Non-radiative pathways of anilino-naphthalene sulphonates: Twisted intramolecular charge transfer versus intersystem crossing |
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| Institution: | 1. Istituto per lo Studio dei Materiali Nanostrutturati, c/o Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ad Ambientali, 98166, V.le F. Stagno D''Alcontres 31, Messina, Italy;2. Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ad Ambientali, and C.I.R.C.M.S.B., University of Messina, V.le F. Stagno D''Alcontres 31, Vill. S. Agata, 98166 Messina, Italy;3. Dipartimento di Scienze Chimiche, University of Catania, 95100, V. A Doria 6, Catania, Italy;4. CNR-IPCB Istituto per i Polimeri, Compositi e Biomateriali, Via P. Gaifami 18, 95126 Catania, Italy;5. CNR-IPCF Istituto per i Processi Chimico-Fisici, Viale F. Stagno d''Alcontres 37, 98158 Messina, Italy;1. Laboratory of Biochemistry and Bioscience, The United Graduate School of Agricultural Sciences, Kagoshima University, Kagoshima 890-0065, Japan;2. Laboratory of Sericultural Science, Graduate School of Agricultural Sciences, Kyushu University, Fukuoka 812-8581, Japan |
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| Abstract: | The effect of solvent polarity and external heavy atom (ethyl iodide) on the fluorescence properties of 2-tolouidino-6-naphthalene-sulphonate (TNS) and 1-anilino-8-naphthalene-sulphonate (ANS) have been studied. For ANS with rise in polarity, a monotonic decrease of fluorescence yield (αf) and lifetime (τf) is observed while ethyl iodide was found to have negligible effect. For TNS at low polarity αf and τf are found to increase with rise in polarity, while ethyl iodide causes a decrease in τf. At high polarity ET(30) > 51] behaviour of TNS is more or less similar to that of ANS. It is proposed that polarity-dependent, twisted intramolecular charge transfer is the main non-radiative process for ANS at all polarities ET(30) = 36–63] and for TNS only at high polarity. At low polarity intersystem crossing is the main non-radiative pathway for TNS. |
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