Abstract
Six new aminocarboxylic ligands were synthesized by reactions of EDTA (ethylenediaminetetraacetic acid) dianhydride or DTPA (diethylenetriaminepenta—acetic acid) dianhydride and ethyl ester of serine, threonine and tyrosine. Their paramagnetic metal complexes were also synthesized. All ligands and paramagnetic metal complexes were characterized by IR spectra,1H NMR and elemental analyses. Relaxivity study showed that the metal complexes had higher relaxation effectiveness as compared to corresponding unmodified metal complexes. Imaging study of gadolinium complex of tyrosine ethyl ester modified DTPA in mice demonstrated that this metal complex could apparently increase the signal intensity of MR images.
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