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<scp>dl</scp>-Serine Covalently Ornamented and Ln<sup>3+</sup>-Incorporated Arsenotungstates with Fast-Responsive Photochromic and Photoinduced Luminescent Switchable Behaviors

DOI

19

Citations

58

References

2022

Year

Kangting Zheng, Ya‐Jing Ye, Yanan Shi, Yaxuan Xu, Ziyu Yang, Pengtao Ma, Jingping Wang, Jingyang Niu
Inorganic Chemistry

Abstract

Three isostructural dl-serine covalently functionalized and multinuclear lanthanide (Ln<sup>3+</sup>)-embedded arsenotungstates, K<sub>2</sub>[{As<sub>4</sub>W<sub>44</sub>O<sub>137</sub>(OH)<sub>18</sub>(H<sub>2</sub>O)<sub>2</sub>(dl-Ser)<sub>2</sub>}{Ln<sub>2</sub>(H<sub>2</sub>O)<sub>4</sub>(dl-Ser)}<sub>2</sub>{Ln(H<sub>2</sub>O)<sub>7</sub>}<sub>2</sub>]·70H<sub>2</sub>O (Ln = Sm (<b>1</b>), Eu (<b>2</b>), and Gd (<b>3</b>); dl-Ser = C<sub>3</sub>H<sub>7</sub>NO<sub>3</sub>), were prepared, where the centrosymmetric [{As<sub>4</sub>W<sub>44</sub>O<sub>137</sub>(OH)<sub>18</sub>(H<sub>2</sub>O)<sub>2</sub>(dl-Ser)<sub>2</sub>}{Ln<sub>2</sub>(H<sub>2</sub>O)<sub>4</sub>(dl-Ser)}<sub>2</sub>]<sup>8-</sup> polyanion consists of two {As<sub>2</sub>W<sub>19</sub>O<sub>59</sub>(OH)<sub>8</sub>(H<sub>2</sub>O)}<sup>6-</sup> fragments, integrated with a two-dl-serine-ornamented [W<sub>6</sub>O<sub>23</sub>(OH)<sub>2</sub>(dl-Ser)<sub>2</sub>{Ln<sub>2</sub>(H<sub>2</sub>O)<sub>4</sub>}<sub>2</sub>]<sup>8-</sup> segment. In addition, the photochromic transformation of solid-state compounds <b>1</b>-<b>3</b> was observed from colorless to blue after a UV illumination of 4 min, and the decay process lasted as long as ∼20 h in the dark. The coloration kinetic half-life (<i>t</i><sub>1/2</sub>) values of compounds <b>1</b>, <b>2</b>, and <b>3</b> were calculated to be 0.597, 0.920, and 0.723 min, respectively. Furthermore, the luminescent properties and energy migration from arsenotungstates and organic chromophores to Sm<sup>3+</sup> and Eu<sup>3+</sup> ions in <b>1</b> and <b>2</b> have been intensively investigated. Further analysis manifests that <b>1</b> possesses an effective luminescent switchable behavior, triggered by its fast-responsive photochromism effect.

References

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