Abstract
The preparation of the complexes PdLX, [Pd(HL) 2]X 2 and PdL 2 (X = Cl, Br; 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 crystal and molecular structure of PdLBr has been determined by single-crystal 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 protonation constants of the ligand, K a1 and K a2, were determined by spectrophotometry and the logarithms of their values were found to be equal to 11.43 ± 0.02 and 3.98 ± 0.02.
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