Synthesis and Characterization of Crown Ethers

Kiraz A., YILDIZ M., dülger B.

ASIAN JOURNAL OF CHEMISTRY, vol.21, no.6, pp.4495-4507, 2009 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 21 Issue: 6
  • Publication Date: 2009
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.4495-4507
  • Çanakkale Onsekiz Mart University Affiliated: Yes


Crown ether ligands of Schiff base type (6-17) have been synthesized by the reaction of 2-hydroxybenzaidehyde, 2-hydroxy-5-methoxybenzaldehyde 2-hydroxy-5-bromobenzaldehyde, 2-hydroxy-5-chlorobenzaldehyde, 2-hydroxy-5-nitrobenzaldehyde and 2-hydroxy-1-naphthaldehyde with 6,7,8,14-tetrahydrodibenzo[f,i][ 1,5]dioxecine-2,12-diamine (4) and 7,9,10,16-tetrahydro-6H-dibenzo[h,k][ 1,4,7]-trioxacyclododecine-2,14-diamine (5). The structures of Schiff base crown ethers have been investigated by elemental analysis, IR, UV-visible, H-1 NMR, C-13 NMR and MS spectroscopic data. In solution, all Schiff bases exist as equilibrium mixtures of enol-imine and keto-imine tautomers. For four Schiff bases (10, 11, 16, 17). the keto-imine form has been found to be dominant in the DMSO. The antimicrobial activities of the compounds are evaluated using disk diffusion method in dimethyl sulfoxide (DMSO) against 9 bacteria and 5 yeast. cultures. The obtained results from disk diffusion method are assessed in side-by-side comparison with those of penicillin-G, ampicillin, cefotaxime, vancomycin, oflaxacin, tetracycline 8 antibacterial agents and nystatin, ketaconazole and clotrimazole as commercial antifungal agents. In most cases, the compounds show broad-spectrum (Grain-positive and Gram-negative bacteria) activities that are comparatively either, slightly less active or equipotent to, antimicrobial agents in the comparison tests.