title: An in vitro antibacterial and antifungal effects of cadmium(II) complexes of hexamethyltetraazacyclotetradecadiene and isomers of its saturated analogue.
abstract: OBJECTIVE
  To evaluate the antibacterial and antifungal effects of cadmium(II) complexes with hexamethyltetraazacyclotetradecadiene ligands.
  
  
  METHODS
  Five coordinated square pyramidal cadmium(II) complexes and six coordinated square octahedral cadmium(II) complexes have been synthesized by interaction of 5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene (denoted by L.2HClO4) and C-chiral isomers of its saturated analogue (denoted by 'teta' and 'tetb') with different salts of Cd(2+) ion [e.g. CdI2, Cd(NO3)2·6H2O, CdCl2·2H2O and Cd(ClO4)2·6H2O] in methanolic solution. Complexes of the ligands were investigated for antibacterial activity by disc diffusion method and antifungal effect by poisoned food technique.
  
  
  RESULTS
  The newly synthesized cadmium(II) complexes of the ligands were screened as potential antimicrobial agent against a number of medically important bacteria (Staphylococcus aureus, Bacillus cereus, Salmonella typhi, Shigella dysenteriae and Escherichia coli) and against two fungi (Candida albicans and Aspergillus aculeatus). The growth inhibiting activity of the ligands and complexes against bacteria and fungi were compared with the standard antibiotic ampicillin and commercially important antifungal agent, griseofulvin respectively. Among them some of the macrocyclic complexes were found to be more fungitoxic and antibacterial than the reference antifungal drug griseofulvin and antibacterial drug ampicillin respectively.
  
  
  CONCLUSIONS
  Hexamethyltetraazacyclotetradecadiene ligands and its complexes could be considered as very potential antibacterial and antifungal agent with further investigation.
authors.affiliation: Department of Chemistry, Mawlana Bhashani Science and Technology University, Santosh, Tangail-1902, Bangladesh.
authors.forename: Foni Bushon
authors.initials: FB
authors.lastname: Biswas
authors.affiliation: Department of Chemistry, University of Chittagong, Chittagong-4331, Bangladesh.
authors.forename: Tapashi Ghosh
authors.initials: TG
authors.lastname: Roy
authors.affiliation: Department of Biochemistry and Molecular Biology, University of Chittagong, Chittagong-4331, Bangladesh. Electronic address: atiarh@yahoo.com.
authors.forename: Md Atiar
authors.initials: MA
authors.lastname: Rahman
authors.affiliation: BGC Trust University Bangladesh, Chittagong, Bangladesh.
authors.forename: Talha Bin
authors.initials: TB
authors.lastname: Emran
keywords: Antibacterial activity; Antifungal activity; Cadmium (II); Macrocyclic complex