Thio derivatives of β-diketones and their metal chelates. XXIII. Adducts of nickel(II) chelates of fluorinated Monothio-β-diketones with nitrogen heterocycles

Abstract

Paramagnetic adducts of the nickel(11) chelates of the fluorinated monothio-β-diketones RC(SH)=CHCOCF₃ (R = β-naphthyl, p-ClC₆H₄, m-ClC₆H₄, m-BrC₆H₄, m-MeC₆H_4, 3,4-Cl₂C₆H₃) have been obtained with pyridine, y-picoline, 2,2'-bipyridyl, and 1,l0-phenanthroline. They are of the type NiL₂(base)₂ (L = RCS=CHCOCF₃; base = py, γpic, ½bpy, ½phen). With 2,2',2"-terpyridyl two types of adduct were isolated: (a) mononuclear NiL₂(trpy) and (b) trinuclear Ni₃L₆(trpy)₂. The infrared spectra of all the adducts display v(C-O) in the range 1552-1580 cm^-l; this band is characteristic of a bidentate monothio-β-diketonato ligand. The spectra of the mononuclear terpyridyl adducts display in addition a v(C=O) band at c. 1650 cm^-1, indicating that one carbonyl group is not coordinated.