Abstract
Abstract The continuous photolysis in aqueous solution of pentacyanoferrate(II) complexes with bidentate diamine ligands, , where is 1,2-diaminoethane (en) or 1,3-diaminopropane (tn) was investigated with emphasis on the effect of the excitation energy and the solvent properties. The quantum yields obtained for the ring closure process were found to be strongly dependent on the excitation wavelength, ranging from 0.022 to 0.236. The quantum yield variation over the spectral region of irradiation exhibited a systematic trend towards higher values for shorter wavelengths, indicating that cyanide photosubstitution takes place from more than one channel. In glycerol-water solutions, the quantum yields for the photoprocess decreased with the increased with the increase in glycerol concentration. The magnitudes of the quantum yields showed a good correlation with the physical properties of the mixed solvents, such as viscosity and dielectric constant. The results showed the presence of an efficient cage effect and that the influence of physical parameters, such as medium properties, can interfere in the quantum yield values of a determined process.
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