High photoluminescence from self-assembled Ag2Cl2(dppe)(2) clusters through metallophilic interactions

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Bootharaju, Megalamane S.; Lee, Sanghwa; Deng, Guocheng; Chang, Hogeun; Baek, Woonhyuk; Hyeon, Taeghwan

Issue Date
American Institute of Physics
Journal of Chemical Physics, Vol.155 No.1, p. 014307
Ligand protected metal nanoclusters (NCs) are an emerging class of functional materials with intriguing photophysical and chemical properties. The size and molecular structure play an important role in endowing NCs with characteristic optical and electronic properties. Modulation of these properties through the chemical reactivity of NCs is largely unexplored. Here, we report on the synthesis of self-assembled Ag2Cl2(dppe)(2) clusters through the ligand-exchange-induced transformation of [Pt2Ag23Cl7(PPh3)(10)] NCs [(dppe): 1,2-bis(diphenylphosphino)ethane; (PPh3): triphenylphosphine]. The single crystal x-ray structure reveals that two Ag atoms are bridged by one dppe and two Cl ligands, forming a Ag2Cl2(dppe) cluster, which is subsequently self-assembled through dppe ligands to form [Ag2Cl2(dppe)(2)](n). Importantly, the Ag2Cl2(dppe)(2) cluster assembly exhibits high photoluminescence quantum yield: similar to 18%, which is attributed to the metallophilic interactions and rigidification of the ligand shell. We hope that this work will motivate the exploitation of the chemical reactivity of NCs as a new path to attain cluster assemblies endowed with enhanced photophysical properties. Published under an exclusive license by AIP Publishing.
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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