In the presence of the larger [H₂N(CH₃)₂]⁺ and K⁺ counter cations as structure‐stabilizing agents, a class of unprecedented selenium and lanthanide (Ln) simultaneously bridging tetra‐vacant Dawson‐like selenotungstate aggregates [H₂N(CH₃)₂]₂Na₉K₂H₁₉{[Ln₄W₄ Se₄O₂₂(H₂O)₅](Se₂W₁₄O₅₂)₂}₂⋅60 H₂O [Ln=Tb^III (1), Dy^III (2), Ho^III (3), Er^III (4), Tm^III (5), Yb^III (6)] have been obtained by the one‐pot assembly reaction of Na₂WO₄⋅2 H₂O, Ln(NO₃)₃⋅6 H₂O, and Na₂SeO₃ under moderately acidic aqueous conditions and the complexes were structurally characterized by elemental analyses, IR spectra, single‐crystal X‐ray diffraction, powder X‐ray diffraction (PXRD), and thermogravimetric (TG) analyses. It should be noted that the appropriate molar ratio of Se/W is extremely important in the formation of 1–6 and can effectively ameliorate the yield of 1–6. Moreover, dimethylamine hydrochloride is also indispensable and plays a considerably important role in improving the solubility of Ln ions and stabilizing the structures of 1–6. The main polyoxoanion skeletons of 1–6 are constructed from two sandwich‐type tetra‐vacant Dawson‐like {[Ln₄W₄Se₄O₂₂(H₂O)₅](Se₂W₁₄O₅₂)₂}¹⁶⁻ half‐units linked through two W‐O‐Ln bridges. The sandwich‐type half‐unit comprises two tetra‐vacant Dawson‐like [Se₂W₁₄O₅₂]¹²⁻ fragments encapsulating a unique dodecanuclear Se‐Ln‐W [Ln₄W₄Se₄O₂₂(H₂O)₅]⁸⁺ oxo cluster. Their solid‐state visible and NIR fluorescent properties and lifetime decay behaviors were measured and their solid‐state luminescent spectra mainly demonstrate the characteristic emission bands of Ln³⁺ ions. Moreover, the dominant wavelengths, the color purity, and correlated color temperatures of 1–5 have been also calculated. In addition, the luminous flux values of 1–5 are 2031, 6992, 3071, 921, and 477 lumen, respectively.

中文翻译：

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前所未有的硒和镧系元素同时桥接四个四空的道森类{Se2W14}单元稳定的硒酸钨酸盐聚集体

在存在较大的[H ₂ N（CH ₃）₂ ] ⁺和K ⁺抗衡阳离子作为结构稳定剂的情况下，一类前所未有的硒和镧系元素（Ln）同时桥接了四空位的道森样硒代非钨酸盐聚集体[H ₂ N（CH ₃）₂ ] ₂ Na ₉ K ₂ H ₁₉ {[Ln ₄ W ₄ Se ₄ O ₂₂（H ₂ O）₅ ]（Se ₂ W ₁₄ O ₅₂）₂} ₂ ⋅ 60 H ₂ -O [Ln为Tb的^III（1），DY ^III（2），何^III（3），铒^III（4），TM ^III（5），镱^III（6）]已经获得通过的Na的单罐装配反应₂ WO ₄ ⋅ 2小时₂ O，LN（NO ₃）₃ ⋅ 6 H ₂ O，和Na ₂的SeO ₃在中等酸性水溶液条件下，通过元素分析，红外光谱，单晶X射线衍射，粉末X射线衍射（PXRD）和热重（TG）分析对复合物进行结构表征。应当指出的是，硒/ W的相应的摩尔比在形成极其重要的1 - 6并能有效改善的产率1 - 6。此外，二甲胺盐酸盐也是不可缺少的，并对于提高LN离子的溶解度和稳定的结构的显着重要的作用1 - 6。1 – 6的主要多氧阴离子骨架由两个三明治型四空Dawson型{[Ln ₄ W ₄ Se ₄ O ₂₂（H ₂ O）₅ ]（Se ₂ W ₁₄ O ₅₂）₂ } ¹⁶⁻半单元构成，它们通过两个W- O-Ln桥。三明治型半单元由两个四空Dawson型[Se ₂ W ₁₄ O ₅₂ ] ¹²⁻片段组成，包裹了独特的十二烷核Se‐Ln‐W [Ln ₄ W ₄ Se ₄ O ₂₂（H ₂ O）₅] ⁸⁺氧簇。测量了它们的固态可见光和NIR荧光特性以及寿命衰减行为，它们的固态发光光谱主要显示了Ln ³⁺离子的特征发射带。此外，主波长，色纯度，并且相关色温1 - 5也已经计算。此外，光通量值1 - 5是2031，6992，3071，921，和477流明，分别。