An unexpected coordination polymer containing one-dimensional chlorine-bridged copper(II) magnetic chain induced by organic cation: Synthesis, crystal structure and magnetic properties

Reaction of 1-(4′-nitrobenzyl)-4-methylpyridinium chloride ([NO2BzMePy]Cl and CuCl2 with concentrated hydrochloric acid results in the forming of an unexpected coordination polymer {[NO2BzMePy][CuCl3]}∞(1), in which the [CuCl3]− anions form a one-dimensional chlorine-bridged Cu(II) chain with the Cu···Cu distance of 3.236 Å, while the [NO2BzMePy]+ cations stack into a column through CH···π and π···π interactions. The crystal structure is stabilized by an extensive network of CH···Cl hydrogen bonds between the columns and the chains, and 1 exhibits ferromagnetic coupling behavior with J = 22.11 cm− 1.

Graphical abstractIn {[NO2BzMePy][CuCl3]}∞(1) ([NO2BzMePy]+ = 1-(4′-nitrobenzyl)-4-methylpyridinium), the [CuCl3]− anions form a one-dimensional chlorine-bridged Cu(II) chain, while the [NO2BzMePy]+ cations stack into a column, and 1 exhibits ferromagnetic coupling behavior with J = 22.11 cm− 1.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► A new coordination polymer containing [CuCl3]− anion was unexpectedly obtained. ► The [CuCl3]− anions form a one-dimensional chlorine-bridged Cu(II) chain. ► The [NO2BzMePy]+ cations stack into a column through CH···π and π···π interactions. ► The plane square and octahedron geometry configuration were arranged alternately in the chain. ► Compound 1 exhibits ferromagnetic coupling behavior with J = 22.11 cm− 1.