Open AccessSynthesis and Characterization of Cu(II), Zn(II), Cd(II) and Hg(II) Complexes of Rabeprazole
Author(s) -
Salma Begum,
Humaira Yeasmin,
Tapas Debnath,
Aasiya Shaikh,
Pradip K. Bakshi
Publication year - 2017
Publication title -
the dhaka university journal of science
Language(s) - English
Resource type - Journals
eISSN - 2408-8528
pISSN - 1022-2502
DOI - 10.3329/dujs.v65i2.54524
Subject(s) - chemistry , metal ions in aqueous solution , ligand (biochemistry) , inorganic chemistry , denticity , metal , differential scanning calorimetry , nuclear chemistry , zinc , thermogravimetric analysis , crystallography , organic chemistry , biochemistry , physics , receptor , thermodynamics
Rabeprazole (RPZH) (available as rabeprazole sodium, RPZNa) is a proton pump inhibitor (PPI), widely used for the treatment of acid-related diseases in the stomach and duodenum. It is a weak base with pKa= 4.9 and show a strong ability to form complexes with transition and nontransition metal ions. Its complexes with Cu(II), Zn(II), Cd(II) and Hg(II) have been synthesized and characterized by solubility, melting point, metal content estimation, IR and UV-Visible spectral analysis, magnetic measurement, thermogravimetric analysis, differential scanning calorimetry and X-ray powder diffraction studies. On the basis of metal contents, the complexes have been formulated as [Cu(RPZ)(H2O)Cl], [Zn(RPZ)2], [Cd(RPZ)2].2H2O and [Hg(RPZ)2].H2O. Rabeprazole sodium (RPZNa) loses Na+ ion in solution yielding a monoanionic RPZ that behaves as a bidentate ligand and coordinates through C-N- and S=O groups with the divalent metal ion. Tetrahedral geometry of all complexes is proposed. Zn(II), Cd(II) and Hg(II) complexes have 1:2 metal to ligand stoichiometry while Cu(II) complex possesses ligand to metal ratio of 1:1. Cu(II) and Zn(II) complexes have also been screened for their antibacterial and antifungal activities against several bacteria and fungi.
Dhaka Univ. J. Sci. 65(2): 157-162, 2017 (July)