Complex with fullerenol and copper (II)

Abstract

Polyhydroxy fulleren derivates have significant potential in nanomedical application. Research of polyanion nanoparticle fullerenol C60(OH)24 is of high significance for interpretation of biological mechanisms. This paper investigated the properties of polyanion nanoparticle fullerenol C60(OH)24 as a potential polydentat ligand. Fullerenol C60(OH)24 water solutions were added in solution of [Cu(NH3)4]2+ in order to form a dark brown complex. Absorbance of [Cu(NH3)4]2+ solution was decreasing with increasing concentration of polyanion nanoparticle nanoligand fullerenol. This relation was determined in all investigated concentrations of [Cu(NH3)4]2+. The ratio of Cu2+ complex composer to polyanion polydentat nanoligand fullerenol had an increase from 1.5 to 9, proportional to the increase of the complex composer concentration and decrease of polyanion polydentat nanoligand fullerenol in the alkali medium. The thermogram TGA-DTA of fullerenol and fullerenol and CuSO4 complex, clearly show endothermic effects (which are the result of dehydratation and dehydroxylation) and exothermic effects (as the result of degradation of C60(OH)24 molecules and processes of oxidation in CO, CO2. At the beginning of TGA-DTA fullerenol thermogram, there is a very well defined endothermic peak of water loss at 100°C, followed by mass decrease as a consequence of lost hydroxyl groups, covalent bounded for C60. The influence of the complex composer is manifested in the moving of thermal stability towards lower temperatures. The complex composer is a catalyst of the process of polyanion polydentat nanoligand fullerenol oxidation to CO and CO2. The temperature peak of fullerenol oxidation is at 490°C and in the case of complex oxidation two peaks were detected at 380 and 410°C.

Keywords

• polydentat
• polyanion
• nanoligand
• fullerenol
• complex
• Cu2+