Stabilization of Nickel(II) Chlorocomplexes with α,ω-Alkanediammonium Cations

Abstract The following nickel(II) chlorocomplexes stabilized with α,ω alkanediammonium cations were prepared: NiCl2·2bnH2Cl2·5H2O (1), 2NiCl2·2pnH2Cl2·4H2O (2), 2NiCl2·hnH2Cl2·4H2O (3), 2NiCl2·2hpH2Cl2·4H2O (4), where bn = 1,4-butanediamine, pn = 1,5-pentanediamine, hn = 1,6-xanediamine and hp = 1,7-heptanediamine. The solid state electronic spectra and magnetic moments show that nickel (II) is octahedral in all the compounds. The complex anion can be formulated as [Ni2Cl6(H2O)4]2− for compound (3), [Ni2Cl8(H2O)2]4- for compounds (2) and (4) and [NiCl4(H2O)2]2- for compound (1). By loss of water molecules the corresponding anhydrous compounds are produced; these apparently contain the dimer species with pentacoordinated nickel [Ni2Cl8]4-. The anhydrous compound obtained from (3) contains the polymeric species with hexacoordinated nickel [NiCl3]n- n.