Structural Transformation from Dimerization to Tetramerization of Serine‐Decorated Rare‐Earth‐Incorporated Arsenotungstates Induced by the Usage of Rare‐Earth Salts

This is the authors' abstract. We don't add key points for this paper.

Three types of serine-decorated rare- earth-containing arsenotungstate [H₂ N(CH₃ )₂ ]₆ NaH[RE₂ W₄ O₁₀ (H₂ O)₈ (Ser)₂ (B-α-AsW₉ O₃₃ )₂ ]⋅30 H₂ O (RE³⁺ =Eu³⁺ , Gd³⁺ , Tb³⁺ , Dy³⁺ , Ho³⁺ , Er³⁺ , Tm³⁺ , Yb³⁺ , and Y³⁺ ; 1), [H₂ N(CH₃ )₂ ]₆ Na6-x REx H4-2 x [RE₄ W₈ O₁₉ (H₂ O)10+y (OH)₂ (Ser)₂ (B-α-AsW₉ O₃₃ )₄ ]⋅n H₂ O (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 [H₂ N(CH₃ )₂ ]6-2 x Na2+3 x REx H10-6 x+y [RE₄ W₈ O₁₉ (H₂ O)₈ (OH)₂ (Ser)₄ (B-α-AsW₉ O₃₃ )₄ ]⋅Cly ⋅n H₂ O (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 [RE₂ W₄ O₁₀ (H₂ O)₈ (Ser)₂ ]¹⁰⁺ entity sandwiched by two [B-α-AsW₉ O₃₃ ]⁹⁻ moieties, whereas types 2 and 3 have a tetrameric square structure formed by four [B-α-AsW₉ O₃₃ ]⁹⁻ moieties that anchor a dual/tetra- Ser-participating [RE₄ W₈ O₁₉ (H₂ O)10+y (OH)₂ (Ser)₂ ]²⁰⁺ or [RE₄ W₈ O₁₉ (H₂ O)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.