What's a macroscopic chemical unit as a scale for alien communication?

Let's say we're composing a message intended for radio transmission to intelligent alien life. We'd like to talk about sizes and distances, so we'll need a unit of length. We're already planning to use units based on radio waves and astronomy, but for redundancy, our scientists would like to use something from chemistry as well.

Is there any measurable distance known to chemistry that is macroscopic in size (around 100 Âµm or bigger) that could be used as a unit of measure?

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What's a macroscopic chemical unit as a scale for alien communication?

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