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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Bis-bidentate vs,bis-tridentate imino-heterocycle ligands in the formation of dinuclear helical complexes of Fe(II)
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Bis-bidentate vs,bis-tridentate imino-heterocycle ligands in the formation of dinuclear helical complexes of Fe(II)

机译：Fe（II）双核螺旋络合物形成中的双双与双三齿亚氨基杂环配体

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摘要

By reaction of the bis-bidentate imino-quinoline ligand 1 with the octahedral cation Fe2 in a 3:2 metal/ligand molar ratio,a partial hydrolysis of the ligands is observed instead of the formation of the expected triple helicate,duc to the excessive crowding of the trans-l,2-cyclohexy1 spacers.The monomeric [Fe~II(2)_2]~(2+)complex is obtained,whose crystal and molecular structure have been determined,in which the amino-imino-qumoline tridentate ligands 2,originating from 1 by loss of one quinoline aldehyde,coordinate Fe~(2+)with a mer disposition.Double helical complexes can instead be obtained by using the bis-tridentate ligand 3,featuring the same spacer of ligand 1,ie.trans-l,2-cyclohexyl,and two imino-phenanthroline donor sets.The spectral and electrochemical properties of the low-spin double helical [Fe~II_2(3)_2]~(4+)complex have been studied and compared with those of the low spin [Fe~II(4)]~(2+)complex,which can be considered the monomeric half of the helicate.Significantly enhanced kinetic inertness and resistance to oxidation were found for the double helical complex.
机译：通过双齿亚氨基喹啉配体1与八面体阳离子Fe2以3：2金属/配体摩尔比反应，观察到配体部分水解，而不是形成预期的三螺旋，导致过量反式-1,2-环己基1间隔子的拥挤。获得单体[Fe〜II（2）_2]〜（2+）的配合物，确定其晶体和分子结构，其中氨基亚氨基-喹啉三齿通过失去一个喹啉醛从1开始形成配体2，配位为Fe〜（2+），并带有mer配位。可以使用双三齿配体3获得双螺旋配合物，其特征是与配体1具有相同的间隔基，即.trans-1,2-环己基和两个亚氨基菲咯啉供体。研究了低旋转双螺旋[Fe〜II_2（3）_2]〜（4+）配合物的光谱和电化学性质，并与之比较。低自旋[Fe〜II（4）]〜（2+）络合物的那些，可以认为是螺旋结构的单体一半。双螺旋络合物具有更高的动力学惰性和抗氧化性。

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