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Water molecules bonded to the carboxylate groups at the inorganic-organic interface of an inorganic nanocrystal coated with alkanoate ligands
National Science Review ( IF 20.6 ) Pub Date : 2021-07-30 , DOI: 10.1093/nsr/nwab138
Jiongzhao Li 1 , Weicheng Cao 1 , Yufei Shu 1 , Haibing Zhang 1 , Xudong Qian 1 , Xueqian Kong 1 , Linjun Wang 1 , Xiaogang Peng 1
Affiliation  

High-quality colloidal nanocrystals are commonly synthesized in hydrocarbon solvents with alkanoates as the most common organic ligands. Water molecules with approximately equal number of the surface alkanoate ligands are identified at the inorganic-organic interface for all types of colloidal nanocrystals studied, which is investigated quantitatively using CdSe nanocrystals as the model system. Carboxylate ligands are coordinated to the surface metal ions and the first monolayer of the water molecules are found to bond to the carboxylate groups of alkanoate ligands through hydrogen bonds. Additional monolayer(s) of water molecules can further be adsorbed through hydrogen bonds to the first monolayer of water molecules. The nearly ideal environment for hydrogen bonding at the inorganic-organic interface of alkanoate-coated nanocrystals helps to rapidly and stably enrich the interface-bonded water molecules, most of which are difficult to be removed through vacuum treatment, thermal annealing, and chemical drying. The water-enriched structure of the inorganic-organic interface of high-quality colloidal nanocrystals must be taken into account for understanding synthesis, processing, and properties of these novel materials.

中文翻译:

水分子在涂有链烷酸酯配体的无机纳米晶体的无机-有机界面处与羧酸酯基团键合

高质量的胶体纳米晶体通常在烃类溶剂中合成,链烷酸酯是最常见的有机配体。对于所研究的所有类型的胶体纳米晶体,在无机-有机界面处鉴定出具有大致相等数量的表面链烷酸酯配体的水分子,使用 CdSe 纳米晶体作为模型系统对其进行定量研究。羧酸盐配体与表面金属离子配位,发现水分子的第一单层通过氢键与链烷酸盐配体的羧酸盐基团键合。额外的水分子单层可以进一步通过氢键吸附到第一单层水分子上。在链烷酸酯涂层纳米晶体的无机-有机界面处几乎理想的氢键环境有助于快速稳定地富集界面键合的水分子,其中大部分难以通过真空处理、热退火和化学干燥去除。为了理解这些新型材料的合成、加工和性能,必须考虑高质量胶体纳米晶体的无机-有机界面的富水结构。
更新日期:2021-07-30
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