Synthesis, crystal structures and magnetic properties of a series of new cyano-bridged complexes derived from templates [Ni(CN)4]2− and [Co(III)(CN)6]3−

Abstract

Three new cyano-bridged complexes 1 [Ni(tn)2Ni(CN)4] (tn = 1,3-diaminopropane), 2 [CuII(dipn)NiII(CN)4], and 3 [Cu(dipn)]6[Co(CN)6]4 · 4H2O (dipn = dipropylenetriamine) have been assembled by the templates [Ni(CN)4]2− and [Co(CN)6]3−. 1 consists of a one-dimensional linear chain–Ni(tn)2–NC–Ni(CN)2–CN–Ni(tn)2− in which the Ni(II) centers are linked by two CN groups. One 1-D zigzag chain of 2 is formed with–Ni(2)–C–N–Cu(1)–N–C–linkages. A 2D structure of 3 is formed by an alternate array of [Co(CN)6]3− and [Co][Cu6] units. For 1, there is an overall weak antiferromagnetic interaction between Ni(II) ions through the–NC–Ni–CN–bridges of the diamagnetic [Ni(CN)4]2− anions. 2 exhibits a weak antiferromagnetic exchange interaction between copper(II) ions mediated by [Ni(CN)4]2− diamagnetic bridges. Complex 3 exhibits a weak ferromagnetic interaction between nearest CuII and CuII atoms through–NC–Co–CN–bridges.