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首页> 外文期刊>Polyhedron: The International Journal for Inorganic and Organometallic Chemistry >A methylenic group binds guanidinoacetic acid to glycine and serine in two novel copper(II) complexes: Synthesis, X-ray structure and spectroscopic characterization
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A methylenic group binds guanidinoacetic acid to glycine and serine in two novel copper(II) complexes: Synthesis, X-ray structure and spectroscopic characterization

机译：亚甲基将胍基乙酸与甘氨酸和丝氨酸结合成两种新型铜（II）配合物：合成，X射线结构和光谱表征

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摘要

New condensed amino acids were observed in two Cu(II) complexes, both involving guanidinoacetic acid (GAA). The copper(II) complexes, I and 2, were synthesized and characterized by X-ray crystallography and infrared spectroscopy. Vibrational assignments were performed with the aid of density functional theory (DFT) calculations. Both complexes present an elongation of the carbon chain of the starting amino acid, GAA. One methylenic group binds GAA to the other amino acid, which can be glycine or serine. Complex 1 presents a new condensed synthetic amino acid, glycine-3-N-methylguanidino acetic acid (Gly-mGAA) that is the result/product of the reaction between GAA and glycine, with an addition of one carbon in the chain. In complex 2, a similar ligand to Gly-mGAA was observed, but in this case it is a product of the reaction between GAA and serine, that is, serine-3-N-methylguanidino acetic acid (Ser-mGAA). Gly-mGAA and Ser-mGAA coordinate to Cu(II) through two nitrogen atoms and two oxygen atoms. In addition, we attempt to propose the mechanism for formation of Ser-mGAA and Gly-mGAA in two steps. The first one involves a deamidination reaction between two GAA species, producing the intermediate N,N'-guanidinodiacetic acid. The second step involves a decarboxylation process between GAA and Ser or Gly. (c) 2007 Elsevier Ltd. All rights reserved.
机译：在两个Cu（II）配合物中均观察到新的缩合氨基酸，两者均涉及胍基乙酸（GAA）。合成了铜（II）配合物I和2，并通过X射线晶体学和红外光谱对其进行了表征。借助密度泛函理论（DFT）计算来执行振动分配。两种复合物均显示出起始氨基酸GAA的碳链延长。一个亚甲基基团将GAA与另一个氨基酸结合，后者可以是甘氨酸或丝氨酸。配合物1呈现了一种新的缩合合成氨基酸，甘氨酸-3-N-甲基胍基乙酸（Gly-mGAA），它是GAA与甘氨酸之间反应的结果/产物，并且链中添加了一个碳。在配合物2中，观察到与Gly-mGAA相似的配体，但是在这种情况下，它是GAA和丝氨酸之间反应的产物，即，丝氨酸-3-N-甲基胍基乙酸（Ser-mGAA）。 Gly-mGAA和Ser-mGAA通过两个氮原子和两个氧原子与Cu（II）配位。此外，我们尝试分两个步骤提出形成Ser-mGAA和Gly-mGAA的机制。第一个涉及两个GAA物种之间的脱酰胺反应，产生中间体N，N'-胍基二乙酸。第二步涉及GAA与Ser或Gly之间的脱羧过程。 （c）2007 Elsevier Ltd.保留所有权利。

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