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The interaction between silver(I) ions with 3,5-di(tert-butyl)-1,2-benzenediol (I) and sulfur-containing derivatives of sterically hindered diphenols: 4,6-di(tert-butyl)-3-(2-hydroxyethylsulfanyl)-1,2-benzenediol (II), 2-(2,5-dihydroxyphenylsulfanyl)acetic acid (III), 2-(2,5-dihydroxy-3,4,6-trimethylphenylsulfanyl)acetic acid (IV), 2-[4,6-di(tert-butyl)-2,3-dihydroxyphenylsulfanyl]acetic acid (V), 5,7-di(tert-butyl)-8-hydroxy-2,3-dihydro-1,4-benzoxathiin-2-one (VI), 3-[4,6-di(tert-butyl)-2,3-dihydroxyphenylsulfanyl]-2-methyl-carboxyamidopropanoic acid (VII) was studied. A competition of redox process and complexation is possible when these organic compounds interact with silver(I) ions. I–IV, VI and VII were found to reduce Ag(I) to Ag(0), silver sol formation being possible under certain conditions. The sols were examined by TEM and optical spectroscopy methods. The interaction of V with silver(I) ions is not accompanied by a redox reaction, the latter being hindered by complexation. The complexation was studied by potentiometric titration, and the complex of V with Ag(I) was characterized by the means of X-ray powder diffraction, elemental analysis, TG/DTA and IR spectroscopy. The antimicrobial activities of V and its Ag(I) complex, evaluated by minimum inhibitory concentration (MIC), were also tested. |
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