Hi, I had tin4 iodide (which is bright orange colored) takenfor uv-vis spectra a

Question

Hi, I had tin4 iodide (which is bright orange colored) takenfor uv-vis spectra and I have a wavelength 364nm at 0.956 absorption. Orange color is known to have a much longer wavelength around600nm Could the absorption affect the wavelength? (Thinking that 2.0absorption is 100% and 0.0 is 0% of absorption) I need to explain why orange colored tin4 iodide had only364nm wavelength.. Thanks! Hi, I had tin4 iodide (which is bright orange colored) takenfor uv-vis spectra and I have a wavelength 364nm at 0.956 absorption. Orange color is known to have a much longer wavelength around600nm Could the absorption affect the wavelength? (Thinking that 2.0absorption is 100% and 0.0 is 0% of absorption) I need to explain why orange colored tin4 iodide had only364nm wavelength.. Thanks!

Explanation / Answer

An absorption spectra shows you the wavelengths of the spectrum that a compound absorbs.  Since tin iodide looks orange, tin iodide is reflecting orange light and is not absorbing it.  So, your spectra should show that tin iodide does not have a peak around 600 nm because tin iodide reflects that region of light.  The spectrum shows that tin iodide is absorbing light around 346 nm and not reflecting it which is why tin iodide does not look purple.

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