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Photochemical behaviour of 4-styrylcoumarin polymorphs in the crystalline state
Kodumuru Vishnumurthy1, Tayur N Guru Row, Kailasam Venkatesan
1Department of Organic Chemistry, Indian Institute of Science, Bangalore, 560 012, India. kvishnumurthy@hotmail.com
Abstract:
Addition of a small amount of coumarin during crystallization produces new polymorphic modifications in 4-styrylcoumarin and 4-(3-fluorostyryl)coumarin, which are photolabile. Interestingly, upon irradiation polymorphic modification of 4-(3-fluorostyryl)coumarin produces a mirror-symmetric photodimer in contrast to the centrosymmetric photodimer obtained without addition of coumarin during crystallization.
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