Network Coordination Polymers Based on Thieno[3,2-b]Thiophene-2,5-Dicarboxylic Acid

Abstract

Heating the solutions of Mn(II), Cd(II) salts and thieno[3,2-b]thiophene-2,5-dicarboxylic acid (H₂[3,2-b]ttdc) in N,N-dimethylformamide (DMF) or N,N-dimethylacetamide (DMA) results in the formation of crystalline complex compounds [Mn₂([3,2-b]ttdc)₂(dmf)₂]·4DMF (1), [Cd₂([3,2-b]ttdc)₂(dmf)₂]·2DMF (2), and [Mn₂([3,2-b]ttdc)₂(dma)₂]·2[Mn(dma)₆](ClO₄)₂ (3). According to the X-ray diffraction data, the compounds are two-dimensional layered coordination polymers with square network topologies. In compounds 1 and 2 the layers are shifted relative to each other, while in 3 the layers are located exactly one above another to form extended 9.5×13.0 Å channels occupied by solvated [Mn(dma)₆]²⁺ complex cations and perchlorate ClO₄⁻ anions located mainly near thienothiophene groups.