Hydrothermal Synthesis, Crystal Structure and Magnetic Property of a Novel 3D Coordinated Polymer [Mn(tzda)(4,4′‐bipy)(H₂O)]_n

A novel 3D coordination polymer [Mn(tzda)(4,4′‐bipy)(H₂O)] _n (1) of mixed ligands, (1,3,4‐thiadiazole‐2,5‐diyldithio)diacetic acid (H₂tzda) and 4,4′‐bipyridine, has been hydrothermally synthesized and characterized by single‐crystal X‐ray diffraction and IR spectra. Complex 1 crystallizes in the orthorhombic space group Pbca with a=18.1657(9)Å, b=9.0882(5)Å, c=22.9333(12)Å. In the structure, each Mn(II) ion is in a distorted octahedral coordination geometry, three among four coordination sites of the equatorial plane are occupied by the carboxylate oxygen atoms and the remaining site is occupied by the water molecule while the apical positions are occupied by two nitrogen atoms from two bipy molecules. The six‐coordinated Mn ions are interlinked by flexible tzda ligands to form layers, which are sustained by rigid 4,4′‐bipy ligands into a 3D open framework. The magnetic property of 1 was also investigated and the magnetic susceptibility data were rationally fitted with J=−0.103 cm⁻¹, g=2.09, zJ′=−0.02 cm⁻¹, showing weakly antiferromagnetic interactions among Mn(II) ions in 1.

Keywords:

• coordination polymer
• flexible carboxylate ligand
• 4,4′‐bipyridine
• crystal structure
• magnetic property

This work was sponsored by the National Natural Science Foundation of China (No. 20471053), the China National Key Basic Research Special Funds (No. 2003CB214500) and the Energy and Technology Program from Zhengzhou University.