Abstract
Many flexible aromatic molecules undergo spontaneous intramolecular rotational relaxation processes in the excited state leading to an energy minimum far away from the initial geometry which thus can be termed a photochemical product. Because the process occurs entirely in the excited state, it is called an “adiabatic photoreaction” [1]. An experimentally very well-studied example is the double-bond twisting of excited stilbene [2]. In recent years, the family of the Twisted Intramolecular Charge Transfer (TICT) compounds has been developed to a great extent [3–6]. In these compounds, two aromatic moieties are linked by a single bond, and excited-state rotational relaxation occurs towards a twisted conformation, coupled with intramolecular electron transfer (Fig. 4.1). Modern theoretical concepts can describe the twisting of both double and single bonds in one and the same model, that of biradicaloid states [6–8].
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Rettig, W. (1993). Kinetic Studies on Fluorescence Probes Using Synchrotron Radiation. In: Wolfbeis, O.S. (eds) Fluorescence Spectroscopy. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-77372-3_4
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DOI: https://doi.org/10.1007/978-3-642-77372-3_4
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