Synthesis, Crystal Structure and Characterizations of a Novel 3D Coordinated Polymer [Gd2(tzda)3(H2O)5] n [H2tzda=(1,3,4‐Thiadiazole‐2,5‐diyldithio)diacetic Acid]

A novel 3D coordination polymer [Gd2(tzda)3(H2O)5] n (1) has been synthesized by hydrothermal reaction of Gd(NO3)3 with a flexible building unit—(1,3,4‐thiadiazole‐2,5‐diyldithio)diacetic acid (H2tzda). X‐ray single crystal diffraction analysis reveals that 1 belongs to triclinic system, P1¯ space group. The crystallographic data are: a=9.6769(7)A, b=13.4539(9) A, c=14.9369 (10)A, α=65.9050(10)°, β=82.1290(10)°, γ=80.1210(10)°. In the structure, two Gd(III) ions are both nine‐coordinated and in different coordination environments while the tzda2‐ anions display three different coordination modes to link Gd(III) ions and then form a complicate three‐dimensional network structure.