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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Versatile coordination modes of bis[5-(2-pyridine- 2-yl)-1,2,4-triazole-3-yl]alkanes in Cu(II) complexes
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Versatile coordination modes of bis[5-(2-pyridine- 2-yl)-1,2,4-triazole-3-yl]alkanes in Cu(II) complexes

机译：Cu [II]配合物中双[5-（2-吡啶-2-基）-1,2,4-三唑-3-基]烷烃的多能配位模式

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Nine new mononuclear and polynuclear Cu(II) complexes [Cu(H_2L~2)Cl]Cl?3H_2O (1), [Cu(H_2L~3)Cl]Cl?H_2O (2), [Cu(H_2L~4)Cl]Cl?2.5H_2O (3), [Cu_3(μ~3-L~1)_2(H_2O)_3](ClO_4)_2?H_2O (4), [Cu_4(μ-HL~1)_4](ClO_4)_8?CH_3OH?5H_2O (5), [Cu_2(HL~3)_2](ClO_4)_2?2H_2O (6a), [Cu_2(μ-HL~3)_2](ClO_4)_2?H_2O (6b), [Cu_2(μ-HL~3)(L~3)Cu(teta)](ClO_4)_3?2H_2O (7) and [Cu_2(H_2L~3)2(ox)](ClO_4)_2?2H_2O?2MeOH (8) containing [5-(2-pyridine-2-yl)-1,2,4-triazole-3-yl]alkanes (H_2L~n, n = 1–4) in combination with other ligands, such as chlorido, aqua, triethylenetetramine (teta) and/ or oxalato (ox~(2?)), were synthesized and characterized by various techniques such as elemental analysis, FTIR, NMR and UV-Vis spectroscopy. X-ray structures of H_2L~3 and H_2L~4 as well as complexes 1–8 were determined. The X-ray structures revealed that relatively small composition and structural changes in the H_2L~n ligands have a substantial impact on the coordination geometries of the complexes themselves as well as on their resulting magnetic properties. It has been found that the geometries of the complexes vary from square-pyramidal to trigonal-bipyramidal (with τ ranging from 0.00 to 0.96) and, moreover, that the trigonal bipyramidal geometry becomes more preferable with the increase in the length of the polymethylene chain within the corresponding H_2L~n ligand. The magnetic properties of the polynuclear compounds 4, 5, 6, 7 and 8 were analysed using the spin Hamiltonian formalism, which revealed the presence of antiferromagnetic exchange in the polynuclear systems mediated by the title ligands. The significant effect of the geometric parameters on the Cu?Cu exchange interactions in the polynuclear complexes is discussed.
机译：九种新的单核和多核Cu（II）络合物[Cu（H_2L〜2）Cl] Cl？3H_2O（1），[Cu（H_2L〜3）Cl] Cl？H_2O（2），[Cu（H_2L〜4）Cl ] Cl？2.5H_2O（3），[Cu_3（μ〜3-L〜1）_2（H_2O）_3]（ClO_4）_2？H_2O（4），[Cu_4（μ-HL〜1）_4]（ClO_4） _8？CH_3OH？5H_2O（5），[Cu_2（HL〜3）_2]（ClO_4）_2？2H_2O（6a），[Cu_2（μ-HL〜3）_2]（ClO_4）_2？H_2O（6b），[ Cu_2（μ-HL〜3）（L〜3）Cu（teta）]（ClO_4）_3？2H_2O（7）和[Cu_2（H_2L〜3）2（ox）]（ClO_4）_2？2H_2O？2MeOH（8 ）含有[5-（2-吡啶-2-基）-1,2,4-三唑-3-基]烷烃（H_2L〜n，n = 1-4）与其他配体（如氯基，水合成了三亚乙基四胺（teta）和/或草酸（ox〜（2？）），并通过各种技术进行了表征，例如元素分析，FTIR，NMR和UV-Vis光谱。确定了H_2L〜3和H_2L〜4以及配合物1–8的X射线结构。 X射线结构表明，H_2L〜n配体中相对较小的组成和结构变化对配合物本身的配位几何结构及其所产生的磁性均具有实质性影响。已经发现，配合物的几何形状从方锥到三角双锥（τ范围为0.00至0.96）不等，而且，随着聚亚甲基链长度的增加，三角双锥几何变得更优选。在相应的H_2L〜n配体中。使用自旋哈密顿方程对多核化合物4、5、6、7和8的磁性进行了分析，揭示了在多核系统中由标题配体介导的反铁磁交换的存在。讨论了几何参数对多核配合物中Cu-Cu交换相互作用的重大影响。

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