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 [H 2 N(CH 3 ) 2 ] 6 NaH[RE 2 W 4 O 10 (H 2 O) 8 (Ser) 2 (B‐α‐AsW 9 O 33 ) 2 ]⋅30 H 2 O (RE 3+ =Eu 3+ , Gd 3+ , Tb 3+ , Dy 3+ , Ho 3+ , Er 3+ , Tm 3+ , Yb 3+ , and Y 3+ ; 1 ), [H 2 N(CH 3 ) 2 ] 6 Na 6− x RE x H 4−2 x [RE 4 W 8 O 19 (H 2 O) 10+ y (OH) 2 (Ser) 2 (B‐α‐AsW 9 O 33 ) 4 ]⋅ n H 2 O (RE 3+ =Tb 3+ , x= 1, y= 2, n =36; RE 3+ =Dy 3+ , Ho 3+ , Er 3+ , Yb 3+ , Y 3+ , x= 0, y= 0, n =38; RE 3+ = Tm 3+ , x= 1, y= 0, n =38; Ser=serine; 2 ), and [H 2 N(CH 3 ) 2 ] 6−2 x Na 2+3 x RE x H 10−6 x + y [RE 4 W 8 O 19 (H 2 O) 8 (OH) 2 (Ser) 4 (B‐α‐AsW 9 O 33 ) 4 ]⋅Cl y ⋅ n H 2 O (RE 3+ =Ce 3+ , Pr 3+ , x= 1, y= 0, n =65; RE 3+ =Nd 3+ , Sm 3+ , x= 0, y= 0, n =65; RE 3+ =Eu 3+ , Gd 3+ , 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 [RE 2 W 4 O 10 (H 2 O) 8 (Ser) 2 ] 10+ entity sandwiched by two [B‐α‐AsW 9 O 33 ] 9− moieties, whereas types 2 and 3 have a tetrameric square structure formed by four [B‐α‐AsW 9 O 33 ] 9− moieties that anchor a dual/tetra‐ Ser‐participating [RE 4 W 8 O 19 (H 2 O) 10+ y (OH) 2 (Ser) 2 ] 20+ or [RE 4 W 8 O 19 (H 2 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.