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Pillar[5]arene‐Stabilized Silver Nanoclusters: Extraordinary Stability and Luminescence Enhancement Induced by Host–Guest Interactions
Authors:Madathumpady Abubaker Habeeb Muhammed  Laila Khalil Cruz  Abdul‐Hamid Emwas  Ahmed M El‐Zohry  Basem Moosa  Omar F Mohammed  Niveen M Khashab
Abstract:Herein, we report the synthesis of a new class of functional silver nanoclusters (AgNCs) capped with pillar5]arene (P5)‐based host ligands. These NCs are readily prepared through direct synthesis or ligand exchange synthesis and are stable at room temperature for over 4 months. The pillar5]arene‐stabilized NCs (Ag29(LA‐P5)12(TPP)2) endorse reversible host–guest interactions with neutral alkylamines and cationic quaternary ammonium guests. This results in the formation of spherical assemblies with unparalleled changes in their optical properties including an astonishing circa 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.
Keywords:Molekulare Erkennung  Nanocluster  Pillararene  Sensoren  Wirt-Gast-Chemie
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