Complexes of nickel(II) with o-nitrosophenols (mono-oximes of ortho-benzoquinones)

Abstract

Complexes of the type Ni(qo)₂ and Ni(qo)₂,2py have been prepared, where qoH is 4-chloro-2-nitrosophenol, 4-bromo-2-nitrosophenol, 4-methyl-2-nitrosophenol, and 4-t-butyl-2-nitrosophenol and py is pyridine. The magnetic susceptibilities and electronic, i.r., and mass spectra of the complexes have been investigated. The complexes Ni(qo)₂ are dimeric in the solid, and, except when qoH = 4-bromo-2-nitrosophenol, mass spectrometry shows evidence of association in the vapour. The two compounds which were sufficiently soluble (qoH = 4-chloro-2-nitrosophenol and 4-t-butyl-2-nitrosophenol) are also dimeric in chloroform solution. The pyridine adducts are monomeric. The complex Ni(qo)₂, 2H₂O (qoH = 4-chloro-2-nitrosophenol) is polymeric.