Synthesis, Structure, and Magnetic Properties of a New Bis(maleonitriledithiolate)nickelate(III) Anion Salt Containing 1-(2′-Chlorobenzyl)-2-aminopyridinium

Abstract

A new salt, [2ClBz2NH2Py][Ni(mnt)2](1), ([2ClBz2NH2Py]+ = 1-(2´-chlorobenzyl)-2-aminopyridinium, mnt2− = maleonitril-edithiolate), was prepared and characterized structurally by means of CHN elemental analyses, IR, MS spectra and single crystal X-ray diffraction. Compound 1 crystallizes in the monoclinic space group C2/c with lattice contents a = 24.947(2) Å, b = 12.658(1) Å, c = 15.045(2) Å, β = 97.41(1)°, V = 4711.0(8) Å3, and Z = 8. The Ni(III) ions of 1 form a 1D spiral zigzag non-uniform magnetic chain within a [Ni(mnt)2]− column with the Ni···Ni distances of 3.971 and 4.386 Å, whereas two neighboring [2ClBz2NH2Py]+ cations from a dimer by the short Cl···Cl interaction with a distance of 3.585 Å. The cations and anions are linked by N···π, S···π interactions and C-H···N, C-H···S hydrogen bonds. Magnetic susceptibility measurements in the temperature range 2–300 K show that the salt shows characteristic of spin-gap with Δ/kb = 789.1 K.