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Vibrational spectra investigations of ytterbium chelate with isoleucine as ligand

The chelate of Ytterbium with L-isoleucine (essential amino acid) as ligand, were synthesized in ethanol-water solution and analyzed by spectroscopic means (Raman, FTIR). The comparative analysis of the IR and Raman spectra for the ligand and the complexes indicate the coordination of Ytterbium ion with the carboxylic oxygen atom and the nitrogen atom of the amino group to form chelate. | Journal of Chemistry, Vol. 47 (5), P. 652 - 657, 2009 VIBRATIONAL SPECTRA INVESTIGATIONS OF YTTERBIUM CHELATE WITH ISOLEUCINE AS LIGAND Received 5 August 2009 Le Minh Tuan1, nguyen trong uyen2, nguyen Dinh bang2 1 Institute for Technology of Radioactive and Rare Elements. VAEC 2 Chemistry faculty, Hanoi University of Science, Hanoi National University Abstract Lanthanide amino acid chelates are known to play an important role in many biological processes and prove the higher bioactivity compared to their inorganic compounds or complexes, so that there is a growing need for methods of characterizing these chelates. Raman as well as infrared (IR) spectroscopy can be used to identify as well as characterize the coordination of metal with ligand. However, the combination of both spectroscopic techniques can give a better evaluation of their molecule structures. The chelate of Ytterbium with L-isoleucine (essential amino acid) as ligand, were synthesized in ethanol-water solution and analyzed by spectroscopic means (Raman, FTIR). The comparative analysis of the IR and Raman spectra for the ligand and the complexes indicate the coordination of Ytterbium ion with the carboxylic oxygen atom and the nitrogen atom of the amino group to form chelate. Key words: Ytterbium, L-isoleucine, chelate, coordination, vibrational spectra, FT Raman, FTIR. I - INTRODUCTION In recent years the amino acids as ligands have received much attention because they proved to be chelators when they react with positively charged metal atoms, forming a strong chemical bond. The metallic atoms of interest here are those that serve as dietary minerals [1, 2]. Twenty natural amino acids comprise the building blocks of proteins, which are chemical species indispensable to perform a large number of biological functions [3]. Many studies have shown that organically bound minerals generally have a higher bioavailability than inorganic minerals such as sulfates or oxides. This means that .