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- W2070921224 abstract "This study reports the Raman (FT-Raman) and absorption infrared (FT-IR) spectra, based on calculated wavenumbers and normal modes of vibrations, of the following compounds: l-Leu-d-NH-CH(Me)-PO3H2 (LI), l-Leu-NH-C(Me)2-PO3H2 (LII), l-Leu-d-NH-CH(Et)-PO3H2 (LIII), l-Leu-l-NH-CH(Et)-PO3H2 (LIV), l-Leu-l-NH-CH(EtOH)-PO3H2 (LV), l-Leu-NH-C(Me)(Et)-PO3H2 (LVI), l-Leu-l-NH-CH(PrA)-PO3H2 (LVII), l-Leu-l-NH-CH(c-Pr)-PO3H2 (LVIII), l-Leu-l-NH-CH(t-Bu)-PO3H2 (LIX), l-Leu-l-NH-CH(BuA)-PO3H2 (LX), l-Leu-l-NH-CH(c-Bu)-PO3H2 (LXI), and l-Leu-l-NH-C(Adm)-PO3H2 (LXII). The equilibrium geometries and vibrational wavenumbers were calculated using density functional theory (DFT) at the B3LYP, 6-311++G** level using Gaussian 03, Raint, GaussSum 0.8, and Gar2ped software. We briefly compare and analyze the experimental and calculated vibrational wavenumbers in the range 4000–400 cm–1. In addition, the Raman wavenumbers are compared to those from the surface-enhanced Raman scattering (SERS) spectra for the phosphono analogues of l-leucine (l-Leu) adsorbed on a colloidal silver surface in an aqueous solution. The geometries of these molecules etched on the silver surface were deduced from observed changes in both the intensity and broadness of Raman bands in the spectra of the bound versus free species. For example, LVI appears to adsorb onto the colloidal silver particles mainly through the amine group and amide bond, which assists in the adsorption process, whereas LII shows strongly enhanced SERS bands due to the rocking, twisting, and stretching vibrations of the NamidCsg(Me)2P fragment, suggesting that this peptide’s interaction with the silver surface occurs mainly via this fragment. On the other hand, the most dominant SERS bands of LIII and LIV due to the P═O bond stretches reflect P═O···Ag complex formation." @default.
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- W2070921224 date "2011-09-19" @default.
- W2070921224 modified "2023-10-17" @default.
- W2070921224 title "Vibrational Characterization of <scp>l</scp>-Leucine Phosphonate Analogues: FT-IR, FT-Raman, and SERS Spectroscopy Studies and DFT Calculations" @default.
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- W2070921224 doi "https://doi.org/10.1021/jp207101m" @default.
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