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, Vaidhyanathan Ramamurthy

Research output: Contribution to journalArticle

12 Citations (Scopus)

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

Fingerprint

capsules
Carboxylic Acids
Carboxylic acids
carboxylic acids
Gold
Capsules
inclusions
gold
Nanoparticles
aqueous solutions
Phosphorescence
nanoparticles
synthesis
phosphorescence
Sulfhydryl Compounds
thiols
Quenching
Agglomeration
assembly
communication

ASJC Scopus subject areas

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

Cite this

Synthesis, characterization, guest inclusion, and photophysical studies of gold nanoparticles stabilized with carboxylic acid groups of organic cavitands. / Mondal, Barnali; Kamatham, Nareshbabu; Samanta, Shampa R.; Jagadesan, Pradeepkumar; He, Jibao; Ramamurthy, Vaidhyanathan.

In: Langmuir, Vol. 29, No. 41, 15.10.2013, p. 12703-12709.

Research output: Contribution to journalArticle

Mondal, Barnali ; Kamatham, Nareshbabu ; Samanta, Shampa R. ; Jagadesan, Pradeepkumar ; He, Jibao ; Ramamurthy, Vaidhyanathan. / Synthesis, characterization, guest inclusion, and photophysical studies of gold nanoparticles stabilized with carboxylic acid groups of organic cavitands. In: Langmuir. 2013 ; Vol. 29, No. 41. pp. 12703-12709.
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