A novel 1-D mixed-valence cobalt coordination polymer bridged with (μ-Oalkoxo) and (μ-carboxylate) units: Synthesis, structure and properties

A novel one-dimensional helical mixed-valence cobalt coordination polymer (1) {[CoIICoIII(HL)2(OAc)]·CH3OH·H2O}n, (H3L = 2-ethyl-2-((2-hydroxynaphthalen-1-yl)methyleneamino)propane-1,3-diol) has been synthesized and characterized. Single-crystal X-ray diffraction analyses reveal that complex 1 crystallizes in the tetragonal I4(1)/a space group. It consists of a bimetallic CoIICoIII(μ2-O)2 core, and the adjacent CoII(2) centers are sequentially bridged by carboxylate groups in the syn–anti fashion, affording to a one-dimensional infinite helical chain along the c-axis. Adjacent chains are stacked via CH···π interactions to form the overall three-dimensional supramolecular networks. Magnetic and in vitro anticancer activities of the complex have been investigated in detail.

Susceptibility data for {[CoIICoIII(HL)2(OAc)]·CH3OH·H2O}n in χMT (○) vs. T(Δ).Figure optionsDownload as PowerPoint slideHighlights
► 1D mixed-valented cobalt coordination polymer are synthesized and characterized.
► Carboxylate groups bridge in the syn–anti fashion, leading to right-helice.
► Weak FM exchange interaction may occur in complex.
► In vitro anticancer activity of the complex are determined against A-549 cells.