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) {[(CoCoIII)-Co-II(HL)(2)(OAc)]center dot CH3OH center dot 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 14( 1)/a space group. It consists of a bimetallic (CoCoIII)-Co-II(mu(2)-O)(2) core, and the adjacent Co-II(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 C-H center dot center dot center dot pi interactions to form the overall three-dimensional supramolecular networks. Magnetic and in vitro anticancer activities of the complex have been investigated in detail. (C) 2012 Elsevier B.V. All rights reserved.