Investigation on the coordinate structures of the rare earth metal complexes with edta and cydta ligands

The crystal and molecular structures of cydta (trans-1, 2-cyclohexanediaminetetraacetic acid) have been determined by single-crystal X-ray structure analyses. The reasons that RE^III-edta and RE^III-cydta complexes select different coordinate structures were discussed and illustrated through the comparison of the molecular and crystal structures between edta and cydta, (NH₄) Y^III (edta) (H₂O)₃]·5H₂O and (NH₄)Y^III (cydta) (H₂O)₂]·5H₂O as well as (NH₄) Gd^III (edta) (H₂O)₃)]·5H₂O and (NH₄) Gd^III (cydta) (H₂O)₂]·5H₂O complexes. Foundation item: Supported by Scientific and Technologie Committee of Liaoning Province in China (9810300901) Biography: Wang Jun (1960-), male, Professor, Ph. D, research direction: structures and properties of rare earth complexes.