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首页> 外文期刊>Transition Metal Chemistry >The unusual thermodynamic stability order of the first-series transition metal complexes with N,N,N'-tri(2-pyridylmethyl)glycinamide and the crystal structure of the nickel(II)complex
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The unusual thermodynamic stability order of the first-series transition metal complexes with N,N,N'-tri(2-pyridylmethyl)glycinamide and the crystal structure of the nickel(II)complex

机译：具有N，N，N'-三（2-吡啶基甲基）甘氨酰胺的第一系列过渡金属配合物的异常热力学稳定性顺序和镍（II）配合物的晶体结构

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摘要

A new pentadentate tripodal peptide ligand N,N,N'-tri(2-pyridylmethyl)glycinamide(L)has been synthesized.The crystal structure of its nickel(II)complex,[NiL(H_2O)] centre dot 1.17ClO_4 centre dot 0.17H_3O centre dot 0.03H_2O(1),has been determined by X-ray diffraction.In the complex,the deprotonated ligand L acts in a pentadentate fashion and coordinates to the nickel(II)ion through five nitrogen atoms,while the sixth position is occupied by a water molecule.The units of the complex are connected as a 3D honeycomb network by intermolecular hydrogen bonds.The thermodynamic properties of the ligand L with the first-series transition metal ions Co(II),Ni(II),Cu(II)and Zn(II)have been investigated by potentiometric titration and the results show that the order of their stability constants does not conform to the Irving-Williams serial.The reason why the stability constants of the Cu(II)complex are unconventionally small is proposed.
机译：合成了一种新的五齿三脚体肽配体N，N，N'-三（2-吡啶甲基）甘氨酰胺（L）。其镍（II）配合物[NiL（H_2O）]中心点1.17ClO_4中心点的晶体结构通过X射线衍射确定了0.17H_3O中心点0.03H_2O（1）。在配合物中，去质子化的配体L以五齿形式起作用，并通过五个氮原子与镍（II）离子配位，而第六位分子间的氢键将络合物的单元连接成3D蜂窝网络。配体L与第一系列过渡金属离子Co（II），Ni（II），Cu的热力学性质电位滴定法研究了（II）和Zn（II）的稳定性常数的顺序不符合Irving-Williams序列。Cu（II）配合物的稳定常数之所以非常规建议小。

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