Dithienylethene metallodendrimers with high photochromic efficiency |
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| Institution: | 1. Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, China;2. State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China;3. Zhejiang Provincial Key Laboratory of Chemical Utilization of Forestry Biomass, Department of Chemistry, Zhejiang A&F University, Hangzhou 311300, China;4. College of Chemistry, Beijing Normal University, Beijing 100050, China |
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| Abstract: | It has been challenging to achieve multi-photochromic systems without affecting the individual photoswitching properties of the constituent units. Herein, we present the design and synthesis of a new family of platinum-acetylide dendrimers containing up to twenty-one photochromic dithienylethene (DTE) units that exhibit both high photochromic efficiency and individual switching properties. Upon irradiation with ultraviolet (UV) and visible (vis) light, the resultant metallodendrimers display high conversion yield and good fatigue resistance. More interestingly, cyclization-cycloreversion kinetics revealed that the photochromic property of each DTE unit in these metallodendrimers is unaffected by its neighbor and the full ring-closure of up to twenty-one DTE units in one single dendrimer has been achieved. |
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