Vibrational and Electronic Spectroscopic Characterizations of Amino Acid-Metal Complexes
2010
Han, J.H., Chung-Ang University, Ansung, Republic of Korea | Chi, Y.S., Chung-Ang University, Ansung, Republic of Korea
For vibrational and electronic spectroscopic characterizations of α-amino acid mineral chelates, nine water-soluble α-amino acids of Ala, Asn, Gin, His, Ile, Lys, Pro, Thr, and Val were used to prepare metal complexes with Fe(Ⅱ), Fe(Ⅲ), Cu(Ⅱ), and Zn(Ⅱ) ions. The α-amino acid-metal complexes were characterized by FT-IR and UV-Vis spectrometers to determine the complex formation. The vibrational energy changes of the ammonium and carboxylate groups by FT-IR spectroscopy were characteristic features in the amino acid-metal complex formation. The electronic transition energy changes determined by UV-Vis spectrometer were also characteristic to the Fe(Ⅱ), Fe(Ⅲ), and Cu(Ⅱ) complexes. The amino acid-Zn(Ⅱ) complexes did not show these changes, because there was no absorption band due to d-d transitions.
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