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Photophysics and photochromism of Δ2,2' -BI-(2H-1,4-benzothiazine)

✍ Scribed by R.S. Becker; L.V. Natarajan

Book ID
103024375
Publisher
Elsevier Science
Year
1986
Tongue
English
Weight
285 KB
Volume
132
Category
Article
ISSN
0009-2614

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✦ Synopsis

A*~*'-bi-(2H-1,4-benzothiazine) shows striking photochromism and thermochromism. The color change is thermally and photochemically reversible. The photochromism can be ascribed to the cis-tram isomerization about the central double bond, the yellow tram isomer being more stable. The quantum yield of formation @ cp of the cis-benzothiazine from tram in dioxan was found to be 0.035 at 355 nm excitation. Laser flash photolysis of the trans-benzothiazine revealed that the excited singlet state of II, x* character is the originating state for the photochromism since there is no experimental evidence of a triplet intermediate.

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