Study of Iron (III) and Cobalt (II) Acetylacetonatesin Organic Solvent Using Fluorescence and UV-Vis Spectrometry Method

In this research, a spectrofluorimetric method has been used for studying complexes of Co(acac)2 and Fe(acac)3 in various organic solvents and different conditions.The qualitative method was based on measuring the decrease in fluorescence intensity of pure organic solvents such as dichloromethane, toluene and carbon tetrachloride after addition of acetylacetonates of iron (III) and cobalt (II). The intensity of the fluorescence emission peak was measured at a different excitation wavelength and several solutions at a concentration range of 103-1010 mol/L of Co(acac)2 and Fe(acac)3. The spectrums from solutions in toluene in the region 306 nm and 440 nm with excitation wavelength 250 nm were found to be more suitable than the other spectrums. The range of concentration and type of complex caused different quenching effects on peak intensity of solvent. Absorption spectrums showed an increase in intensity with an increase in the concentration of complexes in solvents. The effect of different parameters such as the time length of solutions stability and solutions environment were studied. Consequently, with respect to complexes quenching effects on the fluorescence intensity of solvents in different condition, it is possible to use this effect for quantitative determination of both complexes in real samples.