A zipper-like double chain coordination polymer constructed from a novel pseudo-macrocyclic binuclear Cu(II) complex

A novel coordination polymer [Cu2(HL)(CH3OH)(ClO4)]n(ClO4)n (1) has been synthesized from a multihydoxy Schiff base ligand, 1,3-bis(salicylidene iminoethylamino)-2-propanol (H3L). Single crystal X-ray diffraction analyses reveal that the coordination polymer is comprised of binuclear units, wherein the copper centers are bridged by a single alkoxo group, with a large bridging angle of 135.06°. By the linkage of an intramolecular hydrogen bond, an interesting pseudo-macrocyclic structure is formed. The binuclear moieties are assembled into a 1-D chain by the linkage of axially coordinated ClO4− anions, and the 1-D chains are further connected via intermolecular C-H⋅⋅⋅π stacking interactions, affording a zipper-like double chain supramolecular structure. Variable-temperature magnetic data measurements and analyses show the existence of strong antiferromagnetic interaction between the copper centers within the binuclear unit, mediated by the single alkoxo bridge with a − 2J value of 545 cm− 1.