A 2D Layer Network Assembled from an Open Dendritic Silver Cluster Cl@Ag11N24 and an N-donor Ligand
Fruitful efforts have been made for the assembly of nanosized silver clusters, the majority of which are protected by thiolates and alkynyl ligands. By comparison, the reported silver clusters or silver-cluster-based supramolecular networks protected by N-donor ligands are very rare because of the hard basicity of N-donor ligands with respect to the soft acid Ag(I). Here, by using an N-donor ligand, a 2D Cl@Ag11N24-based supramolecular network [Cl@Ag11(L)8X2 ]n (X = CF3COO- for 1, NO3- for 2 and CF3SO3- for 3) has been constructed with Ag-O bond as the linker. This high-nuclearity silver cluster Cl@Ag11N24 features an open dendritic structure with a high coordination ratio of N atom, which is different from the well-established macrocycle, spheroidal cage and core-shell architectures based on silver-thiolate/alkynyl/phosphine clusters. The stability and assembly process of the 2D network has been studied by high-resolution electrospray mass spectrometry (HR-ESI-MS). Notably, 1 shows an intriguing dual-emission feature that is strongly influenced by different excitation wavelengths and temperatures. Significantly, this work shed new lights into constructing novel silver clusters and supramolecular networks based on them and provides a kind of luminescent material.