Thermal behaviour of new biological active cadmium mixed ligands complexes |
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| Authors: | Mihaela Badea Rodica Olar Dana Marinescu Veronica Lazar Carmen Chifiriuc Gina Vasile |
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| Affiliation: | (1) Faculty of Chemistry, Department of Inorganic Chemistry, University of Bucharest, 90-92 Panduri St., 050663 Sector 5 Bucharest, Romania;(2) Faculty of Biology, Department of Microbiology, University of Bucharest, 1-3 Aleea Portocalilor Str., 060101 Sector 6 Bucharest, Romania;(3) Department of Agrochemistry, University of Agronomical Sciences and Veterinary Medicine, Bd. Marasti 59, Bucharest, Romania |
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| Abstract: | This paper reports the investigation on the thermal stability of new complexes with mixed ligands of the type [Cd(NN)(C3H3O2)2(H2O)m]·nH2O [(1) NN: 1,10-phenantroline, m = 1, n = 0; (2) NN: 2,2′-bipyridine, m = 0, n = 1.5 and (C3H3O2): acrylate anion]. The IR data indicate a bidentate coordination mode for both heterocyclic amine and acrylate. The in vitro qualitative and quantitative antimicrobial activity assays showed that the complexes exhibited variable antimicrobial activity against planktonic as well as biofilm embedded Gram-negative (Escherichia coli, Klebsiella sp., Proteus sp., Salmonella sp., Shigella sp., Acinetobacter boumani, Pseudomonas aeruginosa), Gram-positive (Bacillus subtilis, Staphylococcus aureus) and fungal (Candida albicans) strains, reference and isolated ones from the hospital environment. The thermal behaviour steps were investigated in synthetic air flow. The thermal transformations are complex processes according to TG and DTA curves including dehydration, amine as well as acrylate thermolysis. The final products of decomposition are the most stable metal oxides. |
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