Year
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(Peer-Reviewed) Water molecules bonded to the carboxylate groups at the inorganic-organic interface of an inorganic nanocrystal coated with alkanoate ligands
Jiongzhao Li 李炯昭, Weicheng Cao 曹伟成, Yufei Shu 舒宇飞, Haibing Zhang, Xudong Qian 钱旭东, Xueqian Kong 孔学谦, Linjun Wang 王林军, Xiaogang Peng 彭笑刚
Zhejiang Key Laboratory of Excited-State Materials, Department of Chemistry, Zhejiang University, Hangzhou 310027, China 浙江大学 化学系 浙江省激发态材料合成与应用重点实验室
National Science Review, 2021-08-04
Abstract

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.
Water molecules bonded to the carboxylate groups at the inorganic-organic interface of an inorganic nanocrystal coated with alkanoate ligands_1
Water molecules bonded to the carboxylate groups at the inorganic-organic interface of an inorganic nanocrystal coated with alkanoate ligands_2
Water molecules bonded to the carboxylate groups at the inorganic-organic interface of an inorganic nanocrystal coated with alkanoate ligands_3
Water molecules bonded to the carboxylate groups at the inorganic-organic interface of an inorganic nanocrystal coated with alkanoate ligands_4
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