthalene units) and as a result, the fluorescence from this excited species would be largely quenched, which would lead to a rather short fluorescence lifetime; whereas in another excited species the anthracene units are well separated from 1,3-dithole-2-thione units (and naphthalene units), and accordingly the fluorescence from this excited species would not be quenched to a large extent. In fact, biexponential fluorescence decay was reported previously for the TTF-naphthalenediimide-TTF triad (see X. Guo, Z. Gan, H. Luo, Y. Araki, D. Zhang, D. Zhu, O. Ito, J. Phys. Chem. A 2003, 107, 9747-9753). The solute-solvent interaction might also cause a biexponential fluorescence decay
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