dorsal/arxiv
View SchemaComparison of metal-amino acid interaction in Phe-Ag and Tyr-Ag complexes by spectroscopic measurements
| Authors | Achintya Singha, Swagata Dasgupta, Anushree Roy |
|---|---|
| Categories | |
| ArXiv ID | physics/0509044 |
| URL | https://arxiv.org/abs/physics/0509044 |
Abstract
In this article, we have compared the metal-amino acid interactions in Tyr-Ag and Phe-Ag complexes through pH dependent SERS measurements. By analyzing the variation in relative intensities of SERS bands with the pH of the amino acid solution, we have obtained the orientation and conformation of the amino acid molecules on the Ag surface. The results obtained from our experimental studies are supported by the the energy minimized strucutres and the observed charge distributions in different terminals of the molecules. This, in a way, shows that SERS measurements not only exhibit the interaction of the amino acid molecules with Ag clusters but also demonstrate their orientation around it. We have addressed a long standing query on whether the amine group is directly attached with Ag surface along with the carboxylate group and $\pi$-electrons in these systems. In addition, pH dependent optical absorption and transmission electron microscopy measurements have been performed to understand the required conditions for the appearance of the SERS spectra in the light of the aggregation of metal particles and the number of hot sites in the sol. Our results confirm that the formation of hot sites in the sol plays a direct role to form a stable Ag-ligand complex. Furthermore, the interaction kinetics of metal-amino acid complexes have been analyzed via both Raman and absorption measurements.
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"abstract": "In this article, we have compared the metal-amino acid interactions in Tyr-Ag\nand Phe-Ag complexes through pH dependent SERS measurements. By analyzing the\nvariation in relative intensities of SERS bands with the pH of the amino acid\nsolution, we have obtained the orientation and conformation of the amino acid\nmolecules on the Ag surface. The results obtained from our experimental studies\nare supported by the the energy minimized strucutres and the observed charge\ndistributions in different terminals of the molecules. This, in a way, shows\nthat SERS measurements not only exhibit the interaction of the amino acid\nmolecules with Ag clusters but also demonstrate their orientation around it. We\nhave addressed a long standing query on whether the amine group is directly\nattached with Ag surface along with the carboxylate group and $\\pi$-electrons\nin these systems. In addition, pH dependent optical absorption and transmission\nelectron microscopy measurements have been performed to understand the required\nconditions for the appearance of the SERS spectra in the light of the\naggregation of metal particles and the number of hot sites in the sol. Our\nresults confirm that the formation of hot sites in the sol plays a direct role\nto form a stable Ag-ligand complex. Furthermore, the interaction kinetics of\nmetal-amino acid complexes have been analyzed via both Raman and absorption\nmeasurements.",
"arxiv_id": "physics/0509044",
"authors": [
"Achintya Singha",
"Swagata Dasgupta",
"Anushree Roy"
],
"categories": [
"physics.bio-ph"
],
"title": "Comparison of metal-amino acid interaction in Phe-Ag and Tyr-Ag complexes by spectroscopic measurements",
"url": "https://arxiv.org/abs/physics/0509044"
},
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