Synthesis, crystal structures and magnetic properties of three Ni(II) complexes having NiN4 core with argentocyanide, terephthalate and dicyanamide ions: From discrete molecule to a helical network
摘要:
This work describes the synthesis and X-ray crystallographic characterization of three nickel(II) complexes [Ni(3,2,3-tet){Ag(CN)(2)}(2)] (1), [Ni(3,2,3-tet)(mu-tp)](n)center dot 1.5nH(2)O (2) and {[Ni(3,2,3-tet)(mu(1.5)-dca)](ClO4)}(n)(3) where 3,2,3-tet = N,N'-bis(3-aminopropyl)-1,2-ethylene-diamine, tp = terephthalate and dca = dicyanamide. Compound I is a heterotrinuclear discrete distorted octahedral molecule whereas compound 2 forms a ID polymeric network and an extended 21) network is formed by intermolecular hydrogen bonding. Interestingly, two adjacent ID chains execute a novel double-helical network constructed by Ni(II) and the bridging dca ligand in compound 3. The variable temperature magnetic susceptibility measurements for compounds 2 and 3 were also carried out. (c) 2007 Elsevier Ltd. All rights reserved.