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Crystal Structure and Reversible Photochromism of Pb(II)‐N,N‐Dimethylformamide Modified Keggin‐Type Polyoxometalates
Crystal Research and Technology ( IF 1.5 ) Pub Date : 2019-10-23 , DOI: 10.1002/crat.201900153
Tao Pang 1 , Zhen Zhou 2 , Dong Li 2 , Hong Liu 1, 3 , Zhanshu Zhang 2 , Liwei Qi 2 , Chao-Yu Song 1 , Guang-Gang Gao 1, 3 , Yuguang Lv 1
Affiliation  

Two Pb(II)‐DMF complex modified Keggin‐type polyoxometalate compounds, [Pb(DMF)7]2[SiW12O40] 2DMF (1) and [Pb(DMF)4(H2O)2][Pb2(μ2‐DMF)2(DMF)8][PW12O40]2 (2) (DMF = N,N‐dimethylformamide), have been demonstrated in this work. Both 1 and 2 are characterized by X‐ray single crystal diffraction, Fourier transform infrared (FTIR), and UV–vis spectra, and elemental analyses. The crystal structure analysis indicates that compound 1 is composed of Pb(II)‐DMF complex and Keggin‐type [SiW12O40]4− polyoxoanion, in which the Pb2+ coordinates to the polyoxoanion by different Pb−O bonds, while compound 2 is composed of [Pb(DMF)4(H2O)2]2+, dimeric [Pb2(μ2‐DMF)2(DMF)8]4+ cations, and two kinds of Keggin‐type [PW12O40]2− polyoxoanions. By ultraviolet irradiation, both 1 and 2 display the reversible color change from white (for 1) or light yellow (for 2) to blue, which can be applied as new crystalline photochromic materials. Upon heating, the blue color of the two compounds can be recovered within 5 min. The successful syntheses of compounds 1 and 2 provide a new route for the design and synthesis of reversible photochromic crystalline materials.

中文翻译:

Pb(II)-N,N-二甲基甲酰胺改性的Keggin型多金属氧酸盐的晶体结构和可逆光致变色

两种Pb(II)-DMF复合改性的Keggin型多金属氧酸盐化合物[Pb(DMF)7 ] 2 [SiW 12 O 40 ] 2DMF (1)和[Pb(DMF)4(H 2 O)2 ] [Pb 2μ 2 -DMF)2(DMF)8 ] [PW 12 ø 40 ] 2 (2)(DMF =  ññ二甲基甲酰胺),已被证明在这个工作。既12通过X射线单晶衍射,傅立叶变换红外(FTIR)和UV-vis光谱以及元素分析来表征。晶体结构分析表明,化合物1由Pb(II)-DMF配合物和Keggin型[SiW 12 O 40 ] 4-聚氧阴离子构成,其中Pb 2+通过不同的Pb-O键与聚氧阴离子配位,而化合物2是由铅[Pb(DMF)4(H 2 O)2 ] 2+,二聚体[铅2μ 2 -DMF)2(DMF)8 ] 4+阳离子和两种Keggin型[PW 12 O 40 ] 2-聚氧阴离子。通过紫外线照射,12都显示出可逆的颜色变化,从白色(对于1)或浅黄色(对于2)到蓝色,可以用作新的晶体光致变色材料。加热后,两种化合物的蓝色可在5分钟内恢复。化合物12的成功合成为可逆光致变色晶体材料的设计和合成提供了一条新途径。
更新日期:2019-10-23
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