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首页> 外文期刊>Inorganic Chemistry Communications >Copper(II) and nickel(II) complexes of pyridylamido hexadentate ligands: chemical speciation and spectroscopic studies
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Copper(II) and nickel(II) complexes of pyridylamido hexadentate ligands: chemical speciation and spectroscopic studies

机译：吡啶乙酰胺基六齿配体的铜（II）和镍（II）配合物：化学形态和光谱研究

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摘要

Two novel potentially hexadentate ligands, 1,10-(2-bis picolinamide)-4,7-diazadecane (pycdpnen) and 1,8-bis(2-picolinamide)-3,6-dioxaoctane (pycdado) have been synthesised as their hydrochloride sa its protonation constants and the stability constants of the copper(II) and nickel(II) chelates have been determined by potentiometry. Amide groups deprotonation permits the formation of [MLH_(-1)]~+ species in all cases, while only pycdado gives [MLH_(-2)] species. THe solid complexes of copper and nickel with the neutral and the deprotonated ligands have been synthesised and characterised by IR, UV-Vis and ESR spectroscopy. The amidic groups are coordinated through the oxygen atoms in all solid complexes [ML](ClO_4)_2 (M=Cu~(2+) and Ni~(2+). The complexes obtained with the deprotonated forms of the ligands imply the coordinated through the nitrogen atoms of the amidic groups.
机译：合成了两个新颖的潜在六齿配体，即1,10-（2-bis吡啶啉）-4,7-二氮杂十二烷（pycdpnen）和1,8-bis（2-picolinamide）-3,6-二氧杂辛烷（pycdado）盐酸盐它的质子化常数以及铜（II）和镍（II）螯合物的稳定性常数已通过电位法确定。酰胺基团的去质子化在所有情况下都允许形成[MLH _（-1）]〜+物种，而只有pycdado可以提供[MLH _（-2）]物种。铜和镍与中性和去质子化的配体的固体配合物已经合成，并通过红外，紫外-可见和ESR光谱进行了表征。酰胺基团通过所有固体配合物[ML]（ClO_4）_2（M = Cu〜（2+）和Ni〜（2+））中的氧原子进行配位，配体的去质子化形式得到的配合物暗示了通过酰胺基的氮原子。

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