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4$\begingroup$ As you can see here, wavelengths of the maximum absorption says nothing about the shape and width of very broad absorption bands, typical for condensed phases. Thin absorption lines are seen (almost(?)) exclusively for atomic absorption spectra in gaseous phase only. $\endgroup$– PoutnikCommented Sep 23, 2023 at 7:44
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2$\begingroup$ When we see the colour, the way we perceive it is very complicated, it depends somehow on how much is absorbed vs reflected at many wavelengths. But, in practise to characterise molecules we use a spectrophotometer and measure exactly what the absorption is vs. wavelength. This enables us to work out where the energy levels in the molecule are. $\endgroup$– porphyrinCommented Sep 23, 2023 at 14:25
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$\begingroup$ @porphyrin oh okay , then we can say titanium complex is having stronger reflection of violet light and strong absorption of blue green and , for the cobalt complex strong absorption of blue green and stronger reflection of red ? $\endgroup$– RazzCommented Sep 24, 2023 at 2:08
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$\begingroup$ @Poutnik thank you , it seems the materials absorb a range of wavelengths which makes them recieve their characteristic colour $\endgroup$– RazzCommented Sep 24, 2023 at 2:09
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$\begingroup$ As I mentioned the way we perceive is complex, a solid of the same substance may appear quiet different to its dilute solution hence the use of instruments to characterise. I have seen a 'color wheel' that helps one to understand absorption/reflection and what you actually see, you could search or possibly someone else has a reference. $\endgroup$– porphyrinCommented Sep 24, 2023 at 7:29
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