Preparation and spectral properties of di-2-pyridylamine complexes of nickel(II)

Abstract

The preparations are described of di-2-pyridylamine (= L) complexes of nickel(II) of the types NiL₃X₂(X = ClO₄ or l), NiL₂X₂(X = Cl, Br, or NCS), NiLX₂(X = Cl, Br, or l) and some hydrates. Magnetic measurements and electronic and infrared (400–200 cm.^–1) spectra are reported and discussed. The ligand field strength of L in NiL₃²⁺ is ∼11,200 cm.^–1. All the NiL₂X₂ compounds are paramagnetic. Pseudo-tetrahedral structures are suggested for NiLX₂(X = Br or l), but NiLCl₂ is polymeric octahedral.