title: Nanofibers doped with a novel red-emitting Europium complex: synthesis, characterization, photophysical property and sensing activity toward molecular oxygen.
abstract: In this paper, we synthesize a novel diamine ligand of DIQ-Et and its corresponding Eu(III) complex of Eu(TTA)(3)DIQ-Et, where DIQ-Et=N-ethyl-10H-dipyrido-[f,h]-indolo-[3,2-b]-quinoxaline, and TTA=2-thenoyltrifluoroacetonate. The UV-vis absorption, photoluminescence, low temperature phosphorescence, energy transfer mechanism, and excited state lifetime of Eu(TTA)(3)DIQ-Et are investigated in detail. Data suggest that the emission of Eu(TTA)(3)DIQ-Et is quenchable by molecular oxygen due to the back-energy transfer process. By doping Eu(TTA)(3)DIQ-Et into a polymer matrix of poly(vinylpyrrolidone) (PVP), oxygen sensing performance of the resulted nanofibers is investigated. Finally, the 0.7 wt% doped sample exhibits a linear response toward molecular oxygen, with a sensitivity of 2.4 and response/recovery time of 12s/16s.
authors.affiliation: College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
authors.forename: Sun
authors.initials: S
authors.lastname: Jianliang
authors.forename: Hu
authors.initials: H
authors.lastname: Ge
authors.forename: She
authors.initials: S
authors.lastname: Qing
authors.forename: Zuo
authors.initials: Z
authors.lastname: Zhaohong
authors.forename: Guo
authors.initials: G
authors.lastname: Lei
mesh_terms: D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry*; D003959:Diamines / Q000737:chemistry; D004735:Energy Transfer; D005063:Europium / Q000737:chemistry*; D008024:Ligands; D008163:Luminescent Measurements / Q000379:methods*; D057139:Nanofibers / Q000737:chemistry*; D010100:Oxygen / Q000032:analysis*; D011205:Povidone / Q000737:chemistry; D012680:Sensitivity and Specificity; D013053:Spectrophotometry
chemical_list: D056831:Coordination Complexes; D003959:Diamines; D008024:Ligands; D005063:Europium; D011205:Povidone; D010100:Oxygen