Crystal structure and magnetic behaviour of a new kind of one-dimensional nickel(II) thiocyanate compound [{NiL(SCN)(µ-SCN)}n][L = bis(3-aminopropyl)methylamine]

Abstract

The µ-thiocyanato nickel(II) one-dimensional compound, [{NiL(SCN)(µ-SCN)}_n][L = bis(3-aminopropyl)methylamine] has been prepared. The crystal structure of this compound has been solved by Patterson synthesis and refined by least-squares analysis to a discrepancy factor of 0.068. The crystals are monoclinic, space group P2₁/n, with lattice constants a= 11.113(3), b= 16.706(4), c= 7.802(2)Å; β= 106.94(3)°. This compound represents the first structurally described nickel(II) chain in which two neighbouring nickel(II) ions are linked by only one SCN^– bridging ligand. Magnetic susceptibility data, measured from 290 to 4 K, show weak ferromagnetic behaviour. These data were fitted to the de Neef equation giving the parameters J= 1.12 cm^–1, g= 2.16 and D= 1.72 cm^–1.