Abstract

Two new dimeric copper (II) complexes containing 2-chlorobenzoato/4-formylbenzoato and 4-cyanopyridine ligands, [Cu₂(μ₂-O₂CC₆H₄-Cl)₄(C₅H₄N-CN)₂] (1) and [Cu₂(μ₂-O₂CC₆H₄-CHO)₄(C₅H₄N-CN)₄] (2), were synthesized and characterized by elemental analysis, FT-IR and ESR spectroscopy and single-crystal X-ray diffraction methods. In the structure of 1, each copper^II cation was surrounded by four oxygen atoms from four different carboxylate of four 2-chlorobenzoate molecules and one nitrogen atom of one 4-cyanopyridine ligand. In the crystal structure of 2, each copper^II cation was coordinated by four oxygen atoms from one chelating and two bridging 4-formylbenzoate anions and two nitrogen atoms of two 4-cyanopyridine ligands. C–H···O and C–H···Cl hydrogen bonds (for 1) and C–H···O hydrogen bonds and weak C–H···π interactions (for 2) further stabilize the crystal structures. The linear optical absorption characterizations of the complexes were performed by using UV-Vis spectrophotometer. The results obtained from the linear absorption spectra of the complexes observed that these complexes can be used for optical filtration among nearly 600 and 950 nm wavelengths for concentrations which are higher than 4 g/L.

Synopsis

Two new dimeric copper (II) complexes were synthesized. The complexes were characterized by elemental analysis, FT-IR and ESR spectroscopy and single-crystal X-ray diffraction methods. [Cu₂(μ₂-O₂CC₆H₄-Cl)₄(C₅H₄N-CN)₂] (1) has a paddle-wheel structure unit. [Cu₂(μ₂-O₂CC₆H₄-CHO)₄(C₅H₄N-CN)₄] (2) has an unusual and unique conformation. The linear optical absorption characterizations of the complexes were investigated. According to the results obtained from the linear absorption spectra of the complexes, these complexes can be used for optical filtration among nearly 600 and 950 nm wavelengths for concentrations which are higher than 4 g/L.

中文翻译：

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芳基羧酸铜（II）与4-氰基吡啶的二聚体配合物：合成，结构表征和线性吸收性质

摘要

两个新的二聚铜（II）含有2- chlorobenzoato / 4-formylbenzoato和4-氰基吡啶配体的络合物，[铜₂（μ ₂ -O ₂ CC ₆ H ^ ₄ -Cl）₄（C ₅ H ^ ₄ N-CN）₂ ] （1）和[铜₂（μ ₂ -O ₂ CC ₆ H ^ ₄ -CHO）₄（C ₅ H ^ ₄ N-CN）₄ ]（2通过元素分析，FT-IR和ESR光谱以及单晶X射线衍射方法进行合成和表征。在1的结构中，每个铜^II阳离子被来自四个2-氯苯甲酸酯分子的四个不同羧酸盐的一个氧原子和一个4-氰基吡啶配体的一个氮原子包围。在2的晶体结构中，每个铜^II阳离子由一个螯合和两个桥连的4-甲酰基苯甲酸酯阴离子中的四个氧原子和两个4-氰基吡啶配体中的两个氮原子配位。C–H···O和C–H···Cl氢键（对于1）和C–H···O氢键和弱的C–H···π相互作用（对于2）进一步稳定晶体结构。通过使用UV-Vis分光光度计进行络合物的线性光学吸收表征。从配合物的线性吸收光谱获得的结果观察到，对于高于4 g / L的浓度，这些配合物可用于近600和950 nm波长之间的光学过滤。

概要

合成了两种新的二聚铜（II）配合物。通过元素分析，FT-IR和ESR光谱以及单晶X射线衍射方法对络合物进行表征。[铜₂（μ ₂ -O ₂ CC ₆ H ^ ₄ -Cl）₄（C ₅ H ^ ₄ N-CN）₂ ]（1）具有一个桨轮结构单元。[铜₂（μ ₂ -O ₂ CC ₆ H ^ ₄ -CHO）₄（C ₅ H ^ ₄ N-CN）₄]（2）具有不同寻常且独特的构象。研究了配合物的线性光吸收特性。根据从配合物的线性吸收光谱获得的结果，这些配合物可用于在近600和950 nm波长之间进行光学过滤，且浓度高于4 g / L。