Some Studies in Inorganic Complexes. VI. Nickel(II) with 2-Picolylamine

Abstract

Complexes of the type Nipic₂X₂, Nipic₃X₂.nH₂O, and Nipic₃(ClO₄)₂.H₂O have been prepared and studied, where X is Cl, Br, or I and pic is the chelating ligand 2-picolylamine. Conductance measurements in nitrobenzene, nitromethane, methanol, and water show that the blue compounds Nipic₂X₂, whilst being hexacovalent complexes in the solid state, are progressively ionized in the respective solvents as halogen is replaced by solvent molecules. Conductance measurements also verified a hexacovalent structure for the Ni pic₃²⁺ ion complex whose salts are bi-univalent electrolytes. Magnetic measurements show that a11 the complexes are paramagnetic with a mean moment of 3.0 B.M. Their absorption spectra in the near ultraviolet region are characteristic of that of the ligand. A study in the visible spectrum was also made.