Syntheses, characterization of three new cobalt(II) complexes with 2-phenylsuccinic acid and flexible bis(imidazole) linkers

Bis(imidazole) derivatives (obix, mbix, pbix = 1,2-/1,3-/1,4-bis((imidazol-1-yl)methyl)benzene) with Co(II) and flexible 2-phenyl succinic acid (phsucH2) afforded three coordination polymers namely, [Co(mu-phsuc)(mu-obix)]n ( 1 ), {[Co(mu-phsuc)(mu-mbix)] center dot H2O}n ( 2 ), {[Co(mu 4-phsuc)(mu-pbix)0.5] center dot H2O}n ( 3 ) and they were characterized by elemental analysis, magnetic susceptibility, solid-state UV-Vis. and IR spectro-scopies and single crystal X-ray diffraction techniques. The phase purities of the complexes were con-firmed by powder X-ray diffraction analysis. X-ray diffraction studies have shown that compounds 1 and 2 crystallize in the monoclinic system, in the P21/c space group, while compound 3 crystallizes in the P-1 space group in the triclinic system. In all compounds, bis(imidazole) ligands act as bis(monodentate), whereas 2-phenylsuccinate ligands act as both monodentate and bidentate bridges in 1 , bis(monodentate) bridges in 2 , tetrakis(monodentate) bridges in 3 . The complexes displayed 2D layer structures and adja-cent 2D layers are joined by C-H center dot center dot center dot 7r interactions in 1 , weak C-H center dot center dot center dot O interactions in 2 , 7r center dot center dot center dot 7r stacking and weak C-H center dot center dot center dot 7r interactions in 3 to form a 3D supramolecular network. The contribution of the binding positions of the imidazole groups to the phenyl ring in bis(imidazole) ligands to the structure and struc-tural diversity are also discussed. In addition, the thermal properties of the compounds were investigated in the study.(c) 2023 Elsevier B.V. All rights reserved.