Three-dimensional copper(II) carboxylates based on 4,4′,4″-benzene-1,3,5-triyltris(benzoic acid)

Resumo

The homochiral coordination polymers [Cu₄(CH₃OH)(H₂O)₄(Hbtb)(S-mal)₂]•4H₂O and [Cu₄(CH₃OH)(H₂O)₄(Hbtb)(R-mal)₂]•4H₂O were synthesized by heating S- or R-malic acid (H₃mal), 4,4′,4″-benzene-1,3,5-triyltris(benzoic acid) (H₃btb), and copper(II) acetate in an aqueous methanolic solution. The reaction with copper(II) nitrate in aqueous dioxane afforded the coordination framework [Cu₆(C₄H₈O₂)₃(H₂O)₃(btb)₄]•4C₄H₈O₂•10H₂O, which does not contain chiral ligands. The compositions and crystal structures of the new compounds were determined by single-crystal X-ray diffraction and confirmed by X-ray powder diffraction, IR spectroscopy, thermogravimetric and elemental analysis.