Nano-synthesis, Biological Efficiency and DNA Binding Affinity of New Homo-binuclear Metal Complexes with Sulfa Azo Dye Based Ligand for Further Pharmaceutical Applications

  • Fawaz A. Saad
  • Hoda A. El-GhamryEmail author
  • Mohammed A. Kassem
  • Abdalla M. Khedr


Five novel nanometric homo-binuclear complexes have been synthesized by the reaction of Cu(II), Co(II), Ni(II), Mn(II) and Zn(II) salts with a new azo dye 4-(2,4-dihydroxy-phenylazo)-N-thiazol-2-yl-benzenesulfonamide (H2L) with the aim to develop neoteric antitumor drugs. H2L has been prepared by coupling of sulfathiazole with resorcinol in order to comprise the bioactivities of sulfonamide part and azo group in the formed metal complexes which greatly enhance their bio-efficiencies. The ligand and complexes have been fully characterized using various spectral and analytical techniques. The obtained data indicated a dibasic tetradentate nature of ligand which coordinated via deprotonated phenolic oxygen, one azo group nitrogen, N-atom of thiazole ring, and sulfonamide oxygen forming tetrahedral geometry around the central metal ions. XRD data confirmed the crystalline nature of ligand and amorphous nature of the complexes. TEM images proved nanometeric size of complexes particles. The data of antimicrobial screening revealed that metal complexes are more potent than the azo dye ligand against varies micro-organisms. Anticancer activities of all compounds were evaluated against human liver carcinoma cells (HepG-2) and breast carcinoma cells (MCF-7). Cu(II) complex showed the highest anticancer activity (IC50 = 23.6 µg/ml) against HepG-2 cells. Co(II) complex displayed the greatest anticancer activity (IC50 of 7.67 µg/ml) contra MCF-7 cells. Electronic absorption and viscosity studies proved that H2L and complexes interact with DNA by intercalation binding and electrostatic force groove binding modes, respectively. The results of this study ascertain that Cu(II) and Co(II) complexes are very favorable candidates for further applications in cancer therapy.


Nano-meter complexes Sulfathiazole Characterization Anticancer DNA binding 



This paper contains the results and findings of a research project that is funded by King Abdulaziz City for Science and Technology (KACST) Grant No. 37–175.

Supplementary material

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Supplementary material 1 (DOCX 311 KB)


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Authors and Affiliations

  • Fawaz A. Saad
    • 1
  • Hoda A. El-Ghamry
    • 1
    • 2
    Email author
  • Mohammed A. Kassem
    • 1
    • 3
  • Abdalla M. Khedr
    • 1
    • 2
  1. 1.Department of Chemistry, Faculty of Applied ScienceUmm Al-Qura UniversityMakkahSaudi Arabia
  2. 2.Chemistry Department, Faculty of ScienceTanta UniversityTantaEgypt
  3. 3.Chemistry Department, Faculty of ScienceBenha UniversityBenhaEgypt

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