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首页> 外文期刊>Polyhedron: The International Journal for Inorganic and Organometallic Chemistry >Synthesis, structure, and electrochemistry of pyridinecarboxamide cobalt(III) complexes; the effect of bridge substituents on the redox properties
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Synthesis, structure, and electrochemistry of pyridinecarboxamide cobalt(III) complexes; the effect of bridge substituents on the redox properties

机译:吡啶甲酰胺钴(III)配合物的合成,结构和电化学桥取代基对氧化还原性能的影响

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Two series of complexes of the types trans-[Co-III(Mebpb)(amine)(2)]ClO4 [Mebpb(2-) = N,N-bis(pyridine-2carboxamido)-4-methylbenzene dianion, and annine = pyrrolidine (prldn) (1a), piperidine (pprdn) (2a), morpholine (mrpln) (3a), benzylamine (bzlan) (4a)), and trans-[Co-III(cbpb)(amine)(2)]X {cbpb(2-) = N,N-bis(pyridine-2-carboxamido)-4-chlorobenzene dianion, and arnine = pyrrolidine (prldn), X = PF6 (1b), piperidine (pprdn), X = PF6 (2b), morpholine (mrpln), X = ClO4 (3b), benzylamine (bzlan), X = PF6 (4b)) have been synthesized and characterized by elemental analyses, IR, UV-Vis, and H-1 NMR spectroscopy. The crystal structure of la has been determined by X-ray diffraction. The electrochemical behavior of these complexes, with the goal of evaluating the effect of axial ligation and equatorial substitution on the redox properties, is also reported. The reduction potential of Co-III, ranging from -0.53 V for (1a) to -0.31 V for (3a) and from -0.48 V for (1b) to -0.22 V for (3b) show a relatively good correlation with the sigma-donor ability of the axial ligands. The methyl and chloro substituents of the equatorial ligand have a considerable effect on the redox potentials of the central cobalt ion and the ligand-centered redox processes. (C) 2008 Elsevier Ltd. All rights reserved.
机译:反式-[Co-III(Mebpb)(胺)(2)] ClO4类型的两个系列配合物[Mebpb(2-)= N,N-双(吡啶-2甲酰胺基)-4-甲基苯二阴离子和年金=吡咯烷(prldn)(1a),哌啶(pprdn)(2a),吗啉(mrpln)(3a),苄胺(bzlan)(4a))和反式-[Co-III(cbpb)(胺)(2)] X {cbpb(2-)= N,N-双(吡啶-2-甲酰胺基)-4-氯苯二阴离子,而arnine =吡咯烷(prldn),X = PF6(1b),哌啶(pprdn),X = PF6( 2b)合成了吗啉(mrpln),X = ClO4(3b),苄胺(bzlan),X = PF6(4b)),并通过元素分析,IR,UV-Vis和H-1 NMR光谱进行了表征。 la的晶体结构已经通过X射线衍射确定。还报道了这些络合物的电化学行为,目的是评估轴向连接和赤道取代对氧化还原性能的影响。 Co-III的还原电位从(1a)的-0.53 V到(3a)的-0.31 V以及(1b)的-0.48 V到(3b)的-0.22 V都显示出与sigma相对较好的相关性-轴向配体的供体能力。赤道配体的甲基和氯取代基对中心钴离子的氧化还原电势和以配体为中心的氧化还原过程具有重要影响。 (C)2008 Elsevier Ltd.保留所有权利。

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