Synthesis and Characterization of the Solid Ternary Complexes of Rare Earths with L-Tyrosine and Glycine

Abstract

Abstract: The title complexes Ln(Tyr)(Gly)₃Cl₃·3H₂O(Ln = La-Ho, except Pm) were synthesized.The mass spectra of gadolinium complex, in which the strongest peak (m/e=612) was assigned to [Gd¹⁵⁵(Tyr)(NH₂CH₂COO)₃·3H₂O]⁺, further support the formation of the ternary complexes.In FTIRspectra, v_as,COO^- shifts to higher frequencies after the coordination (the heavy rare earth complexes shifted by 17～19 cm^-1), but the shifting of vs,COO- is smaller.Two new absorption bands at 390 cm^-1 (strong) and 443 cm^-1(weak) are attributed to Ln-O and Ln-OH₂ stretching vibration, respectively.These results indicate that the carboxylate ions coordinate to the rare earths as an unsymmetrical bridging bidentate ligand.

Key words: Rare earth complex, L-Tyrosine, Glycine

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LIU Jing-xin, DUAN Li-mei, SUN Yuan-hong . Synthesis and Characterization of the Solid Ternary Complexes of Rare Earths with L-Tyrosine and Glycine[J]. Chem. J. Chinese Universities, 1992, 13(3): 300.

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Synthesis and Characterization of the Solid Ternary Complexes of Rare Earths with L-Tyrosine and Glycine

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