Mass-spectrometric investigation of the coordination compounds of oxovanadium(IV), cobalt(II), nickel(II), copper(II), and zinc(II) with ligands based ON S-substituted isothiosemicarbazides,salicyaldehyde, and 3-formylacetylacetone

A general scheme is proposed for the electron impact fragmentation of the coordination compounds of VO(II), Co(II), Ni(II), Cu(II) and Zn(II) with tetradentate chelating ligands based on S-substituted isothiosemicarbazides, salicylaldehyde, and 3-formylacetylacetone and also the corresponding free ligands. It was established that one of the main factors which determine the direction and degree of fragmentation of the complexes is the ability of the central metal atom to change its oxidation state. It was found that complex formation with the free ligands and exchange of the metal in the metal complexes take place as side processes on the walls of the ionization chamber of the mass spectrometer.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 10, pp. 2248–2256, October, 1989.The authors are grateful to M. M. Timoshenko and Yu. V. Chizhov for assistance afforded during the recording of the photoelectron spectra.