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Synthesis, Structures and Properties of Two Ln(III) Coordination Polymers based on Pyrimidine‐2‐carboxylic Acid and Sodium Dicyanamide
Zeitschrift für anorganische und allgemeine Chemie ( IF 1.1 ) Pub Date : 2020-12-22 , DOI: 10.1002/zaac.202000368
Jun Xia 1 , Chen‐Han Wang 1
Affiliation  

Assemblies of pyrimidine‐2‐carboxylic acid (Hpmc) and samarium nitrate or europium nitrate in the presence of sodium dicyanamide (Na‐dca) under ambient conditions yielded two new coordination polymers, namely [Ln(pmc)2(dca)(H2O)2]n (Ln=Sm (1), Eu (2)). The complexes were characterized by single‐crystal X‐ray diffraction analysis, elemental analysis, IR and fluorescence spectra. Structure analysis shows two complexes are isostructural with monoclinic (C2/c) symmetry. And each central metal atom is coordinated by three chelate pmc, one terminal dca and two water molecules to generate an infinite zigzag chain. Through Owater−H ⋅ ⋅ ⋅ Ocarboxylate, Owater−H ⋅ ⋅ ⋅ Npyrimidine hydrogen bonds, the chains are connected to a two‐dimensional net, which is furtherly extended to a three‐dimensional supramolecular structure by Owater−H ⋅ ⋅ ⋅ Ncyano hydrogen bonds. Luminescent measurement of complex 2 shows the characteristic fluorescence of Eu3+.

中文翻译:

两种基于嘧啶-2-羧酸和双氰胺的Ln(III)配位聚合物的合成,结构和性能

在环境条件下,在存在双氰胺钠(Na-dca)的情况下,嘧啶-2-羧酸(Hpmc)和硝酸sa或硝酸euro的组装产生了两种新的配位聚合物,即[Ln(pmc)2(dca)(H 2) O)2 ] n(Ln = Sm(1),Eu(2))。通过单晶X射线衍射分析,元素分析,红外光谱和荧光光谱对复合物进行表征。结构分析表明,两种配合物是同构的,具有单斜(C 2 / c)对称性。并且每个中心金属原子是由三个螯合物PMC协调- ,一个端子DCA -和两个水分子产生无限的锯齿形链。通过O water -H⋅⋅O羧酸盐,O water -H⋅⋅N嘧啶氢键,这些链连接到二维网,并通过O water -H进一步扩展为三维超分子结构。⋅⋅⋅N氰基氢键。配合物2的发光测量显示Eu 3+的特征荧光。
更新日期:2020-12-22
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