Second-Order NLO Switches from Molecules to Polymer Films Based on Photochromic Cyclometalated Platinum(II) Complexes

作者：Boixel Julien; Guerchais Veronique^*; Le Bozec Hubert; Jacquemin Denis; Amar Anissa; Boucekkine Abdou; Colombo Alessia; Dragonetti Claudia; Marinotto Daniele; Roberto Dominique; Righetto Stefania; De Angelis Roberta

来源：Journal of the American Chemical Society, 2014, 136(14): 5367-5375.

DOI：10.1021/ja4131615

Novel photochromic dithienylethene-based platinum(II) complexes.((CNN)-N-boolean AND-N-boolean AND)Pt(C C-DTE-C6H4-D) (((CNN)-N-boolean AND-N-boolean AND) = 4,4%26apos;-di(n-hexyl)-6-phenyl-2,2%26apos;-bipyridine; D = H, NMe2) were prepared and characterized. Their excellent photochromic properties allow the photoinduced switching of their second-order nonlinear optical properties in solution, as measured by the EFISH technique, due to formation of an extended pi-conjugated ligand upon suitable electromagnetic radiation. Insights into the electronic structures of the complexes and the nature of their excited states have been obtained by DFT and TD-DFT calculations. These novel Pt(II) complexes were nanoorganized in polymer films which were poled, affording new materials characterized by a good second-order NLO response that can be easily switched, with an excellent NLO contrast. To the best of our knowledge, our compounds allowed designing the very first examples of switchable NLO polymer films based on metal complexes.

• 出版日期2014-4-9