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Chlorophyll and magnesium

Bioinorganic Chemistry (Intro) · Chemistry

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Why are plants green? Connect to chlorophyll's absorption. Step 1: Chlorophyll a absorbs strongly at ~430 nm (blue) and ~660 nm (red). Step 2: Green light (~550 nm) is absorbed weakly → mostly reflected/transmitted. Step 3: Our eyes see the reflected green. Step 4: The absorbed red/blue photons drive photosynthesis — green is the leftover!

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