title: Regiocontrolled synthesis of ethene-bridged para-phenylene oligomers based on Pt(II)- and Ru(II)-catalyzed aromatization.
abstract: We report the regiocontrolled syntheses of ethene-bridged para-phenylene oligomers in three distinct classes by using Pt(II)- and Ru(II)-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 pi conjugation with increasing array sizes, except for in one instance.
authors.affiliation: Department of Chemistry, National Tsing-Hua University, Hsinchu, 30013, Taiwan, RO China.
authors.forename: Tse-An
authors.initials: TA
authors.lastname: Chen
authors.forename: Te-Ju
authors.initials: TJ
authors.lastname: Lee
authors.forename: Ming-Yuan
authors.initials: MY
authors.lastname: Lin
authors.forename: Shariar M A
authors.initials: SM
authors.lastname: Sohel
authors.forename: Eric Wei-Guang
authors.initials: EW
authors.lastname: Diau
authors.forename: Shie-Fu
authors.initials: SF
authors.lastname: Lush
authors.forename: Rai-Shung
authors.initials: RS
authors.lastname: Liu
mesh_terms: D002384:Catalysis; D004563:Electrochemistry; D005030:Ethylenes / Q000737:chemistry*; D008027:Light; D009682:Magnetic Resonance Spectroscopy; D008956:Models, Chemical; D015394:Molecular Structure; D010777:Photochemistry / Q000379:methods; D010984:Platinum / Q000737:chemistry*; D012428:Ruthenium / Q000737:chemistry*
chemical_list: D005030:Ethylenes; D010984:Platinum; D012428:Ruthenium; C036216:ethylene