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The molar absorptivities of the three peaks in the UV-Vis spectrum of na3[v(cn)6] are of the order of 7 l mol-1 cm-1. Are these intensities expected? briefly justify your answer.
Accepted Answer
The molar absorptivities of 7 L mol-1 cm-1 for the UV-Vis spectrum of Na3[V(CN)6] are unexpectedly low. Typical molar absorptivities for strong chromophores in the UV-Vis range are significantly higher, often in the range of 10^3 to 10^5 L mol-1 cm-1. The low molar absorptivities suggest that the electronic transitions responsible for these peaks are weak, likely due to forbidden transitions or the involvement of d-d transitions within the vanadium(III) ion, which are typically weak due to Laporte selection rules.
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