cis- and trans-Planar Four-Coordinated Palladium(II)
Azo-5-Pyrazolone (Thione) Complexes with N₂O₂-
and N₂S₂-Ligand Environment: Synthesis and Structure

A. S. Burlov^a, A. I. Uraev^a, K. A. Lysenko^b, I. S. Vasil’chenko^a, S. A. Mashchenko^a,
E. V. Korshunova^a, D. A. Garnovskii^{a, c}, E. D. Garnovskaya^a, and G. S. Borodkin^a

^a Research Institute of Physical and Organic Chemistry, Southern Federal University,
pr. Stachki 194/2, Rostov-on-Don, 344090 Russia

^b Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, ul. Vavilova 28, Moscow, 119991 Russia

^c Southern Scientific Center, Russian Academy of Sciences, pr. Chekhova 41, Rostov-on-Don, 344006 Russia

e-mail: garn@ipoc.rsu.ru

Received April 2, 2015

Abstract—Three novel palladium(II) azo complexes (I–III), whose compositions and structures were estab-
lished from C, H, N, S elemental analysis and IR and ¹H NMR spectroscopy, were synthesized by boiling pal-
ladium(II) acetate and some pyrazolazo derivatives, namely, 2-iso-propyl(phenyl)-3-methyl-4-[(4-methylphe-
nyl)diazenyl]-1H-pyrazol-5-one and 1-iso-propyl-3-methyl-4-[(4-methylphenyl)diazenyl]-1H-pyrazol-5-
thione (HL_(a–c)) in an acetone/methanol (1 : 1) mixture. X-ray diffraction analysis was performed for complexes
I and III. Complex I with an N₂O₂-ligand environment was established to have a trans-planar configuration for
the PdN₂O₂ chelate ring, while the formation of the cis-planar structure by the PdN₂S₂ chelate ring was typical
for complex III.

DOI: 10.1134/S0036023615120062

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