Surface interactions of a homologous series of alpha,omega-amino acids on colloidal silver and gold.
Surface enhanced Raman spectroscopy (SERS) was used to characterize a homologous series of alpha,omega-amino acids on colloidal gold and silver. Raman and SER spectra of the alpha,omega-amino acids, NH2(CH2)nCOOH (n = 3-7), are presented and analyzed, revealing the probable conformations of the molecules on the metal surfaces. The alpha,omega-amino acids interact with silver and gold through both the amine and carboxylate end groups, and modify the conformation of the molecular backbone in order to maximize these interactions. An odd-even effect is observed for backbone conformations of molecules adsorbed to the silver substrate. The anomolous SER spectrum of 5-aminopentanoic acid on gold suggests the possibility of condensation polymerization at the gold surface.
Ooka
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AA
Department of Chemistry and Biochemistry, University of California at Los Angeles, 90095-1569, USA.
Kuhar
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KA
Cho
N
N
Garrell
R L
RL
D000473:Alkanes / Q000737:chemistry; D000596:Amino Acids / Q000737:chemistry*; D021542:Amino Acids, Neutral; D015119:Aminocaproic Acid / Q000737:chemistry; D002210:Caprylates / Q000737:chemistry; D003102:Colloids / Q000737:chemistry*; D017979:Gold Colloid / Q000737:chemistry*; D008968:Molecular Conformation; D012834:Silver / Q000737:chemistry*; D013059:Spectrum Analysis, Raman / Q000379:methods*; D013499:Surface Properties; D005680:gamma-Aminobutyric Acid / Q000737:chemistry
D000473:Alkanes; D000596:Amino Acids; D021542:Amino Acids, Neutral; D002210:Caprylates; D003102:Colloids; D017979:Gold Colloid; C046323:omega-aminocaprylic acid; D012834:Silver; D005680:gamma-Aminobutyric Acid; C013809:5-aminovaleric acid; C018819:omega-aminoenantic acid; D015119:Aminocaproic Acid