Laboratory experiment demonstrates isomerization of Co(III) complexes using sunlight, indicating practical applications for students.
In this experiment, the easy isomerization from the nitro complex [Co(NO2)(NH3)5]Cl2 to the nitrito isomer [Co(ONO)(NH3)5]Cl2, by exposure to sunlight is reported. The process is also monitored by the changes in the infrared spectra that are associated with the rearrangement of the ligand from the nitro- to the nitrito-isomer. The infrared spectra were supplemented by visible spectra, comparing the solution spectra of pure, freshly-prepared isomer and those of samples irradiated for several periods of time. This is a very useful tool as it allows students to relate color changes to the isomerization of the complex.
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Criado et al. (2011) studied this question.
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