Nickel(II)dicyanamide complexes containing a diamine as end-capping ligand: Composition tailored architectures and magnetic properties

One 0D monomer trans-[Ni(pn)2(dca)2] (1), one neutral 2D polymer [Ni(pn)(dca)2]n (2) and one polycationic 1D polymer [Ni(pn)2(dca)]n(PF6)n (3) (pn = 1,3-propanediamine; dca = dicyanamide) have been synthesized and X-ray crystallographically characterized. 1 has terminal trans-Ni(dca)2 unit, 2 contains both double bridged Ni–(NCNCN)2–Ni and single bridged Ni–(NCNCN)–Ni units in alternate fashion and 3 consists of single Ni–(NCNCN)–Ni bridge by covalent bonds. The nickel(II) centers are six-coordinated with distorted octahedral geometry. Multiple lateral N–H···N, C–H···N, N–H···F and C–H···F hydrogen bondings promote dimensionality. Variable-temperature magnetic measurements indicate weak antiferromagnetic interactions through μ1,5 bridge(s).