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Regiocontrolled Synthesis of Ethene‐Bridged para‐Phenylene Oligomers Based on PtII‐ and RuII‐Catalyzed Aromatization |
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| Authors: | Tse‐An Chen Dipl‐Chem Te‐Ju Lee Dr Ming‐Yuan Lin Dr Shariar M A Sohel Dr Eric Wei‐Guang Diau Prof Dr Shie‐Fu Lush Prof Dr Rai‐Shung Liu Prof Dr |
| Institution: | 1. Department of Chemistry, National Tsing‐Hua University, Hsinchu, 30013, Taiwan (R.O. China), Fax: (+886)?3‐5711082;2. Department of Applied Chemistry, National Chiao‐Tung University, Hsinchu, 30010, Taiwan (R.O. China);3. Department of Medical Technology, Yuanpei University, Hsinchu, 30015, Taiwan (R.O. China) |
| Abstract: | We report the regiocontrolled syntheses of ethene‐bridged para‐phenylene oligomers in three distinct classes by using PtII‐ and RuII‐catalyzed aromatization. This synthetic approach has been developed based on twofold aromatization of the 1‐aryl‐2‐alkynylbenzene functionality, which proceeds by distinct regioselectivity for platinum and ruthenium catalysts. Variable‐temperature NMR spectra provide evidence that large arrays of these oligomers are prone to twist from planarity. The UV/Vis and photoluminescence (PL) spectra as well as the band gaps of these regularly growing arrays show a pattern of extensive π conjugation with increasing array sizes, except for in one instance. |
| Keywords: | catalysis platinum polyaromatic oligomers regiocontrol ruthenium |