Abstract
Thermal decomposition of Ni(II), Pd(II), and Pt(II) complexes of
N
-pyrimidin-2ylthiourea (AllPmTu) have been studied by TG, DTG, and DTA and by electron impact (EI) mass spectra. The complexes have the molecular formulae as [Ni(AllPmTu)Cl
2
(H
2
O)], [Ni(AllPmTu)
2
Cl
2
(H
2
O)
2
], and [M(AllPmTu)Cl
2
], where M = Pd
II
or Pt
II
, and [Pt(AllPmTu)
2
]. The TG curves show that Ni(II) complexes decompose in three stages to yield NiO as a residue, while Pd(II) and Pt(II) decompose in two stages to yield MS residues. The initial mass losses correspond to elimination of allylamine for Pd(II) and Pt(II) complexes but, allyisothiocyanate for both Ni(II) complexes revealing that sulfur atom of thiourea part is involved in coordination to Pd(II) and Pt(II) but does not to Ni(II). Kinetic parameters (
E
#
,
n
, Δ
H
#
, Δ
S
#
, Δ
G
#
) of the decomposition stages are determined and correlated with bonding and structural properties of the complexes. The EI mass spectra of the complexes show fragments corresponding to the evolved and intermediate species.