Abstract
Ligands with Schiff bases are obtained in the condensation of propylenediamine (pda) or 2,2-dimethylpropylenediamine (dmpda) with acetylacetone (Hacac) in the 1:2 molar ratio. The ligands are characterized by the elemental analysis methods, T melt = 90–92 °C for pda(Hacac)2 (pda(acac)2 is N,N′-propylene-bis(acetylacetoniminato) (2-)), T melt = 84–86 °C for dmpda(Hacac)2 (dmpda(acac)2 is N,N′-2,2-dimethylpropylene-bis(acetylacetoniminato) (2-)). The tautomerism of the ligands is established by the single crystal X-ray diffraction (XRD) analysis, IR spectroscopy, and 1H, 13C NMR spectrometry. The synthesized complexes [Cu(pda(acac)2)] (1), T melt = 121–122 °C and [Cu(dmpda(acac)2)] (2), T melt = 156–158 °C are studied by the XRD method. In both complexes, copper atoms have a planar square geometry, and the chelate bond lengths and angles are: Cu-O ≈ Cu-N 1.903(2)–1.942(3) Å, ∠O-Cu-N = 94.44(12)–94.99(12)° for 1 and Cu-O ≈ Cu-N 1.909(1)–1.943(2) Å, ∠O-Cu-N = 94.63(6)° for 2. By the thermogravimetric method it is found that both complexes can be passed practically quantitatively into the gas phase.
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Original Russian Text © 2014 S. I. Dorovskikh, N. V. Kuratieva, S. V. Tkachev, S. V. Trubin, P. A. Stabnikov, N. B. Morozova.
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Translated from Zhurnal Strukturnoi Khimii, Vol. 55, No. 6, pp. 1124–1131, November–December, 2014.
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Dorovskikh, S.I., Kuratieva, N.V., Tkachev, S.V. et al. Copper(II) complexes with Schiff bases: Structures and thermal behavior. J Struct Chem 55, 1067–1074 (2014). https://doi.org/10.1134/S0022476614060092
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DOI: https://doi.org/10.1134/S0022476614060092