Bis(1,2,6,7-tetracyano-3,5-dihydro-3,5-diiminopyrrolizinido) complexes of iron and cobalt: properties, crystal structures and interaction with dioxygen
作者:Mario Bonamico、Vincenzo Fares、Alberto Flamini、Nicola Poli
DOI:10.1039/dt9920003273
日期:——
complexes reveal that they are both high-spin species (S= 2 and , respectively) with antiferromagnetic superexchange interactions, which are stronger when M = Co. The optical spectra of both sets of complexes are very similar to those of corresponding metal phthalocyanines. Also, both can be chemically oxidized by using O2 as oxidant in MeCN solution to give insoluble polymeric species, corresponding analytically
配体1,2,6,7-四氰基-3,5-二氢-3,5-二亚氨基吡咯嗪化物[ML 2 ]· n A(M = Fe 1或Co 2 ; A =结晶描述)。对于A = 1,2-二甲氧基乙烷(dme),n = 2,该化合物为同构和同构,如晶体结构测定所示。中心金属原子位于对称中心,在配体赤道平面内以方形排列配位四个亚氨基,并完成其八面体,四边形扭曲的MN eq 4 N ax 2。具有两个晶体学上等效的复杂分子的两个轴向氰基的配位几何。两种结构之间的唯一显着差异仅限于M–N键距[Fe–N eq 2.090(5); Fe-N系列斧2.295(5); Co–N当量2.017(5); CO-N斧2.369(5)]。对这两种配合物的可变温度磁性测量表明,它们都是具有高反铁磁性超交换相互作用的高自旋物种(分别为S = 2和S),当M = Co时,它们更强。两组配合物的光谱非常相似相应的金属酞菁。而且,两者都可以通过使用O
Metal Atom Lability in Polynuclear Complexes
作者:Emily V. Eames、Raúl Hernández Sánchez、Theodore A. Betley
DOI:10.1021/ic302694y
日期:2013.5.6
revealed that the Co atom(s) substitute(s) into the oxidized dimetalunit ([M2]5+), while the M2+ site remains iron-substituted. Magnetic data acquired for the series are consistent with this analysis revealing the oxidized dimetalunit comprises a strongly coupled S = 1 unit ([FeCo]5+) or S = 1/2 ([Co2]5+) that is weakly antiferromagnetically coupled to the high spin (S = 2) ferrous site. The kinetic pathway
不对称氧化产物 [( Ph L)Fe 3 (μ-Cl)] 2 [ Ph LH 6 = MeC(CH 2 NHPh- o -NHPh) 3 ],其中每个三核核心由氧化的二铁单元 [Fe 2 ] 5+和一个孤立的三角锥体亚铁位点,与 MCl 2盐反应以提供 ( Ph L) 2 Fe 6 M(μ-Cl) 4 (thf) 2类型的七核桥接结构,其中 M = Fe 或 Co。零场,57Fe Mössbauer 分析显示 Co 位于三核核心亚基内,而不是位于八面体、卤化物桥接的 MCl 4 (thf) 2位置,表明 Co 迁移到三核亚基中。[( Ph L)Fe 3 (μ-Cl)] 2与 CoCl 2(2 或 5 当量)反应,然后通过加入乙腈沉淀,得到三核产物,其中一个或两个铁可以分别在三核核内被取代. 金属原子取代经1 H NMR, 57Fe Mossbauer、单晶 X 射线衍射、X 射线荧光和磁力分析。光谱分析表明,Co
Davies, Sian C.; Evans, David J.; Hughes, David L., Journal of the Chemical Society. Dalton Transactions (2001), 2002, # 12, p. 2473 - 2482
作者:Davies, Sian C.、Evans, David J.、Hughes, David L.、Konkol, Martin、Richards, Raymond L.、Sanders, J. Roger、Sobota, Piotr