Triplet sate

Of particular importance are the times which the molecule spends in the various states. Absorption occurs in around 10 s. This can be considered to be instantaneous and is roughly a factor of ten times faster than the molecular vibrations. The time in the singlet excited state is of the order of nanoseconds, while the time in the triplet sate can be anything from microseconds, through milliseconds, to... 

This review has described the fundamental electron-transfer properties of fullerenes together with a variety of electron-transfer reactions of fullerenes, which often lead to a new type of derivatization of fullerenes. The small reorganization energy of fullerenes, especially in electron-transfer reactions, and the tong triplet excited sate lifetimes has rendered fullerenes as useful components in the design of novel elec-... 

Figure 4.6 Diagram of excited states (ground state So, first excited singlet state S], lowest triplet state T, and higher triplet states T ) and transition processes between these sates fora phthalocyanine with a closed-shell central metal. Reprinted with permission from [178).

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