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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Coordinatively- and electronically-unsaturated square planar cobalt(III) complexes of a pyridine dianionic pincer ligand
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Coordinatively- and electronically-unsaturated square planar cobalt(III) complexes of a pyridine dianionic pincer ligand

机译:吡啶Dianionic钳子配体的协调和电子 - 不饱和方形平面钴(III)复合物

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摘要

A series of low-valent Co(III) square planar complexes supported by a dianionic pincer ligand bis(aryl-amido) pyridine ([NNN](2-)) was synthesized, including the first structurally characterized square planar hydroxide complex ([NNN] Co(OH), 4) of a 3d transition metal in the +3 oxidation state. The magnetic properties of the Co(III) complexes were highly dependent on the charge of the complex and on the coordination environment of the metal. The diamagnetic cationic complex {[NNN] Co(py)}B-4 (2) can be converted to neutral paramagnetic complexes [NNN] Co(OR) (R = Ph 3a, iPr 3b, and H 4) by a simple substitution of the ancillary pyridine ligand in 2. The double bond character between the metal and the anilido nitrogen was evident from short Co-N2,3 bond lengths in the solid-state structures, and further supported by density functional theory calculations. Complex 2 showed well-behaved redox processes at -0.93 and +0.70 V assigned to Co-II/III and [NNN](2-/1-) redox couples, respectively. In contrast, both complexes 3a and 4 showed some irreversibility in redox processes on either cobalt or ligands.
机译:由Dianionic钳子配体BIS(芳基-MIDO)吡啶([NNN](2-))负载的一系列低价CO(III)平面络合物被合成,包括第一结构表征方形平面氢氧化物复合物([NNN在+3氧化态中的3D过渡金属的CO(OH),4)。 CO(III)配合物的磁性高度依赖于复合物的电荷和金属的配位环境。通过简单的取代,可以将抗磁阳离子复合物{[NNN] CO(PY)} B-4(2)转化为中性顺磁性复合物[NNN] CO(或)(或)(r = pH 3a,ipr 3b和h 4)在辅助吡啶配体中。金属和苯胺氮之间的双键特征从固态结构中的短CO-N2,3键长明显明显,并且通过密度官能理论计算进一步支持。复合物2在-0.93和+0.70 v分配到Co-II / III和[NNN](2- / 1-)氧化还原伴侣的氧化还原过程中表现出良好的氧化还原过程。相反,复合物3a和4均在钴或配体上显示氧化还原方法的一些不可逆性。

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