title: Remarkable change in fluorescence emission of poly(diphenylacetylene) film via in situ desilylation reaction: correlation with variations in microporous structure, chain conformation, and lamellar layer distance.
abstract: Fluorescence (FL) emission properties, microporous structures, energy-minimized chain conformations, and lamellar layer structures of the silicon-containing poly(diphenylacetylene) derivative of p-PTMSDPA before and after desilylation were investigated. The nitrogen-adsorption isotherms of p-PTMSDPA film before and after desilylation were typical of type I, indicating microporous structures. The BET surface area and pore volume of the p-PTMSDPA film were significantly reduced after the desilylation reaction, simultaneously, its FL emission intensity remarkably decreased. The theoretical calculation on both model compounds of p-PTMSDPA and its desilylated polymer, PDPA, showed a remarkable difference in chain conformation: The side phenyl rings of p-PTMSDPA are discontinuously arranged in a zig-zag pattern, while the PDPA is continuously coiled in a helical manner. The lamellar layer distance (LLD) in the p-PTMSDPA film significantly decreased after the desilylation reaction.
authors.affiliation: Department of Polymer Science, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Daegu 702-701, Korea.
authors.forename: Wang-Eun
authors.initials: WE
authors.lastname: Lee
authors.forename: Dong-Cheul
authors.initials: DC
authors.lastname: Han
authors.forename: Dong-Hee
authors.initials: DH
authors.lastname: Han
authors.forename: Heung-Jin
authors.initials: HJ
authors.lastname: Choi
authors.forename: Toshikazu
authors.initials: T
authors.lastname: Sakaguchi
authors.forename: Chang-Lyoul
authors.initials: CL
authors.lastname: Lee
authors.forename: Giseop
authors.initials: G
authors.lastname: Kwak
mesh_terms: D000114:Acetylene / Q000031:analogs & derivatives* / Q000737:chemistry; D005453:Fluorescence; D015394:Molecular Structure; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*; D016062:Porosity; D012825:Silicon / Q000737:chemistry
chemical_list: D011108:Polymers; C044735:biphenylacetylene; D000114:Acetylene; D012825:Silicon