title: Structural Transformation from Dimerization to Tetramerization of Serine-Decorated Rare-Earth-Incorporated Arsenotungstates Induced by the Usage of Rare-Earth Salts.
abstract: Three types of serine-decorated rare- earth-containing arsenotungstate [H2N(CH3)2]6NaH[RE2W4O10(H2O)8(Ser)2(B-α-AsW9O33)2]⋅30 H2O (RE3+=Eu3+, Gd3+, Tb3+, Dy3+, Ho3+, Er3+, Tm3+, Yb3+, and Y3+; 1), [H2N(CH3)2]6Na6-xRExH4-2 x[RE4W8O19(H2O)10+y(OH)2(Ser)2(B-α-AsW9O33)4]⋅n H2O (RE3+=Tb3+, x=1, y=2, n=36; RE3+=Dy3+, Ho3+, Er3+, Yb3+, Y3+, x=0, y=0, n=38; RE3+= Tm3+, x=1, y=0, n=38; Ser=serine; 2), and [H2N(CH3)2]6-2 xNa2+3 xRExH10-6 x+y[RE4W8O19(H2O)8(OH)2(Ser)4(B-α-AsW9O33)4]⋅Cly⋅n H2O (RE3+=Ce3+, Pr3+, x=1, y=0, n=65; RE3+=Nd3+, Sm3+, x=0, y=0, n=65; RE3+=Eu3+, Gd3+, x=1, y=2, n=45; 3) were synthesized with the participation of the organic solubilizers dimethylamine hydrochloride and l-serine and were structurally characterized. The use of different amounts of rare-earth salts results in the structural transformation from dimerization to tetramerization of types 1-3. Type 1 is a dimeric sandwich-type assembly of a dual-Ser-participating [RE2W4O10(H2O)8(Ser)2]10+entity sandwiched by two [B-α-AsW9O33]9-moieties, whereas types 2 and 3 have a tetrameric square structure formed by four [B-α-AsW9O33]9-moieties that anchor a dual/tetra- Ser-participating [RE4W8O19(H2O)10+y(OH)2(Ser)2]20+or [RE4W8O19(H2O)8(OH)2(Ser)4]20+core. The solid-state luminescence properties and lifetime-decay behaviors of these compounds were investigated. The chromaticity coordinates, dominant wavelengths, color purities, and correlated color temperatures were also calculated.
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.|MOE Key Laboratory of Cluster Science, School of Chemistry, Beijing Institute of Technology, Beijing, 100081, P.R. China.
authors.forename: Hai-Lou
authors.initials: HL
authors.lastname: Li
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.
authors.forename: Ya-Jie
authors.initials: YJ
authors.lastname: Liu
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.
authors.forename: Jing-Lin
authors.initials: JL
authors.lastname: Liu
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.
authors.forename: Li-Juan
authors.initials: LJ
authors.lastname: Chen
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.
authors.forename: Jun-Wei
authors.initials: JW
authors.lastname: Zhao
authors.affiliation: MOE Key Laboratory of Cluster Science, School of Chemistry, Beijing Institute of Technology, Beijing, 100081, P.R. China.
authors.forename: Guo-Yu
authors.initials: GY
authors.lastname: Yang
keywords: arsenotungstates; luminescence; polyoxometalates; rare earths; self-assembly