稀土元素与L-酪氨酸和甘氨酸三元固态配合物的合成及表征

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

目前稀土与氨基酸三元固态配合物的研究着重于少数稀土-氨基酸-非氨基酸类型.本文报道了10种稀土与L-酪氨酸(Tyr,HO——CH_2(NH_2)CHCOOH)和甘氨酸(Gly,NH_2CH_2COOH)三元固态配合物的合成及FTIR光谱、质谱表征.

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 [Gd165(Tyr) (NH2CH2COO)3.3H2O]+, further support the formation of the ternary complexes. In FTIR spectra, va2,cCOO- 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.