There are some diacetylenes which undergo polymerization reaction upon exposure to UV radiation. What property of the material is responsible for their UV sensitivity?
This is a fairly standard photo (or thermally) induced topochemical polymerisation reaction. Google Diacetylene polymerisation.
the conjugated triple bonds of diacetylene make them particularly UV sensitive
Thank you, yes I have gone through some papers regarding the reaction mechanism in diacetylenes. My question is that is it just the triple bond conjugation which is responsible for UV sensitivity? Any compound having conjugation will have the same behavior?
The pi electrons are only weakly bound, and are excited into antibonding orbitals, which can interact between molecules to form the polymer, leaving the sigma bonded carbon to maintain the backbone.
Thank you for the explanation.
Can you suggest the possible cause for a diacetylene compound to be highly UV sensitive but completely insensitive to higher energy radiations like gamma or x-ray?
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