Speciation of Copper(II)‐Betaine Complexes as Starting Point for Electrochemical Copper Deposition from Ionic Liquids,ChemistryOpen

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Speciation of Copper(II)‐Betaine Complexes as Starting Point for Electrochemical Copper Deposition from Ionic Liquids
ChemistryOpen ( IF 2.5 ) Pub Date : 2020-12-01 , DOI: 10.1002/open.202000231
Janine Richter ₁ , Maximilian Knies ₁ , Michael Ruck _{1,

2}

Affiliation

The application of ionic liquids for the dissolution of metal oxides is a promising field for the development of more energy‐ and resource‐efficient metallurgical processes. Using such solutions for the production of valuable chemicals or electrochemical metal deposition requires a detailed understanding of the chemical system and the factors influencing it. In the present work, several compounds are reported that crystallize after the dissolution of copper(II) oxide in the ionic liquid [Hbet][NTf₂]. Dependent on the initial amount of chloride, the reaction temperature and the purity of the reagent, copper crystallizes in complexes with varying coordination geometries and ligands. Subsequently, the influence of these different complex species on electrochemical properties is shown. For the first time, copper is deposited from the ionic liquid [Hbet][NTf₂], giving promising opportunities for more resource‐efficient copper plating. The copper coatings were analyzed by SEM and EDX measurements. Furthermore, a mechanism for the decomposition of [Hbet][NTf₂] in the presence of chloride is suggested and supported by experimental evidence.

中文翻译：

铜(II)-甜菜碱配合物的形态作为离子液体电化学铜沉积的起点

应用离子液体溶解金属氧化物是开发能源和资源效率更高的冶金工艺的一个有前景的领域。使用此类解决方案生产有价值的化学品或电化学金属沉积需要详细了解化学系统及其影响因素。在目前的工作中，报道了几种在氧化铜(II)溶解在离子液体[Hbet][NTf ₂ ]中后结晶的化合物。根据氯化物的初始量、反应温度和试剂纯度，铜会结晶成具有不同配位几何形状和配体的络合物。随后，显示了这些不同的复合物种类对电化学性能的影响。首次从离子液体 [Hbet][NTf ₂ ] 中沉积铜，为更资源高效的镀铜提供了有希望的机会。通过 SEM 和 EDX 测量对铜涂层进行分析。此外，还提出了[Hbet][NTf ₂ ]在氯化物存在下分解的机制，并得到了实验证据的支持。

更新日期：2020-12-01

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