STUDY OF STRUCTURE AND ELECTRONIC SPIN-DE NSITY DISTRIBUTION OF CO(II) AND NI(II) COMPLEXES IN SOLUTION, BY NMR-SPECTROSCOPY

This paper presents the structure obtained by NMR spectroscoPY and Ron tgenographic analysis on some M(BTFA)2(A)2 and [M(acac)2(A)2]-type coo rdinative species where M represents Co(II) or Ni(II), BTFA-benzoiltri floracetone, acacacetylacetone A-pyridine beta,-gamma-picoline or wate r. A distinction between the contact component and the pseudocontact o ne of the isotropic shifts from the H-1-F-19 NMR spectra is made by us ing these data. The geometrical structure of the solution complex has been established dy employing both the pseudocontact component and the bi-polar surfaces. The spin electronic density of the hydrogen and fl uorine atoms from the molecular structure have been computed by means of the Fermi contact component.