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Transient Species in the Laser Photolysis at 265 Mμ of the Halogenobenzenes in Solution
Author(s) -
Loeff I.,
Lutz H.,
Lindqvist L.
Publication year - 1970
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.197000021
Subject(s) - chemistry , fluorobenzene , cyclohexane , iodobenzene , chlorobenzene , photochemistry , laser , methanol , ultrafast laser spectroscopy , photodissociation , transient (computer programming) , reaction rate constant , absorption (acoustics) , analytical chemistry (journal) , atomic physics , kinetics , optics , benzene , organic chemistry , physics , quantum mechanics , computer science , operating system , catalysis
Pulsing cyclohexane or methanol‐water solutions of chlorobenzene and fluorobenzene with the Nd laser at 265 mμ (half‐height width 30 nsec) gives rise to intermediates, absorbing in the 290–300 mμ region, attributed to the corresponding triplet states. The decay of the triplet states is roughly first order with rate constants of (2.1 ± 0.1) × 10 6 sec −1 and (1.5 ± 0.1) × 10 6 sec −1 respectively. No transient absorption was observed with bromo‐ and iodobenzene under the same conditions. Solutions of the two latter compounds containing KI or KBr show the appearance of I − 2 or IBr − following laser excitation.