European Journal of Chemistry

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

Main Article Content

Pedro Oliver Dunstan
Abdul Majeed Khan


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.


icon graph This Abstract was viewed 1099 times | icon graph Article PDF downloaded 671 times

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

Article Details

Crossref - Scopus - Google - European PMC

[1]. Ciccarese, A.; Clemente, D. A.; Fanizzi, F. P.; Marzotto, A.; Valle, G. Acta Crystallogr. C 1998, 54, 1779-1781.

[2]. Smekal, Z.; Travnycek, Z.; Mrozimski, J.; Marek, J. Inorg. Chem. Commun. 2003, 65, 1395-1399.

[3]. Bera, M.; Ribas, J.; Wong, W. T.; Ray, D. A. Inorg. Chem. Commun. 2004, 7, 1242-1245.

[4]. Johnstone, N. C.; Aazam, E. S. Hitchcock, P. B.; Fulton, J. R. J. Organomet. Chem. 2010, 695(2), 170-176.

[5]. Marzotto, A.; Clemente, D. A.; Valle, G. Acta Crystallogr. C 1988, 54, 27-29.

[6]. Khalaj, A.; Adibpour, N.; Shahverdi, A. R.; Danaeshtalab, M. Eur. J. Med. Chem. 2004, 39, 699-705.

[7]. Bali, A.; Sharma, K.; Bhalla, A.; Bala, S.; Reddy, D.; Singh, A.; Kumar, A. Eur. J. Med. Chem. 2010, 45, 2656-2662.

[8]. Aytemir, M. D.; Calis, U.; Ozalp, M. Arch. Pharm. Res (Weinheim) 2004, 337, 281-288.

[9]. Sapa, J.; Filipek, B.; Nowinski, L. Pharmacol Rep. 2011, 63, 455-463.

[10]. Patel,I. J.; Parmar, S. J. E-J. Chem. 2010, 7, 617-623.

[11]. Pietrzycka, A.; Stepniewski, M.; Waskielewicz, A. M.; Marona, H. Acta Pol. Pharm. Drug Res. 2006, 63, 19-24.

[12]. Rajabalian, S.; Foroumadi, A.; Shafiee, A.; Emami, S. J. Pharm. Pharm. Sci. 2007, 10, 153-158.

[13]. Niederl, J. B.; Sozzi, J. A. Microanalisis elemental organico. 1st edition, Buenos Aires, Methopress, 1958.

[14]. Koltoff, I. M.; Sandall, E. B. Tratado de Quimica Analitica Cuantitativa, 3a edicion, Libreria y Editorial Nigar S. R. L., Buenos Aires, 1956.

[15]. Flaschka, H. A. EDTA titrations: An Introduction to Theory and Practice, 2nd edition, Pergamon Press, London, 1964.

[16]. Dunstan, P. O. J. Chem. Eng. Data 1999, 44, 243-247.

[17]. Herington, E. F. Pure Appl. Chem. 1974, 40, 391-450.

[18]. Ahuya, I. S. Inorg. Chim. Acta 1969, 3, 110-112.

[19]. Ahuja, I. S.; Garg, A. Inorg. Nucl. Chem Lett. 1973, 7, 937-940.

[20]. Pellacani, G. C.; Battistuzzi, R.; Marcotrigiano, G. J. Inorg. Nucl. Chem. 1973, 35, 2243-2247.

[21]. Soriego, R.; Costamagna, J. A. J. Inorg. Nucl. Chem. 1971, 33, 1528-1532.

[22]. Reedijk, J.; Van Leeuwem, P. W. N. M.; Groenveld, W. L. Recl. Trav. Chim. Pay-B. 1968, 87, 129-141.

[23]. Lever, A. B. P. J. Chem. Educ. 1968, 45, 711-712.

[24]. Bolster, M. W. G. The coordination chemistry of aminophosphinoxide and related compounds, Thesis, Leiden, 1972 pp. 88, 89, 95, 98, 100.

[25]. Dunstan, P. O. J. Chem. Eng. Data. 2009, 54, 842-846.

[26]. Dunstan, P. O. Thermochim. Acta 2004, 409, 19-24.

[27]. Dunstan, P. O. Thermochim. Acta 1997, 303, 209-218.

[28]. Wagmam, D. D.; Evans, W. H.; Parker, V. B.; Schumm, R. H. Halow, I.; Churney, S.; Nuttall, R. L. J. Phys. Chem. Ref. Data 1982, 2, 50-191.

[29]. Skinner, H. A.; Pilcher, G. Q. Rev. Chem. Soc. 1963, 17, 264-288.

Supporting Agencies

TWAS (The Academy of Sciences for the Developing World) and CNPq (Conselho Nacional de Pesquisa)
Most read articles by the same author(s)

Dimensions - Altmetric - scite_ - PlumX

Downloads and views


Download data is not yet available.


Metrics Loading ...
License Terms

License Terms


Copyright © 2024 by Authors. This work is published and licensed by Atlanta Publishing House LLC, Atlanta, GA, USA. The full terms of this license are available at and incorporate the Creative Commons Attribution-Non Commercial (CC BY NC) (International, v4.0) License ( By accessing the work, you hereby accept the Terms. This is an open access article distributed under the terms and conditions of the CC BY NC License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited without any further permission from Atlanta Publishing House LLC (European Journal of Chemistry). No use, distribution, or reproduction is permitted which does not comply with these terms. Permissions for commercial use of this work beyond the scope of the License ( are administered by Atlanta Publishing House LLC (European Journal of Chemistry).