Syntheses and characterization of Co(II) and Cu(II) coordination polymers (CPs) based on mixed flexible and rigid ligands

• Two complexes have been synthesized.
• Complex 1 displays a 3D 8-fold interpenetration network while complex 2 shows a 2D layer.
• Variable-temperature magnetic investigations for 1 have been discussed.

Two new Co(II) and Cu(II) complexes, {[Co(bib)(4,4 ′-sdc)]}n (1), and {[Cu(bib)(4,4′-sdc)·4H2O]}n (2) (bib = 1,4-bis(2-methyl-imidazol-1-yl)butane, 4,4′-sdc = 4,4′-stilbenedicarboxylic acid), have been synthesized under similar reaction conditions. These newly synthesized complexes were characterized by single-crystal X-ray diffraction, elemental analysis, and thermogravimetry. The magnetic susceptibility of complex 1 was also investigated. Complex 1 displays a 3D 8-fold interpenetration network in the [4 + 4] manner. However, complex 2 reveals a 2D layered architecture constructed by linking the meso-helical chains to the 4,4′-sdc ligands.

Two new Co(II) and Cu(II) complexes constructed by mixed ligands bib and H2sdc have been synthesized under the same synthetic conditions. The structures of the two are definitely different. Complex 1 features a 3D 8-fold interpenetration network in the [4 + 4] manner. However, complex 2 shows a two-dimensional (2D) sheet architecture constructed by linking the meso-helical chains to the 4, 4′-sdc ligands.Figure optionsDownload as PowerPoint slide