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CHAPTER 4

A Little Photochemistry and Luminescence

A round-up of the main photochemical principles underlying chemically-driven luminescent switches is presented and their relationships are outlined. Several of these principles relate to electronically excited states involving charge transfer of some description: internal charge transfer (ICT), twisted internal charge transfer (TICT) and charge transfer (CT). The switching behaviour is controlled by charge effects of the chemical inputs once they engage a receptor site. On the other hand, the switching action of metal-centered (MC) or nπ* and ππ* excited states are due to more subtle chemical interactions. Post-excitation processes such as photoinduced electron transfer (PET), excited state intramolecular proton transfer (ESIPT), electronic energy transfer (EET) and association, e.g. excimer formation, also find wide use.

Publication details


Print publication date
29 Nov 2012
Copyright year
2012
Print ISBN
978-1-84973-148-5
PDF eISBN
978-1-84973-302-1