European Journal of Chemistry

Synthesis, characterization and thermochemistry of piperazine complexes of bivalent metal bromides

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Published: Sep 30, 2013
DOI: https://doi.org/10.5155/eurjchem.4.3.250-254.791
Keywords:
Adducts, Metal bromides, Transition metals, Coordinated bonds, Enthalpies of solution, Thermochemical parameters
Section
Research Article
Issue
Vol. 4 No. 3 (2013): September 2013
Dates
Received 2013-04-03
Accepted 2013-06-03
Published 2013-09-30


Main Article Content

Pedro Oliver Dunstan
Instituto de Quimica, Universidade Estadual de Campinas, C. P. 6154, 13084-971, Campinas, Sao Paulo, Brazil
Abdul Majeed Khan
Instituto de Quimica, Universidade Estadual de Campinas, C. P. 6154, 13084-971, Campinas, Sao Paulo, Brazil

Abstract

Complexes of bivalent metal bromides with piperazine were prepared in hot ethanol solution. They have the general formula: [MBr2(pipz)n], where M = Mn(II), Fe(II), Co(II), Ni(II), Cu(II) or Zn(II); pipz = piperazine; n = 1 or 1.5. They were characterized by melting point measurements, elemental analysis, TG/DTG-DSC curves, IR and electronic spectroscopy. The enthalpies of solution of the complexes, salts and ligand were measured by thermo-chemical cycles and several thermochemical parameters were determined. The mean standard enthalpies of the metal-nitrogen coordinated bonds and the enthalpies of gaseous complex formation were also determined.

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Dunstan, P. O.; Khan, A. M. Synthesis, Characterization and Thermochemistry of Piperazine Complexes of Bivalent Metal Bromides. Eur. J. Chem. 2013, 4, 250-254.

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TWAS (The Academy of Sciences for the Developing World) and CNPq (Conselho Nacional de Pesquisa)
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