scholarly journals Exploring the Isomer Dependent SERS Spectra of (diphenylphosphoryl)(pyridin-2, -3, and -4-yl)methanol Adsorbed on Gold Nanocolloids

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Ewa Pięta ◽  
Edyta Proniewicz ◽  
Bogdan Boduszek ◽  
Tomasz K. Olszewski ◽  
Younkyoo Kim ◽  
...  
Keyword(s):  
Nitrogen Atom ◽  
Adsorption Process ◽  
Gold Surface ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Ring Nitrogen ◽  
Derivatives Of ◽  
Ring Nitrogen Atom ◽  
Surface Changes

The surface-enhanced Raman scattering (SERS) spectra of three aminophosphonate derivatives of pyridine: (diphenylphosphoryl)(pyridin-2-yl)methanol (α-Pyr), (diphenylphosphoryl)(pyridin-3-yl)methanol (β-Pyr), and (diphenylphosphoryl)(pyridin-4-yl)methanol (γ-Pyr) were measured after immobilization onto colloidal gold surface. Changes in the wavenumber, broadness, and enhancement between the corresponding Raman and SERS bands allowed to deduce orientation of theα-,β-, andγ-isomers (α-,β-, andγ-refer to the position of the substituent relative to the ring nitrogen atom) of aminophosphonate derivatives of pyridine on the gold surface. Briefly, it was demonstrated that theα-Pyr andβ-Pyr show the same mode of adsorption, whereas the adsorption process of theγ-Pyr isomer differs in this regard that pyridine assists in the interaction with the gold surface.

Übergangsmetallkomplexe mit Nitroxidradikalen: Palladium-, Platin-, Pentamethylcyclopentadienyl-rhodium- und -iridium-Komplexe sowie α-Aminocarboxylatkomplexe mit Donor-haltigen Derivaten des 2,5-Dihydroimidazol-l-oxyls / Transition Metal Complexes of Nitroxide Radicals, Palladium, Platinum, Pentamethylcyclopentadienyl Rhodium and Iridium Complexes, and α-Aminocarboxylate Complexes with Derivatives of 2,5-Dihydroimidazole-l-oxyls

1998 ◽  
Vol 53 (1) ◽  
pp. 101-109 ◽  
Author(s):  
Frank Hintermaier ◽  
Sylvia Helding ◽  
Leonid B. Volodarsky ◽  
Karlheinz Sünkel ◽  
Kurt Polbom ◽  
...  
Keyword(s):  
Nitrogen Atom ◽  
Molecular Structures ◽  
Iridium Complexes ◽  
X Ray Diffraction ◽  
Chelate Complexes ◽  
X Ray ◽  
Ring Nitrogen ◽  
Derivatives Of ◽  
Ring Nitrogen Atom ◽  
Palladium Platinum

2,5-Dihydroimidazoline-l-oxyl radicals I, II with imino substituents coordinate to Pd(II) and Pt(II) complexes with formation of the N,N chelate complexes 1-6. With oxygen containing substituents either monodentate N-coordination to give 8 or N ,O chelate formation to give 9 takes place, depending on the position of the oxygen atom relative to the ring nitrogen atom. With radicals III that also have the second ring nitrogen atom oxidized and the Rh(III) or Ir(III) complexes [Cp*MCl2]2 the O , O chelates 11 -13 could be obtained, while with Na2PdCl4 the heterocycle was destroyed with formation of a N,N chelate complex 10 of an α-nitrosooxime ligand. The orthopalladated 2,2,5,5 tetramethyl-4-phenyl-2,5-dihydroimidazoline-l-oxyl complex 7a reacts with several a-amino acidates under splitting of the dichloro bridge with formation of the C,N/N,O-bis-chelate complexes 7b-f. The molecular structures of 2 and 10 were determined by X-ray diffraction.

Part III: Surface-Enhanced Raman Scattering of Amino Acids and Their Homodipeptide Monolayers Deposited onto Colloidal Gold Surface

2005 ◽  
Vol 59 (12) ◽  
pp. 1516-1526 ◽  
Author(s):  
Edyta Podstawka ◽  
Yukihiro Ozaki ◽  
Leonard M. Proniewicz
Keyword(s):  
Amino Acids ◽  
Raman Scattering ◽  
Colloidal Gold ◽  
Gold Surface ◽  
Surface Enhanced Raman Scattering ◽  
Competitive Interactions ◽  
Surface Geometry ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Surface-enhanced Raman scattering (SERS) spectra were measured for monolayers of various amino acids: L-methionine (Met), L-cysteine (Cys), L-glycine (Gly), L-leucine (Leu), L-phenylalanine (Phe), and L-proline (Pro) and their homodipeptides (Met-Met, Cys-Cys, Gly-Gly, Leu-Leu, Phe-Phe, and Pro-Pro) deposited onto a colloidal gold surface. Orientation of amino acids and their homodipeptides, as well as specific-competitive interactions of their functional groups with the gold surface, were predicted by detailed spectral analysis of the obtained SERS spectra. The analysis performed allowed us to propose a particular surface geometry for each amino acid and homodipeptide on the gold surface. In addition, we compared the structures of these molecules adsorbed on colloidal gold and silver surfaces.

Surface-Enhanced Raman Scattering of Aromatic Sulfides in Aqueous Gold Sol

2000 ◽  
Vol 54 (3) ◽  
pp. 378-383 ◽  
Author(s):  
Sang Woo Joo ◽  
Sang Woo Han ◽  
Kwan Kim
Keyword(s):  
Raman Scattering ◽  
Gold Surface ◽  
Surface Enhanced Raman Scattering ◽  
Silver Surface ◽  
Visible Radiation ◽  
Absorption Bands ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Gold Sol

A surface-enhanced Raman scattering (SERS) study has been performed for benzyl phenyl sulfide (BPS) and dibenzyl sulfide (DBS) in aqueous gold sol to examine the feasibility of the occurrence of surface-induced photoreactions of aromatic sulfides. Although BPS and DBS were reported to be decomposed into mercaptides on the silver surface by the 514.5 nm radiation, the molecules were found not to undergo such reactions on the gold surface. Such a difference in behavior was speculated to be associated with the different adsorption strength of BPS and DBS on gold and silver. The absorption bands of BPS and DBS seemed to be substantially broadened on silver so that the low-energy tails of the broadened absorption bands were in resonance with the 514.5 nm radiation, while the electronic absorption bands were not broadened sufficiently on the gold surface to absorb visible radiation.

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