CARBODITHIOATO DERIVATIVES OF WEAK NITROGENOUS NUCLEOPHILES .4. MASS-SPECTRA AND THERMAL-DECOMPOSITION KINETICS OF NI(II) N-CARBODITHIOATESWITH SUBSTITUTED UREAS, CARBAMIC ESTERS AND SULFONAMIDES

Mass spectral and thermal studies by TG/DTG analysis of Ni[S2CN(E)R]2 complexes (where E is CONHPh, CONPh2, COOEt or ArSO2, and R is Me, Bu( n) or Bz) in dynamic nitrogen atmosphere have been carried out to dete rmine their modes of decomposition. In this respect, fragmentation pat terns are given and possible mechanisms are discussed. Reaction orders were estimated employing the Freeman-Carroll equation. A kinetic anal ysis of the thermogravimetric data was performed using the Coats-Redfe rn equation to determine the apparent activation energies and the pre- exponential factor of the Arrhenius equation.