Abstract

Two ternary Ni(II) coordination polymers (CPs) named as: {[Ni₂(L1)₂(1,8-NDC)₂(H₂O)₂]·2H₂O}_n (1), {[Ni₂(L2)_1.5(FA)(H₂O)₃]·3.75H₂O}_n (2), (L1 = 1,6-bis(5,6-dimethylbenzimidazol-1-yl)hexane, L2 = bis(5,6-dimethylbenzimidazol-1-yl)methane, 1,8-H₂NDC = 1,8-naphthalenedicarboxylic acid, H₄FA = 4,4′-(hexafluoroisopropylidene)diphthalic acid) were hydrothermally synthesized and characterized through physicochemical and spectroscopic methods. CP 1 features a 1D double straight-line chain and further extends into a 2D layers via π–π stacking interactions, while CP 2 shows a unique 2D (5,4,4)-connected network. The thermal stabilities, luminescence properties and photocatalytic activities of CPs 1–2 for methylene blue decomposition were also presented in detail.

Graphic Abstract

Two luminescent Ni(II) coordination polymers (CPs) were synthesized under hydrothermal condition. The crystal structure of CP 1 features a 1D double straight-line chain and further extends into a 2D layers via π–π stacking interactions, while CP 2 shows a unique 2D (5,4,4)-connected network. The photocatalytic experiments in the presence of catalysts CP 1 indicated higher degradation efficiency for MB solution than CP 2, and ^·OH radical plays a key effect in the efficient degradation of MB.

中文翻译：

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柔性双（苯并咪唑-1-基）烷烃和多羧酸根配体的两种镍（II）配位聚合物的合成，晶体结构和光催化活性

摘要

两个三元Ni（II）配位聚合物（CPs），命名为：{[Ni ₂（L1）₂（1,8-NDC）₂（H ₂ O）₂ ]·2H ₂ O} _n（1），{[Ni ₂（L2）_1.5（FA）（H ₂ O）₃ ]·3.75H ₂ O} _n（2），（L1 = 1,6-双（5,6-二甲基苯并咪唑-1-基）己烷，L2 =双（5,6-二甲基苯并咪唑-1-基）甲烷，1,8-H ₂ NDC = 1,8-萘二甲酸，H ₄水热合成FA = 4,4'-（六氟异亚丙基）二邻苯二甲酸），并通过理化和光谱法对其进行表征。CP 1具有一维双直线链，并通过π-π堆叠相互作用进一步扩展为2D层，而CP 2显示了一个独特的2D（5,4,4）连接的网络。还详细介绍了CP 1 – 2对亚甲基蓝分解的热稳定性，发光性能和光催化活性。

图形摘要

在水热条件下合成了两种发光的Ni（II）配位聚合物（CPs）。CP 1的晶体结构具有一维双直线链，并通过π – π堆叠相互作用进一步扩展为2D层，而CP 2则显示了一个独特的2D（5,4,4）连接的网络。在催化剂CP 1的存在下进行的光催化实验表明，MB溶液的降解效率要比CP 2高，并且^· OH自由基在MB的有效降解中起关键作用。