Preparation of Ethylene-Bridged Bis(amidine) Ligands as Precursors for Multinuclear, Blue-Green Emissive Copper Complexes
Disciplines
Chemistry | Inorganic Chemistry
Abstract (300 words maximum)
Multinuclear Group 11 clusters, specifically those that incorporate copper as the first choice of a cheap precursor coinage metal, have attracted considerable interest within in the past decade, since they facilitate closed-shell metal MI···MI (d10···d10) interactions (M = Cu, Ag, Au). The fascinating luminescence properties of these multinuclear complex assemblies lead to applications as powerful building blocks for molecular/organic light-emitting diodes (OLEDs). Polydentate ligands that are capable of accommodating defined linear arrangements of CuI and CuII ions are of particular interest in this regard, as they can also serve as potentially conducting molecular wires in nanoelectronics.
Our concept features a series of new polydentate bis(amidine) ligands LH2 with a sterically protected flexible backbone. It has recently been demonstrated that such a ligand undergoes with mesitylcopper, a powerful synthon for a variety of unusual CuI frameworks, a clean conversion into two simultaneously crystallizing CuI complexes [L2Cu4] and [L4Cu8] that show blue (λmax = 460 nm; [L2Cu4]) or green (λmax = 495 nm; [L4Cu8]) light emissions in excellent quantum yields.
We are now focusing on subtle modifications of the aromatic substituents on the bis(amidinate) framework that allow systematic structural changes of the resulting [LCu2]n clusters and fine-tuning of their emission properties.
Academic department under which the project should be listed
CSM - Chemistry and Biochemistry
Primary Investigator (PI) Name
Michael Stollenz
Additional Faculty
Sanjay Dutta, SCM - Chemistry and Biochemistry, sdutta4@kennesaw.edu
Tomasz Kruczynski, SCM - Chemistry and Biochemistry, tkruczyn@kennesaw.edu
Preparation of Ethylene-Bridged Bis(amidine) Ligands as Precursors for Multinuclear, Blue-Green Emissive Copper Complexes
Multinuclear Group 11 clusters, specifically those that incorporate copper as the first choice of a cheap precursor coinage metal, have attracted considerable interest within in the past decade, since they facilitate closed-shell metal MI···MI (d10···d10) interactions (M = Cu, Ag, Au). The fascinating luminescence properties of these multinuclear complex assemblies lead to applications as powerful building blocks for molecular/organic light-emitting diodes (OLEDs). Polydentate ligands that are capable of accommodating defined linear arrangements of CuI and CuII ions are of particular interest in this regard, as they can also serve as potentially conducting molecular wires in nanoelectronics.
Our concept features a series of new polydentate bis(amidine) ligands LH2 with a sterically protected flexible backbone. It has recently been demonstrated that such a ligand undergoes with mesitylcopper, a powerful synthon for a variety of unusual CuI frameworks, a clean conversion into two simultaneously crystallizing CuI complexes [L2Cu4] and [L4Cu8] that show blue (λmax = 460 nm; [L2Cu4]) or green (λmax = 495 nm; [L4Cu8]) light emissions in excellent quantum yields.
We are now focusing on subtle modifications of the aromatic substituents on the bis(amidinate) framework that allow systematic structural changes of the resulting [LCu2]n clusters and fine-tuning of their emission properties.