Showing papers by "A. B. P. Lever published in 1973"

Isotopic Studies of the Metal–Ligand Bond. Part III. The Far Infrared Spectra of Some Tetragonal Diamine Complexes of Cobalt(II) and Nickel(II): Studies of the Metal–Nitrogen Bond, as a Function of Metal Ion and of Spin State

Abstract: The far infrared spectra of 35 complexes of the formula M(diamine)2X2 are reported where M = Co(II) and Ni(II), X = Cl−, Br−, I−, NO3−, SCN−, ClO4−, and AgI2− and the diamine is ethylenediamine or ...

Isotopic Studies of the Metal–Ligand Bond. Part IV. Variable Temperature and Isotopic Studies of the Metal–Ligand Vibrations in Substituted Pyridine Metal Dihalides. Complexes of Cobalt(II), Nickel(II), and Copper(II)

Abstract: 'The far infrared spectra (50&200 cm-I) of a series of picoline and ethylpyridine derivatives of cobalt(II), nickel(II), and copper(I1) are reported. Metal-ligand assignments are based on isotopic substitution experiments with 65C~ and 62Ni. LOW temperature data are also reported and it is noted that the energies of metal-ligand modes are much more sensitive to temperature than the energies of purely ligand vibrations. This observation is discussed and it is suggested, with some caution, that the low temperature behavior may be used as a guide to band assignment.

Far infrared spectra of bis(aminoacidato)copper(II) complexes: assignment of copper ligand vibrations by isotopic substitution.

Abstract: Application of isotopic substitution with 65Cu to the study of the far infrared spectra of Bis(L-aminoacidato)copper(II) complexes reveals that metal sensitive vibrations lie at ca. 380 and ca. 330 cm−1. They are tentatively assigned as ν(Cu-N) and ν(Cu-O) respectively.

Higher oxidation state iron and cobalt phthalocyanine derivatives. Phthalocyanine radical cation complexes

Abstract: Reaction of cobalt(II) phthalocyanine (CoPc) with thionyl chloride and with bromine leads to the formation of CoPcCl2 and CoPcBr2, respectively; magnetic i.r., oxidative titration, and e.s.r. data indicate these complexes to contain a phchalocyanine radical species, characterised in the solid state for the first time.

The Application of Isotopic Substitution and Variable Temperature in the Identification of Metal Ligand Modes in the Vibrational Spectra of Metal Complexes

Abstract: Isotopic and variable temperature studies of the far infrared spectra of a series of metal complexes suggest that, under certain circumstances, metal ligand modes may increase in energy markedly as the sample is cooled, whilst internal ligand modes are generally almost insensitive to temperature change.

Higher oxidation state iron and cobalt phthalocyanine derivatives, phthalocyanine radical cation complexes

Abstract: Thionylchlorid und Brom reagieren mit Kobalt(II)-phthalocyanin (CoPc) zu CoPcClz bzw. CoPcBr2.