Temperature-induced structural diversity of two coordination polymers: magnetic properties and treatment activity on depression via activating the nigrostriatal dopamine D2 receptor

Abstract

By applying the mixed-ligand approach, two new Co(II)-including coordination polymers (CPs) {[Co2(Glu)2(1,4-mbix)2(H2O)2]·H2O}n, (1) and {[Co(Glu)(1,4-mbix)]·4H2O}n (2), were formed by taking glutarate (Glu2−) blended with 1,4-bis [(2-methyl-1H-imidazol-1-yl)methyl]benzene (1,4-mbix) by using different reaction temperatures. The as-prepared complexes were evaluated through IR spectroscopy, elemental analysis, powder X-ray diffraction analysis (PXRD), TG analysis and single-crystal X-ray diffraction. The structural characterization results show that complex 1 features a 3D framework structure with a four-connected neb-type topology, while complex 2 demonstrates a 2D layered structure with a four-connected sql-type topology. The magnetic studies show that compounds 1 and 2 have antiferromagnetic coupling between the adjacent metallic ions. Their biological activity on depression animal model was determined and the mechanism was detected. Firstly, the depression animal model was built and the compounds were given for indicated treatment. The nigrostriatal dopamine D2 receptor content was measured by real time reverse transcription-polymerase chain reaction (RT-PCR). The content of the 5-hydroxy trptamine (5-HT) and Norepinephrine (NE) was measured by enzyme linked immunosorbent assay (ELISA) detection kit after compounds treatment.