Synthesis, characterization, guest inclusion, and photophysical studies of gold nanoparticles stabilized with carboxylic acid groups of organic cavitands

Barnali Mondal, Nareshbabu Kamatham, Shampa R. Samanta, Pradeepkumar Jagadesan, Jibao He, V. Ramamurthy

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

Water-soluble gold nanoparticles (AuNP) stabilized with cavitands having carboxylic acid groups have been synthesized and characterized by a variety of techniques. Apparently, the COOH groups similar to thiol are able to prevent aggregation of AuNP. These AuNP were stable either as solids or in aqueous solution. Most importantly, these cavitand functionalized AuNP were able to include organic guest molecules in their cavities in aqueous solution. Just like free cavitands (e.g., octa acid), cavitand functionalized AuNP includes guests such as 4,4′-dimethylbenzil and coumarin-1 through capsule formation. The exact structure of the capsular assembly is not known at this stage. Upon excitation there is communication between the excited guest present in the capsule and gold atoms and this results in quenching of phosphorescence from 4,4′-dimethylbenzil and fluorescence from coumarin-1.

Original languageEnglish (US)
Pages (from-to)12703-12709
Number of pages7
JournalLangmuir
Volume29
Issue number41
DOIs
StatePublished - Oct 15 2013

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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