Synthesis, crystal structure and magnetic properties of a one-dimensional Mn2+ complex constructed from (+)-dibenzoyltartaric acid and 2,2 ′ -bipyridine

The self-assembly reaction of (+)-dibenzoyltartaric acid (d-H2DBTA) with 2,2 ′ -bipyridine (bpy) and Mn(CH3CO2)2 · 4H2O yielded a new coordination polymer, namely, catena-poly[[[diaqua(2,2 ′ -bipyridine- κ 2N,N ′ )manganese(II)]- μ -2,3-bis(benzoyloxy)butanedioato- κ 2O2:O3] dihydrate], {[Mn(C18H12O8)(C10H8N2)(H2O)2] · 2H2O}n or {[Mn(DBTA)(bpy)(H2O)2] · 2H2O}n, (I). Complex (I) has been characterized by elemental analysis, IR spectroscopy, thermogravimetric analysis (TGA) and single-crystal and powder X-ray diffraction. It crystallizes in the orthorhombic space group P212121. In the complex, the Mn2+ cation displays a distorted octahedral {MnO4N2} geometry, formed from two carboxylate O atoms of two DBTA2 − ligands, two cis-oriented N atoms from one chelating 2,2 ′ -bipyridine ligand and two trans-oriented O atoms from coordinated water molecules. The polymer displays a 1D chain with an Mn...Mn distance of 9.428   (1)   Å . Due to the presence of flexible polycarboxylate and rigid bipyridyl ligands in the molecular structure, a high thermal stability of the complex is attained. The magnetic properties of (I) were analyzed based on the mononuclear Mn2+ model due to the long intramolecular Mn...Mn distance. The zero field splitting (ZFS) contribution in the high-spin Mn2+ cation is almost negligible and there are weak antiferromagnetic couplings between 1D chains [zJ ′ = − 0.062   (5)   cm − 1], corresponding to an intermolecular Mn...Mn distance ...

Source: Acta Crystallographica Section C - October 19, 2021 Category: Chemistry Authors: Jiao, Y. Jin, F.-N. Feng, S.-S. Wang, A. Englert, U. Tags: ( )-dibenzoyltartaric acid d-H2DBTA manganese coordination polymer crystal structure 1D chain thermostability magnetism research papers Source Type: research