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Volumn 15, Issue 11, 1999, Pages 3782-3789

Dynamics of place-exchange reactions on monolayer-protected gold cluster molecules

Author keywords

[No Author keywords available]

Indexed keywords

ASSOCIATION REACTIONS; CHROMATOGRAPHIC ANALYSIS; INFRARED SPECTROSCOPY; MONOLAYERS; NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY; ORGANIC SOLVENTS; REACTION KINETICS; SOLUBILITY; SULFUR COMPOUNDS; SYNTHESIS (CHEMICAL);

EID: 0032630577     PISSN: 07437463     EISSN: None     Source Type: Journal    
DOI: 10.1021/la981598f     Document Type: Article
Times cited : (798)

References (43)
  • 14
    • 0345979435 scopus 로고    scopus 로고
    • (d) Ulman, A. Chem. Rev. 1996, 96, 1533-1554.
    • (1996) Chem. Rev. , vol.96 , pp. 1533-1554
    • Ulman, A.1
  • 27
    • 0344176921 scopus 로고    scopus 로고
    • note
    • The average diameter of the clusters used in this study is 2.1 nm; this comprises ca. 314 atoms in the gold core and 108 RS groups in the monolayer.
  • 28
    • 0032165952 scopus 로고    scopus 로고
    • 225 clusters were present. Because all samples were synthesized by identical procedures, we consider the reported rate differences to be real. Fractional precipitation can give monodisperse clusters, but obtaining large amounts of material is difficult. Work is in progress to isolate sufficient quantities of monodisperse clusters to explore the sensitivity of the rate of exchange to the size (and number of defects) of the gold core. For a more complete discussion of dispersity issues in MPC samples, see: Green, S. J.; Pietron, J. J.; Stokes, J. J.; Hostetler, M. J.; Vu, H.; Wuelfing, W. P.; Murray, R. W. Langmuir 1998, 14, 5612-5619.
    • (1998) Langmuir , vol.14 , pp. 5612-5619
    • Green, S.J.1    Pietron, J.J.2    Stokes, J.J.3    Hostetler, M.J.4    Vu, H.5    Wuelfing, W.P.6    Murray, R.W.7
  • 31
    • 0344608640 scopus 로고    scopus 로고
    • note
    • Placing the insoluble cluster in a concentrated solution of either alkanethiol or dialkyl disulfide does not regenerate a soluble cluster.
  • 38
    • 0345039610 scopus 로고    scopus 로고
    • note
    • 2CC11SH had entered and remained at reactive vertice and edge sites, then it would be reasonable to expect these ligands to be most susceptible to subsequent exchange. This was not observed. One explanation is that cluster-bound ligands can slowly migrate onto the terrace surfaces; experiments are in progress that should help verify this hypothesis.
  • 39
    • 0345470828 scopus 로고    scopus 로고
    • note
    • It is possible to fully exchange off all of the original ligands when the reaction is performed at room temperature; however, this was only observed with the C4 MPC. Longer protecting ligands proved highly resistant to full exchange.
  • 40
    • 0344608638 scopus 로고    scopus 로고
    • note
    • The concentration of the desorbing ligand was no more than 10% of the concentration of the remaining original incoming ligand.
  • 41
    • 0345039611 scopus 로고    scopus 로고
    • note
    • INIT, only a few ligands need to exchange in order to satisfy this condition.
  • 42
    • 0345470827 scopus 로고    scopus 로고
    • note
    • The quenching process took about 8 min, so it was not possible to take a satisfactory number of time points at the early stages of the reaction for the fastest reactions. It is sufficiently clear, however, that the exchange rate depends on the concentration of the incoming ligand.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.