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 [Cu^II(dipn)Ni^II(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 Cu^II and Cu^II atoms through–NC–Co–CN–bridges.

Keywords:

• Cyano-bridged complexes
• Crystal structures
• Magnetic properties

Acknowledgements

This work was supported by the fund of the Ministry of Education of China (No. B7050170). We also thank the South China University of Technology for financial support (grant No. B15-Y1060240, B15-Y1060230 and B15-Y1060340).