Second activity, photoswitching

Very recently, the efficient photoswitching of the second-order NLO responses of some dipolar photochromic Zn° complexes (9) was reported [71]. The NLO activity for the open forms is very small, as expected for the absence of 7i-conjuga-tion between the two thiophene rings. Upon conversion to the closed form in the photo-stationary state, the NLO activity increases dramatically (/i)So(EFISH) from... 

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