2D s-d Mixed-Metal Coordination Polymer Containing Potassium, Chromium(III) and Dipicolinate Ions: Preparation and Crystal Structure

作者：Hakimi Mohammad^*; Kukovec Boris Marko; Minoura Mao

来源：Journal of Chemical Crystallography, 2012, 42(3): 290-294.

DOI：10.1007/s10870-011-0242-0

• Potassium(I)
• Chromium(III)
• 2D coordination polymer
• X-ray crystal structure
• Dipicolinic acid

The reaction of pyridine-2,6-dicarboxylic acid (dipicolinic acid, dipicH(2)) with potassium tetraperoxochromate(V) in the mixture of water and ethanol led to the formation of a 2D s-d mixed-metal coordination polymer of {K[Cr(dipic)(2)]}(n) (1). The compound was characterized by spectroscopic methods (IR, Raman, UV/Vis). Single crystal X-ray diffraction analysis revealed that dipicolinate ligand is coordinated to the chromium(III) ion in an O,N,O%26apos;-tridentate fashion, while its uncoordinated and coordinated carboxylate O atoms (with respect to Cr(III) ion) are in turn bound to potassium ions. Therefore, each dipicolinate ligand bridges two potassium ions and a chromium(III) ion between them, giving rise to a 2D coordination network. The coordination of chromium(III) ions is octahedral, while the coordination number of potassium ions is 8. The coordination networks are in turn assembled only by pi-pi stacking interactions into a 3D structure.

• 出版日期2012-3