Silver(i) nanoclusters of carbazole-1,8-bis(acetylide): from visible to near-infrared emission

Abstract

High-nuclearity silver(i) nanoclusters of carbazole-1,8-bis(acetylide) exhibit visible to near-infrared luminescence and gradual emission spectral red-shift with the stepwise increase of cluster nuclearity following Ag8 → Ag16 → Ag29.

Scissor-like Au4Cu2 Cluster with Phosphorescent Mechanochromism and Thermochromism

“…Numerous alkyls or aryl acetylides linked d 10 homometallic or heterometallic clusters have been acquired and characterized by X-ray crystallography, showing intriguing luminescent properties and sensitive photophysical responses to external stimulus [ 22 , 23 , 24 , 25 ]. Considering that bis(ethynyl) ligands are more favorable for the formation of metal cluster architectures with folding and interpenetrating topologies to afford better molecular rigidity and a stronger emissive characteristic, we are devoted to the fabrication of d 10 metal cluster complexes using carbazole-functionalized bis(ethynyl) ligands as rigid sustaining or protective ligands [ 26 , 27 ]. Since diphosphines afford not only similar binding affinity to d 10 metal ions as that of bis(ethynyl) ligands to provide exceptional metal coordination architectures but also favor improving the solubility in organic solvents, they are a class of excellent co-ligands with carbazole-functionalized bis(ethynyl) compounds for the design of d 10 metal cluster topologies [ 26 , 27 ].…”

Heteroctanuclear Au4Ag4 Cluster Complexes of 4,5-Diethynylacridin-9-One with Luminescent Mechanochromism

“…Over the years, we have been devoted to the design of d 8 -d 10 and d 10 -d 10 heterometallic cluster complexes as phosphorescent materials for the use in solution-processed organic light-emitting diodes (OLEDs), taking advantage of aromatic acetylides as bridging ligands [ 24 ]. Recently, we are particularly interested in using rigid bis(acetylide) ligands for the preparation of a series of highly phosphorescent d 10 metal cluster complexes [ 25 , 26 ]. In this work, we report the preparation, structure, photophysical property, and remarkable luminescent mechanochromism of two heteroctanuclear Au 4 Ag 4 cluster complexes of 4,5-diethynylacridin-9-one (H 2 L).…”

Construction of Silver Clusters Capped by Zwitterionic Ethynide Ligands

“…Silver ethynide clusters have attracted great interest due to their fantastic structures and potential applications. − However, compared with their analogous thiolated silver clusters, the development of silver ethynide clusters has been lagging. − The easily available thiol ligands with different sizes, structures, and properties promote the booming advancement of thiolated silver clusters. − Among them, there is a class of zwitterionic thiol ligands for the extensive synthesis of hydrophilic metal clusters, , while similar zwitterionic ethynide ligands have not yet been explored. The zwitterionic molecule has both cationic and anionic groups − and possesses an electric dipole moment within the molecule, which has an important impact on the self-assembly process of the cluster .…”