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  Evidence for point transformations in photoactive molecular crystals by the photoinduced creation of diffuse diffraction patterns.

Hallmann, J., Moré, R., Morgenroth, W., Paulmann, C., Kong, Q., Wulff, M., et al. (2012). Evidence for point transformations in photoactive molecular crystals by the photoinduced creation of diffuse diffraction patterns. Journal of Physical Chemistry B, 116(36), 10996-11003. doi:10.1021/jp3020832.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-ED1B-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-926E-0
Genre: Journal Article

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Hallmann, J.1, Author              
Moré, R.1, Author              
Morgenroth, W., Author
Paulmann, C., Author
Kong, Q., Author
Wulff, M., Author
Techert, S.1, Author              
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1Research Group of Structural Dynamics of (Bio)Chemical Systems, MPI for biophysical chemistry, Max Planck Society, ou_578564              

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 Abstract: Time-resolved diffuse X-ray scattering is one powerful method for monitoring the progression from the creation of local structural changes inside a crystalline material up to the transformation of the whole crystalline bulk. In this work, we study the mechanism of phototransformation of a molecular crystal by time-resolved diffuse X-ray scattering. Here, an optical excitation source, like a pulsed laser, initiates structural transformations which are monitored by X-ray scattering techniques. We have studied the dimerization process of the molecular switch α-styrylpyrylium (trifluoromethanesulfonate) TFMS, in particular for understanding whether cooperative effects influence the changes of the structure in the bulk and its periodicity. Upon illumination with optical light, α-styrylpyrylium TFMS instantaneously photoswitches. Depending on the optical fluence, X-ray diffuse planes are observed prior to phototransformation of the bulk. In the early stages of transformation, the analysis reveals systems of randomly distributed islands of product clusters with gradual growth in size and amount. The degree of transformation follows the optical excitation profile, i.e., the spatial absorption of the laser beam. In the present studies, no influence of cooperativity on the photodimerization process has been found.

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Language(s): eng - English
 Dates: 2012-08-302012
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1021/jp3020832
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Title: Journal of Physical Chemistry B
Source Genre: Journal
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Pages: - Volume / Issue: 116 (36) Sequence Number: - Start / End Page: 10996 - 11003 Identifier: -