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(CCPh)(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.