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thus bypassing the wavelength dependence of the Laue intensities. A monochromatic reference structure is then used to recover the ‘light-on’ intensities. Using polychromatic radiation time-resolution becomes limited only by the larger of the width of the synchrotron and laser pulses. In addition to allowing studies of much shorterlived excited states, this should make it possible to monitor the initial steps of chemical reactions in solids. The suitability for this purpose of a number of solid-state reactions have been explored by steady state methods [1-3]. We find that trans-cis, cis-trans isomerizations and [2+2] cycloadditions in solids are highly stereospecific and activation-energy-controlled, so that their rate can be manipulated by adjustment of the temperature. A number of examples will be presented. Research supported by the US Department of Energy. [1] Zheng, S.-L.; Velde, C. M. L. V.; Messerschmidt, M.; Volkov, A.; Gembicky, M.; Coppens, P., Chem. Eur. J. 2008, 14, 706-713. [2] Zheng, S.-L.; Messerschmidt, M.; Coppens, P., Chem. Comm. 2007, 2735 2737. [3] Zheng, S.-L.; Messerschmidt, M.; Coppens, P., Acta Cryst. 2007, B63, 644-649.

Vapor-induced transformation followed by luminescence switching for a dinuclear platinum(II) complex