In this paper, the molecular and crystal structures of the NH4[Y(trans CYDTA)(H2O)2]· 4.5 H2O(trans CYDTA=trans 1,2 cyclohexanediaminetetraacetic acid) are reported. The crystal data are as follows: Triclinic system, space group,a=0.8599(6)nm,b=1.0021(7)nm,c=1.4370(9)nm,α =88.095(13)° ,β =75.559(1)° ,γ =88.344(12)° ,V=1.1981(14)nm3,Z=2, M=708.68,Dc=1.570g· cm- 3, μ =2.506mm- 1 and F(000)=590. The final R1 and wR2 are 0.0571 and 0.1350 for 4205 [I >2.0σ (I)] unique reflections and 0.1007 and 0.1615 for all 4981 reflections, respectively. In the title complex, the anion [Y(trans CYDTA)(H2O)2]- has an eight coordination structure with distorted square antiprism. The trans CYDTA which acts as a hexadentate ligand with four O atoms and two N atoms and two H2O molecules directly coordinate to central metal Y? ion. It can be known that the Y? ion can form an eight coordinate compound with aminopolycarboxylic acid ligands in addition nine coordination structure.
In this paper, the molecular and crystal structures of the K3·5H2O(TTHA=triethylenetetraminehexaacetic acid)are given. The crystal data are as follows: monoclinic system, P21/c space group, a=1.0290(9)nm, b=1.2466(11)nm, c=2.279(2)nm, β=91.322(16)°, V=2.923(5)nm3, Z=4, M=860.67, Dc=1.956gcm-3, μ=3.217mm-1, F(000)=1720. The final R1 and wR2 are 0.0395 and 0.0796 for 5145 [I >2.0σ(I)] unique reflections and 0.0546 and 0.0833 for all 11567 reflections, respectively. In the title complex, the anion 3- has a nine coordination structure with distorted tricapped trigonal prism. A TTHA having four N atoms of amido groups and six O atoms of carboxylic groups acts as a enneadentate ligand with four N atoms and five O atoms. In addition, there is a free non coordinated carboxyl group ( CH2COO-) in the complex anion 3-. The free carboxyl group could be embellished by some biological molecules which have selectivity and affinity to tumor cell. Then the 166HoⅢ TTHA complex may become radioactive anti tumor drug having targeting function.
