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)

Rong Wan; Pengtao Ma; Mengdan Han; Dongdi Zhang; Chao Zhang; Jingyang Niu; Jingping Wang

doi:10.1039/c7dt00250e

Discovery and isolation of the trans-isomers of two 1 : 2-type lanthanide-containing monolacunary Dawson-type tungstophosphates: [Ln^III(α₂-P₂W₁₇O₆₁)₂]^17- (Ln = La, Ce)

Dalton Trans. 2017 Apr 19;46(16):5398-5405. doi: 10.1039/c7dt00250e.

Authors

Rong Wan¹, Pengtao Ma, Mengdan Han, Dongdi Zhang, Chao Zhang, Jingyang Niu, Jingping Wang

Affiliation

¹ 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.

PMID: 28386614
DOI: 10.1039/c7dt00250e

Abstract

Two novel trans-isomers of 1 : 2-type lanthanide-containing monolacunary Dawson-type tungstophosphates [Ln(α₂-P₂W₁₇O₆₁)₂]^17- (Ln = La^III (1), Ce^III (2)) were successfully isolated and characterized by elemental analysis, IR, TG, and ³¹P 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 solution ³¹P NMR spectroscopy revealed that the trans-[Ce(α₂-P₂W₁₇O₆₁)₂]^17- species probably quickly isomerizes to the cis-isomer species in solution.