Synthesis, spectroscopic and EPR results and crystal structure of copper(II) formato derivatives with pyrazine and dimethylpyrazines

Barquin M; Garmendia MJG; Larrinaga L; Pinilla E; Torres MR

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Synthesis, spectroscopic and EPR results and crystal structure of copper(II) formato derivatives with pyrazine and dimethylpyrazines

机译：吡嗪和二甲基吡嗪类铜（II）甲酸酯衍生物的合成，光谱和EPR结果及晶体结构

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The complexes of copper formato with pyrazine and dimethylpyrazines: Cu(HCOO)(2)(pyrz) (1), Cu-2(HCOO)(4)(pyrz) (2), Cu-2(HCOO)(4)(2,3-Me2pyrz) (3), Cu-2(HCOO)(4)(2,5-Me(2)pyrz) (4), and Cu-2(HCOO)(4)(2,6-Me(2)pyrz)(2) (5) have been synthesized and characterized by chemical analysis and IR and electronic spectroscopies. The three-dimensional structure of compound I consists of -Cu-pyrz-Cu-pyrz- chains joined by bridging formate groups coordinated, in configuration syn-anti, to two copper atoms. The coordination around the copper atom is orthorhombic with two Cu-O distances of 2.374(1) angstrom, two Cu-O of 1.952 angstrom and two Cu-N of 2.080 angstrom. Compound 5 is formed by molecular dimers with the [Cu-2(mu-HCOO)(4)] unit, two copper atoms and four syn-syn fomate groups, and two ligands coordinated to the copper atoms in the axial positions. In compounds 2 and 3 chains Of [CU2(mu-HCOO)(4)] dimers with pyrz or 2,3-Me(2)pyrz as bridging ligands are formed.The EPR signal of I is orthorhombic (g = 2.23, 2.20 and 2.06). In the EPR spectra of 2 - 5 compounds the triplet (S = 1) signals are observed. The g(perpendicular to), g(parallel to) and D values are been calculated.

机译：甲format铜与吡嗪和二甲基吡嗪的配合物：Cu（HCOO）（2）（pyrz）（1），Cu-2（HCOO）（4）（pyrz）（2），Cu-2（HCOO）（4）（ 2,3-Me2pyrz）（3），Cu-2（HCOO）（4）（2,5-Me（2）pyrz）（4）和Cu-2（HCOO）（4）（2,6-Me （2）pyrz）（2）（5）已合成并通过化学分析，红外光谱和电子光谱表征。化合物I的三维结构由-Cu-pyrz-Cu-pyrz-链组成，该链通过桥接以顺反构型配位至两个铜原子的甲酸酯基团连接。铜原子周围的配位是正交的，两个Cu-O距离为2.374（1）埃，两个Cu-O距离为1.952埃，两个Cu-N距离为2.080埃。化合物5由具有[Cu-2（mu-HCOO）（4）]单元的分子二聚体，两个铜原子和四个顺式-同型膦酸酯基团以及两个配体在轴向位置与铜原子配位而形成。在化合物2和3中，形成具有pyz或2,3-Me（2）pyrz作为桥连配体的[CU2（mu-HCOO）（4）]二聚体链。I的EPR信号是正交的（g = 2.23，2.20和2.06）。在2-5种化合物的EPR光谱中，观察到三重态（S = 1）信号。计算出g（垂直于），g（平行于）和D值。

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《Zeitschrift fur Anorganische und Allgemeine Chemie》 |2005年第11期|共5页
作者
Barquin M; Garmendia MJG; Larrinaga L; Pinilla E; Torres MR;
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正文语种 eng
中图分类化学;
关键词
copper; formato; pyrazine; dimethylpyrazine; dimers; chain of dimers; crystal structure; EPR spectroscopy; EXCHANGE; ACETATE; DIMER;

机译：铜;甲酰;吡嗪;二甲基吡嗪;二聚体;二聚体链;晶体结构;EPR光谱;交换;乙酰基;二聚体;

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Synthesis, spectroscopic and EPR results and crystal structure of copper(II) formato derivatives with pyrazine and dimethylpyrazines

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