Berlin 2005 – wissenschaftliches Programm

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MO: Molekülphysik

MO 22: Poster I

MO 22.26: Poster

Samstag, 5. März 2005, 10:30–12:30, Poster HU

Photo-induced structural changes in organic single crystals — •Jav Davaasambuu, Gerhard Busse, and Simone Techert — Max-Planck-Institute for biophysical Chemistry, Am Fassberg 11, 37077 Goettingen

Photo-induced structural changes in organic single crystals of 2-benzyl-5-benzylidenecyclopentanone[1] and 2,4-dichloro trans-cinnamic acid[2] have been investigated using high resolution x-ray diffraction. Single crystal to single crystal photodimerisations of these crystals are performed by irradiation monomer crystals with a high-pressure mercury lamp. The crystal structures of the monomer and the dimer for these crystals were solved by direct methods using the SHELXTL program package. In these single crystals a cyclobutane ring formed from parallel two C=C double bonds of neighbouring molecules by light irradiation. It was found that the variations of the unit cell parameters of these crystals are very small(much less than 2%). In this contribution we present our preliminary results for the photoinduced dimerisation in the single crystals.

This work was supported by the DFG, grant TE 347/1-2.

References

[1] Atkinson S.D.M., et al., Phys.Chem.Chem.Phys., 6, 4-6, (2004)

[2] Nakanishi H., et al., J.C.S. Chem.Comm., 611-612, (1980)