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首页> 外文期刊>European journal of mass spectrometry >Influence of solvent and counter ion on copper complexes with N-alkyl-pyridine-2- carboxamides as studied by electrospray ionization mass spectrometry
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Influence of solvent and counter ion on copper complexes with N-alkyl-pyridine-2- carboxamides as studied by electrospray ionization mass spectrometry

机译：电喷雾电离质谱研究溶剂和抗衡离子对N-烷基-吡啶-2-羧酰胺与铜配合物的影响

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摘要

The interactions of copper(II) with N-alkyl-pyridine-2- carboxamides (M) were studied by electrospray ionization mass spectrometry. The influence of solvent and counter ion (Cl–, ClO4–) on the type of ions (complexes) observed was discussed. By cone voltage increase, the fragmentation “in source” of the ions discussed was achieved. In methanol solution containing N-alkyl-pyridine-2-carboxamide (M) and CuCl2 the singly- and doubly charged-ions [M + CuCl]+ and [M2 + Cu]+2 were detected. In acetonitrile solution containing N-alkyl-pyridine-2-carboxamide and CuCl2, the copper(I)-containing ions [M + CH3CN+Cu]+ were formed. The use of Cu(ClO4)2 instead of CuCl2 resulted in more abundant doubly-charged ions in both methanol and acetonitrlile solutions and, for the former solution, the ions containing methoxyl anion, namely [M + CuOCH3]+, were observed. When water was used as a solvent, the abundant ions corresponding to the protonated ligands were formed, while the ions corresponding to copper complexes were characterised by low abundances.
机译：通过电喷雾电离质谱法研究了铜（II）与N-烷基-吡啶-2-羧酰胺（M）的相互作用。讨论了溶剂和抗衡离子（Cl–，ClO4–）对观察到的离子（络合物）类型的影响。通过锥电压的增加，实现了所讨论离子的“源内”碎裂。在含有N-烷基吡啶-2-甲酰胺（M）和CuCl2的甲醇溶液中，检测到单电荷和双电荷离子[M + CuCl] +和[M2 + Cu] +2。在含有N-烷基-吡啶-2-甲酰胺和CuCl2的乙腈溶液中，形成了含铜（I）的离子[M + CH3CN + Cu] +。使用Cu（ClO4）2代替CuCl2可以在甲醇和乙腈溶液中产生更丰富的双电荷离子，对于前一种溶液，观察到含有甲氧基的离子，即[M + CuOCH3] +。当水用作溶剂时，形成了对应于质子化配体的大量离子，而对应于铜络合物的离子则具有低丰度的特征。

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