Single-molecule-like carbon nanocapsules derived from I2-filled ultrashort single-walled carbon nanotubes (US-tubes) have been prepared and characterized as a new paradigm in X-ray contrast-agent design. Functionalized by Bingel chemistry with external malonodiserinolamide (Ser) groups, the new I2@US-tube (Ser)n species are water-soluble (0.25 mg mL–1) and more than twice as X-ray opaque as their empty US-tube(Ser) precursors.
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