Pillararene Stabilized Silver Nanoclusters: Immense Stability and Luminescence Enhancement Induced by Host-Guest Interactions.
Emwas, Abdul-Hamid M.
Mohammed, Omar F.
Khashab, Niveen M.
KAUST DepartmentAdvanced Membranes and Porous Materials Research Center
Chemical Science Program
KAUST Solar Center (KSC)
Physical Science and Engineering (PSE) Division
Smart Hybrid Materials (SHMs) lab
Smart Hybrid Materials Laboratory (SHMs), Advanced Membranes and Porous Materials Center, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
Ultrafast Laser Spectroscopy and Four-dimensional Electron Imaging Research Group
Embargo End Date2020-08-29
Permanent link to this recordhttp://hdl.handle.net/10754/656671
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AbstractHerein, we report the synthesis of a new class of functional silver nanoclusters (AgNCs) capped with pillararene (P5) based host ligands. These NCs are readily prepared via direct synthesis or ligand exchange synthesis and are stable at room temperature for over 4 months. The pillararene stabilized NCs (Ag29(LA-P5)12(TPP)2) endorse reversible host-guest interactions with neutral alkylamines and cationic quaternary ammonium guests. This results into the formation of spherical assemblies with unparalleled changes in their optical properties including an astonishing ≈2000-fold luminescence enhancement. This is the highest luminescence enhancement ratio reported so far for such atomically precise NCs. Our synthetic protocol paves the way for the preparation of a new generation of metal nanoclusters protected by macrocyclic ligands with molecular recognition and selectivity toward specific guests.
CitationMuhammed, M., cruz, laila, Emwas, A.-H., El-Zohry, A., Moosa, B., Mohammed, O., & Khashab, N. (2019). Pillararene Stabilized Silver Nanoclusters: Immense Stability and Luminescence Enhancement Induced by Host-Guest Interactions. Angewandte Chemie International Edition. doi:10.1002/anie.201906740
SponsorsWe would like to acknowledge Dr.Dalaver Anjum from KAUST Core Labs for HRTEM measurements.