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The adiabatic photodissociation of the anthracene—tetracene photodimer

✍ Scribed by Sada-aki Yamamoto; Karl-Heinz Grellmann

Publisher
Elsevier Science
Year
1982
Tongue
English
Weight
667 KB
Volume
92
Category
Article
ISSN
0009-2614

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✦ Synopsis

We have recently shown that fhe photodlssociation of the photodtme~ of 9-meth},~~thracene (MA,) [ I] and of anthracene (A$ [2] takes place predomrnant-Iy from an electron~callp elcrted singlet state at higher temperatures and e\clusl\ely from an excited rnplet state below 170 K. In the singlet state the mam fractton of thz excited drmers is trapped in a mmlmum along the reaction coordmate (perhaps a pncychc minimum [3J) from whteh ==SO% of&e molecules re-IZU. back to the ground stale of rhe dlmers and 50% dw socratc drabatically mto ths monomzrs.

In this communicatron we wish ro report on the results of an inwstlparlon carned out wrh the nwxed phorodtmer, A-T, from anthrssene and letracene it turned out that this compo~d is qtute suitable to study the adiabatic pathway m more detad because, UI contrast to A? and MA?, rhe dlabauc photodrssoaatton takes place only with a low quantum yield A-T was prepared photochemtcallg accordmg to the method of Bouas-Laurent [SJ. recr~~stall~zed from THF-MCH and washed wirh MCH. The tetracene and

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