An Alkynyl‐Stabilized Pt5Ag22 Cluster Featuring a Two‐Dimensional Alkynyl–Platinum “Crucifix Motif”

The “staple motif” has been widely applied to depict and predict the structures of thiolate or alkynyl‐protected gold nanoclusters. By contrast, the composition, dimensions, configuration, and functionality of the platinum‐ligand motif has remained completely unknown. Herein, we report the synthesis and crystal structure of a novel luminescent Pt5Ag22(C≡CPh)32 (1) cluster, in which two‐dimensional and two‐functional alkynyl–platinum “crucifix motif” was observed. Such a crucifix motif with one Pt center and four alkynyl groups in the same plane acts as a two‐dimensional unit in the cluster and functions as both a protective cover and an intermediate joint.