title: Hydrogen-bonding induced cooperative effect on the energy transfer in helical polynorbornenes appended with porphyrin-containing amidic alanine linkers.
abstract: Polynorbornenes appended with porphyrins containing a range of different linkers are synthesized. The use of bisamidic chiral alanine linkers between the pending porphyrins and the polymeric backbone has been shown to bring the adjacent porphyrin chromophores to more suitable orientation for exciton coupling owing to hydrogen bonding between the adjacent linkers. The hydrogen bonding between the adjacent pendants in these polymers may induce a cooperative effect and therefore render single-handed helical structures for these polymers. Such a cooperative effect is reflected in the enhancement of FRET efficiencies between zinc-porphyrin and free base porphyrin in random copolymers.
authors.affiliation: Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Lu, Shanghai 200032, China.
authors.forename: Zhi-Chang
authors.initials: ZC
authors.lastname: Liu
authors.forename: Chih-Hsien
authors.initials: CH
authors.lastname: Chen
authors.forename: Hsian-Wen
authors.initials: HW
authors.lastname: Wang
authors.forename: Yen-Chin
authors.initials: YC
authors.lastname: Huang
authors.forename: Ming-Jui
authors.initials: MJ
authors.lastname: Kao
authors.forename: Tsong-Shin
authors.initials: TS
authors.lastname: Lim
authors.forename: Tien-Yau
authors.initials: TY
authors.lastname: Luh
mesh_terms: D000409:Alanine; D002942:Circular Dichroism; D004735:Energy Transfer; D031541:Fluorescence Resonance Energy Transfer; D006860:Hydrogen Bonding; D009682:Magnetic Resonance Spectroscopy; D008665:Metalloporphyrins / Q000737:chemistry; D008958:Models, Molecular; D010969:Plastics / Q000138:chemical synthesis* / Q000737:chemistry*; D011108:Polymers / Q000138:chemical synthesis; D011166:Porphyrins / Q000138:chemical synthesis* / Q000737:chemistry*
chemical_list: D008665:Metalloporphyrins; D010969:Plastics; D011108:Polymers; D011166:Porphyrins; C071464:polynorbornen; C017802:zinc hematoporphyrin; D000409:Alanine