Self-Assembly of A Novel Ag48 Cluster Encapsulating an Unprecedented [Mo8O28]8- Anion Template

A novel silver cluster (SD/Ag48a) co-protected by p-MePhS- and CF3COO- ligands with an in-situ generated unprecedented [Mo8O28](8-) template has been synthesized under solvothermal condition. Single-crystal X-ray diffraction (SCXRD) and electrospray mass spectrometry (ESI-MS) were used to determine the atom-precise structure and solution behavior, respectively. Interestingly, the rare [Mo8O28](8-) ion observed in the center of SD/Ag48a consists of 8 edge-shared {MoO6} octahedra or can be deemed as three {Mo4O4} cubes fused together by sharing faces. The UV-Vis spetcrum exhibits that a high-energy (HE) wide absorption centered at ca. 365nm, which can be assinged to intraligand (IL) * transition absorption, whereas the low-energy (LE) shoulder peak centered at ca. 500nm can be ascribed to ligand-to-metal-charge-transfer (LMCT, S 3pAg 5s) transition.