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 Csingle bondH···π and π···π interactions. The crystal structure is stabilized by an extensive network of Csingle bondH···Cl hydrogen bonds between the columns and the chains, and 1 exhibits ferromagnetic coupling behavior with J = 22.11 cm− 1.