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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, (NH_ 4 )[Y Ⅲ (edta)(H_ 2 O)_ 3 ]55H_ 2 O and (NH_ 4 )[Y Ⅲ (cydta)(H_ 2 O)_ 2 ]55H_ 2 O as well as (NH_ 4 )[Gd Ⅲ (edta)(H_ 2 O)_ 3 ]55H_ 2 O and (NH_ 4 )[Gd Ⅲ (cydta) (H_ 2 O) _ 2 ]55H_ 2 O complexes.
The crystal and molecular structures of cydta (trans-1, 2-cyclohexanediaminetetraacetic acid) have been determined by single crystal X-ray structure analyzes. 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, (NH 4) [Y III (edta) (H 2 O) 3 ] 55H 2 O and (NH 4) [YIII (cydta) (H20) _2 ] 55H_2O as well as (NH_4) [GdIII (edta) (H20) _3 ] 2 O and (NH 4) [Gd III (cydta) (H 2 O) 2 ] 55H 2 O complexes.