Two novel two-dimensional (2D) uranyl coordination polymers, namely [(UO₂)(bpda)]_n (1) and [(UO₂)(bpda)(nmp)]_n (2) (bpda = [1,1′-biphenyl]-2,4′-dicarboxylic acid, nmp = N-methyl pyrrolidone), were synthesized by a hydrothermal method. Single-crystal structural analyses reveal that both polymers were constructed by the packing of 2D uranyl coordination networks via supramolecular interactions. The 2D network of 1 was constructed from distorted pentagonal bipyramid uranyl chains, while which was dual uranyl pentagonal bipyramid for 2. Topological simplification obtained 2D topological symbol of {4²·8⁴}{4⁶} for 1 and 4-c {4⁴·6²} for 2. Both polymers exhibit the emblematic charge-transfer green emission of uranyl-bearing complexes. The UV-vis absorption spectra reveal distinct light absorption both on the ultraviolet and visible regions for 1 and 2. Excellent activities of the photocatalytic degradation of rhodamine B (RhB) in aqueous solutions using polymers 1 and 2 were studied, 84.0% of the RhB was degraded in only 30 min under the photocatalysis of 1 and almost all of the RhB (99.7%) was degraded in 90 min by the photocatalysis of 2. These two new 2D uranyl coordination polymers represented effective RhB photocatalytic degradation materials in aqueous solution.

中文翻译：

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两种2D铀酰配位聚合物的水热合成：罗丹明B的结构，发光和光催化降解

两种新型的二维（2D）铀酰配位聚合物，即[（UO ₂）（bpda）] _n（1）和[（UO ₂）（bpda）（nmp）] _n（2）（bpda = [1,1通过水热法合成了'-联苯基] -2,4'-二羧酸（nmp = N-甲基吡咯烷酮）。单晶结构分析表明，这两种聚合物都是通过超分子相互作用将2D铀酰配位网络堆积而成。的2D网络1从扭曲的五角双锥铀酰链构成，而这是双氧铀五角双锥为2。拓扑简化得到的二维拓扑符号{4 ² ·8 ⁴ } {4 ⁶ }为1和4-C {4 ⁴ ·6 ² }为2。两种聚合物均显示出具有铀酰的配合物的标志性电荷转移绿色发射。UV-vis吸收光谱显示1和2的紫外线和可见光区域都有明显的光吸收。在使用聚合物的水溶液罗丹明B（罗丹明B）的光催化降解的极好的活性1和2进行了研究，所述罗丹明B 84.0％在仅30分钟的光催化作用下被降解1在90分钟内，2的光催化降解了几乎所有的RhB（99.7％）。这两种新的2D铀酰配位聚合物代表了水溶液中有效的RhB光催化降解材料。