메뉴 건너뛰기




Volumn 24, Issue 6, 2008, Pages 2759-2766

Chiral functionalization of optically inactive monolayer-protected silver nanoclusters by chiral ligand-exchange reactions

Author keywords

[No Author keywords available]

Indexed keywords

CHIRALITY; ELECTRON TRANSITIONS; GEL PERMEATION CHROMATOGRAPHY; LIGANDS; MONOLAYERS; SILVER;

EID: 42149101991     PISSN: 07437463     EISSN: None     Source Type: Journal    
DOI: 10.1021/la703351p     Document Type: Article
Times cited : (75)

References (51)
  • 3
    • 0032568887 scopus 로고    scopus 로고
    • Chen, S.; Ingram, R. S.; Hostetler, M. J.; Pietron, J. J.; Murray, R. W.; Schaaff, T. G.; Khoury, J. T.; Alvarez, M. M.; Whetten, R. L. Science (Washington, DC, U.S.) 1998, 280, 2098.
    • (a) Chen, S.; Ingram, R. S.; Hostetler, M. J.; Pietron, J. J.; Murray, R. W.; Schaaff, T. G.; Khoury, J. T.; Alvarez, M. M.; Whetten, R. L. Science (Washington, DC, U.S.) 1998, 280, 2098.
  • 27
    • 42149146505 scopus 로고    scopus 로고
    • Silver nanoclusters to be fractioned strongly absorb UV light at 365 nm due to the metal-based electronic transitions, so the irradiated light cannot pass through the lanes (bands) of silver nanoclusters in the plate gel. On the other hand, the residual light can pass through the gel and excite a fluorescent screen. Then, the lanes containing silver nanoclusters make shadows on the screen.
    • Silver nanoclusters to be fractioned strongly absorb UV light at 365 nm due to the metal-based electronic transitions, so the irradiated light cannot pass through the lanes (bands) of silver nanoclusters in the plate gel. On the other hand, the residual light can pass through the gel and excite a fluorescent screen. Then, the lanes containing silver nanoclusters make "shadows" on the screen.
  • 28
    • 0033514121 scopus 로고    scopus 로고
    • 3) (Stiger, R. M.; Gorer, S.; Craft, B.; Penner, R. M. Langmuir 1999, 15, 790).
    • 3) (Stiger, R. M.; Gorer, S.; Craft, B.; Penner, R. M. Langmuir 1999, 15, 790).
  • 29
    • 15844386157 scopus 로고    scopus 로고
    • Taking the silver core as a sphere with the bulk density covered with an outermost layer of close-packed silver atoms (13.92 atoms/nm2; this value can be estimated from the radius of a silver atom 0.144 nm, the cores of 1 and 2 contain ∼36 and ∼68 Ag atoms, of which ∼25 and ∼45 atoms lie on the nanocluster surface, respectively. Note that, for the estimation of the number of surface atoms, the skin is taken as the center of the outermost silver atoms Terrill, R. H, Postlethwaite, T. A, Chen, C.-h, Poon, C.-D, Terzis, A, Chen, A, Hutchison, J. E, Clark, M. R, Wignall, G, Londono, J. D, Superfine, R, Falvo, M, Johnson, C. S, Jr, Samulski, E. T, Murray, R. W. J. Am Chem. Soc, 1995, 117, 12537
    • 2; this value can be estimated from the radius of a silver atom 0.144 nm), the cores of 1 and 2 contain ∼36 and ∼68 Ag atoms, of which ∼25 and ∼45 atoms lie on the nanocluster surface, respectively. Note that, for the estimation of the number of surface atoms, the skin is taken as the center of the outermost silver atoms (Terrill, R. H.; Postlethwaite, T. A.; Chen, C.-h.; Poon, C.-D.; Terzis, A.; Chen, A.; Hutchison, J. E.; Clark, M. R.; Wignall, G.; Londono, J. D.; Superfine, R.; Falvo, M.; Johnson, C. S., Jr.; Samulski, E. T.; Murray, R. W. J. Am Chem. Soc., 1995, 117, 12537).
  • 30
    • 0033902206 scopus 로고    scopus 로고
    • 2) (Mohtat, N.; Byloos, M.; Soucy, M.; Morin, S.; Morin, M. J. Electroanal. Chem. 2000, 484, 120; this packing density was calculated for the Ag(111) surface), 1 and 2 would have 9-10 and 16-17 thiol molecules on their surface, respectively.
    • 2) (Mohtat, N.; Byloos, M.; Soucy, M.; Morin, S.; Morin, M. J. Electroanal. Chem. 2000, 484, 120; this packing density was calculated for the Ag(111) surface), 1 and 2 would have 9-10 and 16-17 thiol molecules on their surface, respectively.
  • 35
    • 42149147104 scopus 로고    scopus 로고
    • To further demonstrate the spectral differences, absorption spectra of the nanocluster compounds (ID/IL/WIDSO/ILSO) were normalized at around 255 nm and compared with each other. See the Supporting Information for more detail.
    • To further demonstrate the spectral differences, absorption spectra of the nanocluster compounds (ID/IL/WIDSO/ILSO) were normalized at around 255 nm and compared with each other. See the Supporting Information for more detail.
  • 37
    • 42149125297 scopus 로고    scopus 로고
    • Actually, the fractioned bands 1eD/1eL and 2eD/2eL were somewhat diffusive, indicating that the qualities of these compounds were relatively poor as compared to those of the corresponding normally prepared samples. Hence, we carefully cut the lanes of 1eD/1eL and 2eD/2eL as sharp and similar as possible to the other cases, b In addition, we conducted field-emission scanning transmission electron microscopy (FE-STEM) for the D-Pen-exchanged compounds 1eD and 2eD. Unfortunately, clear images could not be obtained probably due to the very small size and high reactivity of the clusters under the electron-beam irradiation, but we confirmed that there was no size growth in these compounds
    • eD. Unfortunately, clear images could not be obtained probably due to the very small size and high reactivity of the clusters under the electron-beam irradiation, but we confirmed that there was no size growth in these compounds.
  • 40
    • 42149175282 scopus 로고    scopus 로고
    • In ref 21a, it was reported that cysteine-capped silver nanoparticles were decomposed to form gray precipitates under highly acidic conditions pH < 3
    • (b) In ref 21a, it was reported that cysteine-capped silver nanoparticles were decomposed to form gray precipitates under highly acidic conditions (pH < 3).
  • 41
    • 33749599105 scopus 로고    scopus 로고
    • Although this detail of the decomposition mechanism is not clear at present, it is probably due to a high chemical reactivity of small silver nanoclusters in the reaction with hydrochloric acid, which might produce silver chloride Li, L, Zhu, Y.-J. J. Colloid Interface Sci. 2006, 303, 415
    • (c) Although this detail of the decomposition mechanism is not clear at present, it is probably due to a high chemical reactivity of small silver nanoclusters in the reaction with hydrochloric acid, which might produce silver chloride (Li, L.; Zhu, Y.-J. J. Colloid Interface Sci. 2006, 303, 415.)
  • 42
    • 42149189206 scopus 로고    scopus 로고
    • When the absorption of the supernatant solution was used for the calibration, we failed to obtain the relationship probably because the solution still contained the running buffer components and thus interfered with the appropriate estimation
    • When the absorption of the supernatant solution was used for the calibration, we failed to obtain the relationship probably because the solution still contained the running buffer components and thus interfered with the appropriate estimation.
  • 43
    • 42149165254 scopus 로고    scopus 로고
    • Calibration curve (relationship between ee and CD/Abs values) was carefully examined for 2 2D/2L/2D50/2 L50, Although a linear relationship could be obtained, the slopes of the regression line were different between 2D/2D50 and 2L/2L50 series. See the Supporting Information for details. However, by using the respective calibration curve for the D- or L-Pen-exchanged samples, we estimated the reasonable enantiomeric excess of 2eD or 2eL to be ∼48 or ∼59% ee, respectively
    • eL to be ∼48 or ∼59% ee, respectively.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.