Antifungal and antitumor activity of heterocyclic thiosemicarbazones and their metal complexes: current status |
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Authors: | Anthony E Liberta Douglas X West |
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Institution: | (1) Department of Biological Sciences, Illinois State University, 61761 Normal, IL, USA;(2) Department of Chemistry, Illinois State University, 61761 Normal, IL, USA |
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Abstract: | More than 75 substituted thiosemicarbazones and a number of metal complexes of each have been assayed for their antifungal activity. Their activity is significantly affected by the substituted groups attached at both1
N and4
N of the thiosemicarbazone moiety. Greatest activity occurs for 2-substituted pyridine thiosemicarbazones with differences observed for 2-formylpyridine, 2-acetylpyridine and 2-benzoylpyridine derivatives and their metal complexes. Further, there are activity differences for4
N-alkyl-,4
N-aryl-,4
N-dialkyl- and 3-azacyclothiosemicarbazones and their metal complexes as well as changes in the substituent size among each of these subgroups. Cu(II) complexes are often more active than the uncomplexed thiosemicarbazones, with the latter showing similar activity to Ni(II) complexes in many instances. The reduction potential of the thiosemicarbazone ligand in a Cu(II) complex, the strength of the ligand field and various spectral properties can be correlated to the inhibitory activity. |
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Keywords: | Apergillus niger Paecilomyces variotii antifungal antitumor thiosemicarbazones |
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