The broad peak observed in UV spectroscopy for Mn complexes is often attributed to ligand-to-metal charge transfer (LMCT) transitions. In these transitions, an electron is excited from a ligand orbital to a higher-energy metal orbital. The broadness of the peak arises due to various factors. One reason is the presence of multiple ligand orbitals involved in the charge transfer process, resulting in a range of energy levels. Additionally, the transition may involve a combination of different metal and ligand orbitals, each with slightly different energies, leading to a broad distribution of states available for excitation. Furthermore, the broadening can be influenced by the presence of other ligands or solvent molecules that interact with the Mn complex, leading to variations in the local environment and energy levels. These interactions can cause additional shifts and broadening of the absorption peak. It is also worth noting that the broadness of the peak may be affected by instrumental factors such as the spectral resolution and the width of the incident light beam. These factors can contribute to the observed broadening of the peak in the UV spectroscopy of Mn complexes.
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In my opinion, it is better for you to familiarize yourself with the theory of UV spectroscopy and then read articles similar to your work topic so that you can have a better interpretation of the results. for example, you can see the following articles:
4. Ultraviolet/visible spectroscopy - The Royal Society of Chemistry
Absorption curves :The energies of the orbitals involved in electronic transitions have fixed values, and as energy is quantized, it would be expected that absorption peaks in ultraviolet/ visible spectroscopy should be sharp peaks. However this is rarely, if ever, actually observed. Instead, broad absorption peaks are seen. This is because a number of vibrational energy levels are available at each electronic energy level, and transitions can occur to and from the different vibrational levels (Fig. 6). This results in peak broadening.
Synthesis, characterization and antibacterial studies of Mn(II) and Co(II) complexes of an ionic liquid tagged Schiff base
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