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Atomic and Condensed Matter
Colorless Compounds and electromagnetic radiation
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[QUOTE="pisluca99, post: 6882997, member: 730550"] I was trying to understand why some compounds appear colorless (transparent) and tried to give an explanation. I take benzene as an example: it is a chromophore group in which there is π-conjugation, so a certain energy gap is generated between HOMO and LUMO. This energy gap is such that in order for an electronic transition to take place, the molecule goes to forcibly absorb electromagnetic radiation that falls into the UV. As a result, the molecule will go on to reflect other electromagnetic radiation, again from the UV, which does not allow the same electronic transition to take place. This reflected radiation reaches our eye, but we are unable to perceive it. Contextually, the molecule is not able to interact with visible light, that is, it is neither absorbed nor reflected, so it is transmitted, which allows us to observe "through" the solvent. Can this be considered roughly correct reasoning? [/QUOTE]
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