A potential septadentate ligand
A potential septadentate ligand
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潜在的七齿配体
DOI：
10.1071/ch9681365
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发表时间：
1968
期刊：
影响因子：
--
通讯作者：
Dj Robinson
中科院分区：
文献类型：
--
作者：
J. Broomhead;Dj Robinson
新的铁（@）配合物是一种强烈的紫红色细结晶固体，不溶于水和乙醇，但微溶于硝基甲烷、乙腈、氯仿、硝基苯或硫烷，得到深红色的溶液。乙腈中的吸收光谱由两个主要谱带组成，每个谱带都有分裂的迹象。吸收最大值（mp）和消光系数（cm- 1）。摩尔- 1（括号内）分别为：515 (5880),435sh (3830), 325 (14600), 295sh（13700）。Gouy法测得磁化率值为5.9 BM，表明铁处于高自旋态。虽然这与铁（111）在高配位数配合物中的其他例子是一致的，但低配位数也会产生这里观察到的力矩。有趣的是，Hoard et aL4的x射线工作证实了[Fe (OH,) Y]阴离子（Y=乙二胺四乙酸酯）中的七配位，其中铁是高自旋（六元）。有关trensaliron （1n）配合物的分隔配位的化学证据是模棱两可的。铁络合物的强烈颜色在稀硫酸中很快被破坏。红色氯仿溶液同样可以通过与稀盐酸摇晃来立即脱色，六烷基铁（1n）被提取到酸中。这些观察结果表明酸催化分解是现成的。质子化很可能发生在酚氧或
DiscussionThe new iron (@ complex is an intense purple-red finely crystalline solid insoluble in water and ethanol, but slightly soluble in nitromethane, acetonitrile, chloroform, nitrobenzene, or sulpholane to give claret-red solutions. The absorption spectrum in acetonitrile consists of two main bands each showing evidence of splitting. Absorption maxima (mp) and extinction coefficients (cm-l 1. mole-I in parentheses) are as follows: 515 (5880), 435sh (3830), 325 (14600), 295sh (13700). Magnetic susceptibility measurements by the Gouy method give a value of 5.9 BM, thus showing the iron to be in the high-spin state. Though this is consistent with other examples of iron (111) in complexes of higher coordination number, lower coordination numbers could also produce the moment observed here. It is interesting that the X-ray work of Hoard et aL4 has confirmed seven-coordination in the [Fe (OH,) Y] anion (Y= ethylenediaminetetraacetate) in which the iron is high spin (sextet). Chemical evidence concerning septacoordination for the trensaliron (1n) complex is equivocal. The intense colour of the iron complex is quickly destroyed in dilute sulphuric acid. Red chloroform solutions are likewise immediately decolorized by shaking with dilute hydrochloric acid, and the hexaaquoiron (1n) species is extracted into the acid. These observations indicate ready acid-catalysed decomposition. Protonation most probably would occur at the phenolic oxygens or