메뉴 건너뛰기




Volumn 19, Issue 11, 2007, Pages 2831-2841

Synthesis and chiroptical study of D/L-penicillamine-capped silver nanoclusters

Author keywords

[No Author keywords available]

Indexed keywords

AMINES; DICHROISM; ELECTROPHORESIS; ENANTIOMERS; SILVER; SYNTHESIS (CHEMICAL);

EID: 34250214986     PISSN: 08974756     EISSN: None     Source Type: Journal    
DOI: 10.1021/cm0700192     Document Type: Article
Times cited : (117)

References (65)
  • 9
    • 0342819025 scopus 로고
    • Iljima, S. Nature 1991, 354, 56.
    • (1991) Nature , vol.354 , pp. 56
    • Iljima, S.1
  • 22
  • 24
    • 34250202479 scopus 로고    scopus 로고
    • SAXS measurements were conducted with a Rigaku ATX diffractometer with Cu Ka irradiation using a rotating anode X-ray generator
    • (c) SAXS measurements were conducted with a Rigaku ATX diffractometer with Cu Ka irradiation using a rotating anode X-ray generator.
  • 25
    • 17144403270 scopus 로고    scopus 로고
    • The SAXS analyses are based on the assumption that spherical nanoclusters are distributed with the simple Γ-distribution function, so that an obtainable size distribution might come from a deviation from the ideal spherical shape of small clusters. The relatively broad size dispersion of compound 7 comes from a diffusive cluster distribution in the separating gel. However, note that it may be possible to have a small size distribution in the fractioned gel band; for example, it is reported that Au10(SG) 10, Au11(SG)11, and Au12-(SG) 12 appeared in a single gel band, where SG denotes the glutathione ligand Negishi, Y, Nobusada, K, Tsukuda, T. J. Am. Chem. Soc. 2005, 127, 5261
    • 12 appeared in a single gel band, where SG denotes the glutathione ligand (Negishi, Y.; Nobusada, K.; Tsukuda, T. J. Am. Chem. Soc. 2005, 127, 5261).
  • 29
    • 34250196775 scopus 로고    scopus 로고
    • In compounds 4-6, featureless absorption spectra were obtained. To distinctly show the trend in spectroscopic properties as a function of size, we have selected compound 5 as representative of the three. Ordinary absorption and CD responses (anisotropy factor) of 4 and 6 are shown in the Supporting Information.
    • In compounds 4-6, featureless absorption spectra were obtained. To distinctly show the trend in spectroscopic properties as a function of size, we have selected compound 5 as representative of the three. Ordinary absorption and CD responses (anisotropy factor) of 4 and 6 are shown in the Supporting Information.
  • 30
    • 34250217376 scopus 로고    scopus 로고
    • L, but the obtained mean cluster diameter fluctuated from 0.4 to 1.5 nm.
    • L, but the obtained mean cluster diameter fluctuated from 0.4 to 1.5 nm.
  • 33
    • 34250173755 scopus 로고    scopus 로고
    • Precisely, a surface charge density of penicillamine-capped metal nanoclusters depends not only on the number of ligands but also on an average charge per ligand. The latter can be changed through the interaction of the charged groups in the molecule with the metal surface. Therefore, if such interactions are different between gold and silver, the difference in the average charge per ligand may contribute to that in the surface charge density
    • (b) Precisely, a surface charge density of penicillamine-capped metal nanoclusters depends not only on the number of ligands but also on an average charge per ligand. The latter can be changed through the interaction of the charged groups in the molecule with the metal surface. Therefore, if such interactions are different between gold and silver, the difference in the average charge per ligand may contribute to that in the surface charge density.
  • 34
    • 0345979435 scopus 로고    scopus 로고
    • (a) Ulman, A. Chem. Rev. 1996, 95, 1533.
    • (1996) Chem. Rev , vol.95 , pp. 1533
    • Ulman, A.1
  • 47
    • 17144403270 scopus 로고    scopus 로고
    • It has been demonstrated that monolayer-protected gold nanoclusters differing by one ligand can be separated using PAGE; in this case, absorption spectra of the two separated compounds showed the same absorption onset (Negishi, Y, Nobusada, K, Tsukuda, T. J. Am. Chem. Soc. 2005, 127, 5261, Using similar arguments, it is quite reasonable that compound 1 has a different (and smaller) core size fthan those of the other numbered compounds
    • It has been demonstrated that monolayer-protected gold nanoclusters differing by one ligand can be separated using PAGE; in this case, absorption spectra of the two separated compounds showed the same absorption onset (Negishi, Y.; Nobusada, K.; Tsukuda, T. J. Am. Chem. Soc. 2005, 127, 5261). Using similar arguments, it is quite reasonable that compound 1 has a different (and smaller) core size fthan those of the other numbered compounds.
  • 49
  • 50
    • 34250204828 scopus 로고    scopus 로고
    • In compound 2, the position of the absorption onset remains unchanged with the passage of time. See the Supporting Information.
    • In compound 2, the position of the absorption onset remains unchanged with the passage of time. See the Supporting Information.
  • 59
    • 34250221991 scopus 로고    scopus 로고
    • +) and 1.90 (for COOH).
    • +) and 1.90 (for COOH).
  • 60
    • 0037071985 scopus 로고    scopus 로고
    • It has been elucidated that conformation of the carboxylate group is readily changeable through Cα-Cβ bond rotation at highly acidic conditions (Brolo, A. G, Germain, P, Hager, G. J. Phys. Chem. B 2002, 106, 5982, We then tried to measure chiroptical responses of the silver nanoclusters at a highly acidic condition (pH ∼2) to check the effect of surface penicillamine rotamers. Unfortunately, the extracted silver nanoclusters were very unstable and formed agglomerates, so we could not measure any optical properties at that pH
    • β bond rotation at highly acidic conditions (Brolo, A. G.; Germain, P.; Hager, G. J. Phys. Chem. B 2002, 106, 5982). We then tried to measure chiroptical responses of the silver nanoclusters at a highly acidic condition (pH ∼2) to check the effect of surface penicillamine rotamers. Unfortunately, the extracted silver nanoclusters were very unstable and formed agglomerates, so we could not measure any optical properties at that pH.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.