标题：[Ag-48(C (CBu)-Bu-t)(20)(CrO4)(7)]: An Atomically Precise Silver Nanocluster Co-protected by Inorganic and Organic Ligands
作者：Zhang, Shan-Shan; Alkan, Fahri; Su, Hai-Feng; Aikens, Christine M.; Tung, Chen-Ho; Sun, Di
作者机构：[Zhang, Shan-Shan; Tung, Chen-Ho; Sun, Di] Shandong Univ, Minist Educ, Sch Chem & Chem Engn, State Key Lab Crystal Mat,Key Lab Colloid & Inter, Jinan 更多
通讯作者：Sun, D;Aikens, CM;Aikens, Christine M
通讯作者地址：[Sun, D]Shandong Univ, Minist Educ, Sch Chem & Chem Engn, State Key Lab Crystal Mat,Key Lab Colloid & Inter, Jinan 250100, Shandong, Peoples R China;[ 更多
来源：JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
摘要：The elaborate selection of capping ligands is of great importance in the synthesis of atomically precise metal nanoclusters. Organic thiolates, alkynyls, phosphines, and/or their combinations are the ligands most widely utilized to protect metal nanoclusters, while inorganic oxo anions have been almost neglected in this field. Herein, the first CrO42-/(BuC)-Bu-t C- co-capped Ag-48 nanocluster (SD/Ag48, SD = SunDi) was synthesized and structurally characterized by single-crystal X-ray diffraction. The pseudo-5-fold symmetric metal skeleton of SD/Ag48 shows a core shell structure composed of a Ag-23 cylinder encircled by an outer Ag-25 shell. Unprecedentedly, coexistence of inorganic (CrO42-) and organic ((BuC)-Bu-t C-) ligands was observed on the surface of SD/Ag48. The inorganic CrO42- anion plays three important roles in the construction of silver nanoclusters: (i) passivating the Ag-23 kernel; (ii) connecting the core and shell; and (iii) protecting the Ag-25 shell. This nanocluster belongs to a 14e superatom system and exhibits successive molecule-like absorption bands from the visible to the ultraviolet region. This work not only establishes a fresh inorganic ligand strategy in the synthesis of silver nanoclusters but also provides a new insight into the important surface coordination chemistry of CrO42- in the shape control of silver nanoclusters.