COORDINATING PROPERTIES OF 2-ACETYLPYRIDINE THIOSEMICARBAZONE - PALLADIUM(II) COMPLEXES WITH NEUTRAL AND DEPROTONATED LIGAND - X-RAY STRUCTURE OF BROMO(2-ACETYLPYRIDINE THIOSEMICARBAZONATO) PALLADIUM(II)
D. Kovalademertzi et al., COORDINATING PROPERTIES OF 2-ACETYLPYRIDINE THIOSEMICARBAZONE - PALLADIUM(II) COMPLEXES WITH NEUTRAL AND DEPROTONATED LIGAND - X-RAY STRUCTURE OF BROMO(2-ACETYLPYRIDINE THIOSEMICARBAZONATO) PALLADIUM(II), Polyhedron, 13(12), 1994, pp. 1917-1925
The preparation of the complexes PdLX, [Pd(HL)2]X2 and PdL2 (X = Cl, B
r; HL and L the neutral and deprotonated ligand) is described. The new
complexes have been characterized by elemental analyses, conductivity
measurements and spectroscopic (IR and UV-vis) studies and the crysta
l and molecular structure of PdLBr has been determined by single-cryst
al X-ray diffraction. The palladium atom has a square planar geometry
with three donor atoms (NNS) coming from L to form a planar tricyclic
ligating system, and one bromide atom. All data are discussed in terms
of assigned structural type and the nature of the bonding. The proton
ation constants of the ligand, Ka1 and Ka2, were determined by spectro
photometry and the logarithms of their values were found to be equal t
o 11.43 +/- 0.02 and 3.98 +/- 0.02.