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Articles by M. Saidul Islam
Total Records ( 4 ) for M. Saidul Islam
  Jahanara Nasrin and M. Saidul Islam
  The study was extended to isolate the peroxo complexes of Zr (IV) containing organic acid and amine bases. The Zr (IV) complexes have been found to oxidize allyl alcohol and triphenylphosphine as well as triphenylarsine to their respective oxides. The analytical data are in good agreement with the proposed empirical formulae of the present complexes. The complexes display v(C = O) bands at ~1630 cm-1 and v(C-O) bands at ~1412 cm-1 significantly lower than the values of amino acid (~1650 and ~1450 cm-1). These indicate the coordination of amino acid through their carboxylate anion. The broad band observed at about 3217-3350 cm-1 for v (N-H) modes indicate the coordination of amino group through nitrogen atom of amino acid. The metal peroxo grouping gives rise to three IR active vibrational modes. These are predominantly O-O stretching v1, the symmetric M-O stretch v2 and the antisymmetric M-O stretch v3. The magnetic moment values indicated that these complexes were diamagnetic in nature suggesting no changes in their oxidation states of the metal ions upon complexation. These data also consistent with six fold coordination of Zr (IV). The electronic spectral data of the complexes showed bands in the region 230-372 nm due to the charge transfer band only. All the complexes of Zr (IV) did not show any remarkable antibacterial activity. It is interesting to note that these complexes were found to be fully inactive against the three pathogenic fungi A. niger, A. fumigatus and A. flarus. Moreover, all the complexes of Zr (IV) metals showed toxic effect against the brine shrimp.
  Jahanara Nasrin and M. Saidul Islam
  This study describes with the preparation, characterization and bioactivity of peroxo complexes [A: MoO(O2)(gly)(Q); B: MoO(O2)(ala)(2-pic)]of Mo(VI)] containing organic acid and amine bases. Both the complexes A and B were characterized by a variety of physicochemical techniques, viz., elemental analyses, molar conductivity, IR, NMR and electronic spectral studies. The analytical data were in good agreement with the proposed emperical formulae of both the complexes. The molar conductance values indicated both the complexes are non-electrolytes in DMF revealing that the anions are covalently bonded in all the cases. The magnetic moment values indicated that both the complexes were dimagnetic in nature suggesting that there were no changes in the oxidation states of the metal ions upon complexation. The electronic spectral data of the complexes A and B showed bands at 315-355 nm region due to the charge transfers band only. The antimicrobial properties of the peroxo complexes of Mo(VI) indicated that both the complexes were stronger antibacterial and antifungal agents. However, the highest antifungal activity was shown in the complex B against A. niger (16 mm) while the complex A of Mo(VI) showed lowest activity (10 mm). The MIC experiment showed that the complex B of Mo(VI) were more potent against all the bacteria tested than the complex A. Results showed that the complex A of Mo(VI) exhibits more toxic to brine shrimp compared to complex B of Mo(VI) indicating the lower values of LC50 for both the exposure 16 and 36 h.
  M. Saidul Islam , Md. Belayet Hossain and Md.Yeamin Reza
  Mixed-ligand transition metal complexes of Co (II) ions were synthesized, where, Maleicacid as a primary ligands and heterocyclic amine bases as a secondary ligands have been used, respectively. Moreover, mixed-ligands transition metal complexes of Fe (III) ions were also synthesized by the same way. Their conventional physical and chemical analysis has been done. Their anti-bacterial and anti-fungal activity has been evaluated. Disc diffusion methods were employed for anti-microbial assays against 14 pathogenic bacteria (5 g positive and 9 g negative) and 14 fungi. The complexes containing 8-hyroxy-quinoline as secondary ligand were much more microbial activity than the other complexes. In addition, the complexes K[Co(II)(ME)(8-HQ)] shows the highest anti bacterial activity against all bacterial tasted (when, ME=C4 H2O4 and 8-HQ=C9H6NO).
  M. Saidul Islam , M. Akhter Farooque and M.A.K. Bodruddoza
  New complex of Cu+2 ion with Schiff base derived from the condensation of m-aminophenol with o-hydroxybenzaldehyde has been synthesized. The complex has the formulae [Cu(L)(NN)]. The complex was characterized on the basis of elemental analyses, melting points, conductance and magnetic measurements, infra-red and electronic spectra. The physico-chemical studies suggest a square planar structure for Cu+2 complex. Antineoplastic activity of this complex has been carried out. The antineoplastic activity of the complex was carried out on Swiss Albino male mice.
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