The reaction of uranyl acetate dihydrate with 2,5-thiophenedicarboxylic acid (H₂TDC) as the main ligand and pyrazine (PYZ); piperazine (PZ); 1,4 pyridyl piperazine (PYPZ); 1,4-di(pyridin-4-yl) piperazine (DPYZ); 1,2 pyrimidyl piperazine (PMPZ) as auxiliary ligand leads to the formation of five new compounds [UO₂(TDC)(H₂O)]·(PYZ)_0.5·H₂O, (I); [(UO₂)₂(TDC)₃]·(HPZ)·4(H₂O), (II); [UO₂(TDC)₂(H₂O)]·(H₂DPYZ)·H₂O, (III); [UO₂(TDC)₃]·(H₂DPYZ), (IV); [(UO₂)₂(TDC)₃(H₂O)]·(H₂PMPZ).H₂O, (V). They were analyzed by IR, UV–vis, thermogravimetric analysis, X-ray diffraction analysis, powder X-ray diffraction, and fluorescence spectroscopy. Depending on the countercation, uranyl thiophene dicarboxylate is shown to crystallize as 2D layer in (I, IV), 2D layer with twofold interpenetrated (6,3) nets in (II), 1D chains in (III), and 2D layer without 2-fold interpenetrated (6,3) nets in (V). The coligand DPYZ in structures of (III and IV) had not been added to the reaction but has been formed by the N-arylation of the PYPZ ligand. Compound (IV) was obtained serendipitously while trying some mixed metal compound. Furthermore, their functional properties, photoluminescence, and photocatalytical activity for oxidation of organic dyes have also been studied. Interestingly, compounds (II and V) with uranyl organic frameworks (UOF’s) and honeycomb (6,3) nets possess highest efficiency in degradation of dyes.

中文翻译：

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吡嗪/哌嗪类客体分子对铀酰噻吩二羧酸配位聚合物晶体结构的影响：结构多样性和光催化降解有机染料的活性

乙酸铀酰二水合物与2,5-噻吩二甲酸（H ₂ TDC）为主配体与吡嗪（PYZ）反应；哌嗪（PZ）; 1,4吡啶基哌嗪（PYPZ）; 1,4-二（吡啶-4-基）哌嗪（DPYZ）; 1,2嘧啶基哌嗪（PMPZ）作为辅助配体导致形成5个新化合物[UO ₂（TDC）（H ₂ O）]·（PYZ）_0.5 ·H ₂ O，（I）；[（UO ₂）₂（TDC）₃ ]·（HPZ）·4（H ₂ O），（II）; [UO ₂（TDC）₂（H ₂ O）]·（H ₂ DPYZ）·H ₂ O，（III）; [UO ₂（TDC）₃ ]·（H ₂ DPYZ），（IV）；[（UO ₂）₂（TDC）₃（H ₂ O）]·（H ₂ PMPZ）.H ₂ O，（V）。通过红外，紫外-可见，热重分析，X射线衍射分析，粉末X射线衍射和荧光光谱对它们进行了分析。根据不同的抗衡阳离子，噻吩双氧铀二羧酸示于（结晶成2D层我，IV），2D层用双重互穿（6,3）在（网II），1D中的氨基酸（III），以及在（V）中没有2互穿互（6,3）网的2D层。（III和IV）结构中的大肠菌DPYZ尚未添加到反应中，而是通过PYPZ配体的N-芳基化反应形成的。尝试混合一些金属化合物时，偶然获得了化合物（IV）。此外，还研究了它们的功能性质，光致发光和对有机染料氧化的光催化活性。有趣的是，具有铀酰有机骨架（UOF's）和蜂窝（6,3）网的化合物（II和V）在降解染料方面具有最高的效率。