Abstract

The reactions of Cd(NO₃)₂ ⋅ 4H₂O with 2-amino-5-bromopyridine (Аbp) afford compounds [Cd(NO₃)₂(Аbp)(H₂O)]_n (I) and [Cd(NO₃)₂(Abp)₂(H₂O)₂] (II). The structures of both complexes are determined by single-crystal X-ray structure analysis (CIF files CCDC nos. 1938624 (I) and 1959680 (II)). Compound I is a coordination 1D polymer in which two chelate-bonded \({\text{NO}}_{3}^{ - }\) groups act as bridges. The coordination polyhedron of the octacoordinated central cadmium atom in compound I consists of seven oxygen atoms (one oxygen atom of water and six atoms of the \({\text{NO}}_{3}^{ - }\) groups) and one nitrogen atom of Abp, being a triangular dodecahedron. Complex II is a mononuclear molecule in which the octahedral coordination polyhedron of Cd is formed by four oxygen atoms of two water molecules and two \({\text{NO}}_{3}^{ - }\) groups and two oxygen atoms of two molecules of the Abp cycle. In both complexes, the amino group of Abp is not involved in coordination with the metal. Compound I is studied by ¹H, ³¹C, and ¹⁵N NMR spectroscopy of a solution of the polymer complex in CD₃CN, and the most substantial difference in the chemical shifts of the bound and free Abp ligands is observed in the ¹⁵N NMR spectra (37 ppm). According to the data of luminescence spectroscopy, compounds I and II exhibit an emission in a range of 430–690 nm.

中文翻译：

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含2-氨基-5-溴吡啶的Cd（NO 3）2片段与配位聚合物和单体的合成，结构，NMR研究和发光性质

摘要

镉的反应（NO ₃）₂ ⋅4H ₂ ö与2-氨基-5-溴吡啶（Аbp）得到的化合物[CD（NO ₃）₂（Аbp）（H ₂ O）] _Ñ（我）和[CD（ NO ₃）₂（Abp）₂（H ₂ O）₂ ]（II）。两种配合物的结构均通过单晶X射线结构分析确定（CIF文件CCDC No. 1938624（I）和1959680（II））。化合物I是配位一维聚合物，其中两个螯合键\（{\ text {NO}} _ {3} ^ {-} \）团体充当桥梁。化合物I中八配位中心镉原子的配位多面体由七个氧原子（一个水原子含氧和\（{\ text {NO}} _ {3} ^ {-} \）六个原子组成）和Abp的一个氮原子，是三角形十二面体。络合物II是单核分子，其中Cd的八面体配位多面体由两个水分子的四个氧原子和两个\（{\ text {NO}} _ {3} ^ {-} \）和两个氧原子形成Abp周期的两个分子的数目。在两种络合物中，Abp的氨基均不参与与金属的配位。化合物I在¹ H，³¹ C和¹⁵在CD的聚合物复合物中的溶液氮NMR光谱₃ CN，并在结合和游离的ABP的化学位移的最显着差异是配位体所观察到的¹⁵ ÑNMR谱（37 ppm）表示。根据发光光谱数据，化合物I和II的发射范围为430-690 nm。