Photodimerization of Anthracene Single Crystals in Situ in the Electron Microscope

Details Photodimerization of Anthracene Single Crystals in Situ in the Electron Microscope Photodimerization of Anthracene Single Crystals in Situ in the Electron Microscope

Jul 1971

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971rspsa.324...37r&link_type=abstract

Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, Volume 324, Issue 1556, pp. 37-43

Physics

3

Scientific paper

Thin (001) plates of pure anthracene ≈ 50 nm thick in the c* direction) have been dimerized in situ in an electron microscope at approximately -100oC by irradiating them with the 366 nm line from a mercury vapour lamp. Selected-area diffraction patterns and the corresponding bright-field micrographs show that the dianthracene forms in one of the topotactic relationships with the original anthracene encountered in X-ray diffraction studies (O'Donnell 1968), i.e. [010]A\|[010]D and [102]A\|[001]D. Crystallites of dianthracene ≈ 10 nm in diameter are formed and the photographs appear to rule out both a gas phase reaction and any kind of cooperative phenomenon involving an intermediate conversion of strings or sheets of molecules preceding final recrystallization, as found for anthracene photo-oxide (Lonsdale, Nave & Stephens 1966).

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