Lanthanum(III) and prasedymium(III) complexes with piperazine dithiosemicarbazones |
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Authors: | S Tripathi S K Sengupta O P Pandey |
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Institution: | (1) Chemistry Department, D.D.U. Gorakhpur University, Gorakhpur, 273009, India |
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Abstract: | Lanthanum(III) and praseodymium(III) complexes of the type Ln(L)Cl(H2O)]2 (Ln = La(III) or Pr(III); LH2 = dithiosemicarbazone ligands derived from piperazine dithiosemicarbazide and benzaldehyde, 4-nitrobenzaldehyde, and 2-methoxybenzaldehyde)
have been synthesized in methanol in the presence of sodium hydroxide. The complexes have been characterized by elemental
analyses, molecular weight, molar conductance, electronic absorption, IR, and 1H and 13C NMR spectral studies. Nephelauxetic ratio, covalency parameter, and bonding parameter for these complexes have also been
calculated. Thermal studies of the complexes have been carried out using TG, DTG, and DSC techniques. Kinetic parameters, such as apparent activation energy and order of reaction, were determined by the Coats-Redfern
graphical method. The heats of reaction for different reaction steps were calculated from DSC curves.
The article was submitted by the authors in English. |
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