title: Four super water-stable lanthanide-organic frameworks with active uncoordinated carboxylic and pyridyl groups for selective luminescence sensing of Fe(3.).
abstract: Four super water-stable isostructural lanthanide-organic frameworks, [Ln(HL)(H2O)2]n·2H2O (1-Ln) (Ln = Eu, Tb, Nd and Sm), have been successfully synthesized under hydrothermal conditions with 3,5-di(2,4-dicarboxylphenyl)pyridine (H4L) and Ln(NO3)3·6H2O. 1-Ln shows a novel 2D layered structure with uncoordinated carboxylic and pyridyl groups pointing to the interior of interlayer channels. The luminescent properties of 1-Eu in the solid state and one steeped in aqueous solution have been measured, which show excellent luminescence and good luminescent stability in water. Next 1-Eu was chosen as a probe for sensing different metal ions. Consequently, 1-Eu exhibits a highly selective response to Fe(3+) through the luminescence quenching effect in aqueous solutions. The probable mechanisms of the quenching effects have been investigated in detail.
authors.affiliation: Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, Shaanxi Key Laboratory of Physico-Inorganic Chemistry, College of Chemistry & Materials Science, Northwest University, Xi'an 710069, P. R. China. wyaoyu@nwu.edu.cn.
authors.forename: Yu-Tong
authors.initials: YT
authors.lastname: Liang
authors.forename: Guo-Ping
authors.initials: GP
authors.lastname: Yang
authors.forename: Bo
authors.initials: B
authors.lastname: Liu
authors.forename: Yang-Tian
authors.initials: YT
authors.lastname: Yan
authors.forename: Zheng-Ping
authors.initials: ZP
authors.lastname: Xi
authors.forename: Yao-Yu
authors.initials: YY
authors.lastname: Wang