title: Discovery and isolation of the trans-isomers of two 1 : 2-type lanthanide-containing monolacunary Dawson-type tungstophosphates: [LnIII(α2-P2W17O61)2]17-(Ln = La, Ce).
abstract: Two novel trans-isomers of 1 : 2-type lanthanide-containing monolacunary Dawson-type tungstophosphates [Ln(α2-P2W17O61)2]17-(Ln = LaIII(1), CeIII(2)) were successfully isolated and characterized by elemental analysis, IR, TG, and31P NMR studies. Both polyanions 1 and 2 consist of one Ln3+ion sanwiched between two monolacunary Dawson-type tungstophosphates fragments [α2-P2W17O61]10-oriented at 180° with respect to each other. The solid-state and solution31P NMR spectroscopy revealed that the trans-[Ce(α2-P2W17O61)2]17-species probably quickly isomerizes to the cis-isomer species in solution.
authors.affiliation: Henan Key Laboratory of Polyoxometalate Chemistry, Institute of Molecular and Crystal Engineering, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, Henan 475004, P. R. China. jyniu@henu.edu.cn jpwang@henu.edu.cn.
authors.forename: Rong
authors.initials: R
authors.lastname: Wan
authors.forename: Pengtao
authors.initials: P
authors.lastname: Ma
authors.forename: Mengdan
authors.initials: M
authors.lastname: Han
authors.forename: Dongdi
authors.initials: D
authors.lastname: Zhang
authors.forename: Chao
authors.initials: C
authors.lastname: Zhang
authors.forename: Jingyang
authors.initials: J
authors.lastname: Niu
authors.forename: Jingping
authors.initials: J
authors.lastname: Wang