SPECTRAL FEATURES OF THE TRIPLETS OF SOME DIKETONES.
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Date
1969
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Publisher
Ohio State University
Abstract
Flash photolysis of solutions of the diketones camphorquinone, biacetyl, benzil and p-benzoquinone in various solvents---benzene, carbontetrachloride, iso-propanol and water---with light of $\lambda > 350 m\mu$ leads to the formation of their triplet excited molecules. The absorption spectra of these triplets has been measured in the region $200-1200 m\mu$. The most prominent feature of these spectra is the strong absorption in the near infra-red ($600-1200 m\mu$) by the camphorquinone and the biacetyl triplets. The benzil triplet also absorbs, though weakly, in this region but the p-benzoquinone triplet does not. Our work suggests that all the bands in the spectra of the triplets are not necessarily due to transitions, to higher levels in the triplet manifold, of the electron that has been raised to the lowest triplet level.
Description
Flash photolysis of solutions of the diketones camphorquinone, biacetyl, benzil and p-benzoquinone in various solvents---benzene, carbontetrachloride, iso-propanol and water---with light of $\lambda > 350 m\mu$ leads to the formation of their triplet excited molecules. The absorption spectra of these triplets has been measured in the region $200-1200 m\mu$. The most prominent feature of these spectra is the strong absorption in the near infra-red ($600-1200 m\mu$) by the camphorquinone and the biacetyl triplets. The benzil triplet also absorbs, though weakly, in this region but the p-benzoquinone triplet does not. Our work suggests that all the bands in the spectra of the triplets are not necessarily due to transitions, to higher levels in the triplet manifold, of the electron that has been raised to the lowest triplet level.
Author Institution: Materials Science Branch, Atomic Energy of Canada Limited Whiteshell, Nuclear Research Establishment
Author Institution: Materials Science Branch, Atomic Energy of Canada Limited Whiteshell, Nuclear Research Establishment