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Synthesis and structure of the complex NH 4[Yb(Cydta) (H 2O) 2]·5H 2O(Cydta=trans 1,2 cyclohexanediaminetetraacetic acid) were reported. The crystal and molecular structures of the title complex were determined by single crystal X ray structure analysis. The crystal of the complex NH 4[Yb Ⅲ(Cydta)(H 2O) 2]·5H 2O belongs to triclinic crystal system and P (1) space group. The crystal data are as follows: a =0.8584(4) nm, b =1.0040(4) nm, c =1.4418(6) nm, V =1.2025(9) nm 3, Z =2, M =659.49, D c=1.821 g·cm -3 , μ =3.963 mm -1 and F (000)=662. The final R and R w values for 4093 ( I >2 θ(I )) unique reflections are 0.0454 and 0.0927, and the R and R w values for 4877 (all data) are 0.0624 and 0.0985, respectively. The complex anion [Yb(Cydta)(H 2O) 2] - has a pseudo square antiprismatic eight coordinate structure in which the six coordinate atoms, two N and four O, are from a Cydta ligand and two water molecules coordinate to Yb(Ⅲ) ion directly as the another two ligands.
The crystal and molecular structures of the complex complex were determined by single crystal X. (Synthesis and structure of the complex NH 4 [Yb (Cydta) (H 2O) 2] · 5H 2O (Cydta = trans 1,2 cyclohexanediaminetetraacetic acid) were reported. The crystal of the complex NH 4 [Yb III (Cydta) (H 2 O) 2] 5H 2 O belongs to the triclinic crystal system and P (1) space group. The crystal data are as follows: a = 0.8584 , V = 1.2025 (9) nm 3, Z = 2, M = 659.49, D c = 1.821 g · cm -3, μ = 3.963 (4) nm, b = 1.0040 mm -1 and F (000) = 662. The final R and R w values for 4093 (I> 2 θ (I)) unique reflections are 0.0454 and 0.0927, and the R and R w values for 4877 (all data) are 0.0624 and 0.0985, respectively. The complex anion [Yb (Cydta) (H 2O) 2] - has a pseudo square antiprismatic eight coordinate structure in which the six coordinate atoms, two N and four O, are from a Cydta ligand and two water m olecules coordinate to Yb (Ⅲ) ion directly as the another two ligands.