Metal complexes of aromatic amine n-oxides

The Structural and Magnetic Properties of First‐Row Transition‐Metal Dimers Containing Hydroxo, Substituted Hydroxo, and Halogen Bridges

The reaction of (ArL)Co(py) with tBuN3 afforded the isolable three-coordinate Co–imido complex (ArL)Co(NtBu), which is paramagnetic at room temperature. Variable-temperature (VT) 1H NMR spectroscopy, VT crystallography, and magnetic susceptibility measurements revealed that (ArL)Co(NtBu) undergoes a thermally induced spin crossover from an S = 0 ground state to a quintet (S = 2) state. The reaction of (ArL)Co(py) with mesityl azide yielded an isolable S = 1 terminal imido complex that was converted into the metallacycloindoline (ArL)Co(κ2-NHC6H2-2,4-Me2-6-CH2) via benzylic C–H activation.

Co(III) imidos exhibiting spin crossover and C-H bond activation.

Complexes of semicarbazones and thiosemicarbazones with nickel(II)

The complexes of the Mn (II), Fe (II), Co(II), Ni(II), and Cu(II) halides with pyrazine (1,4-diazine), pyrimidine (1,3-diazine), and pyridazine (1,2-diazine) were prepared and studied by various physical methods. Reflectance spectra, infrared spectra from 4000-80 cm−1, and magnetic moments were determined. The data are suggestive of an octahedral environment involving halide and azine bridging in the 1: 1 complexes, and an octahedral environment involving halide bridging and terminal azines in the 1: 2 complexes.

Transition Metal(II) Complexes of the Azines

The thermal decomposition of metal complexes—III

The far infra-red spectra of some transition metal halide complexes with substituted pyridines

Complexes have been prepared between iron(II), copper(II), zinc(II), and cadmium(II) halides and pyridine, α-, β-, and γ-picoline, 2,6-lutidine, and 2,4,6-collidine. Where possible, structural types are identified. The present complexes are compared with similar compounds of chromium(II), manganese(II), cobalt(II), and nickel(II).

Pyridine complexes of iron(II), copper(II), zinc(II), and cadmium(II) halides

The thermal decomposition of metal complexes—IV: The preparation and thermal decomposition of some pyridine and substituted-pyridine complexes of nickel (II) halides

J.R. Allan

Papers

The thermal decomposition of metal complexes—III

The far infra-red spectra of some transition metal halide complexes with substituted pyridines

Pyridine complexes of iron(II), copper(II), zinc(II), and cadmium(II) halides

The thermal decomposition of metal complexes—IV: The preparation and thermal decomposition of some pyridine and substituted-pyridine complexes of nickel (II) halides