Experimental study demonstrates high-pressure synthesis of uniform carbon nanothreads from fluorinated precursors, highlighting a pathway toward atom-level ordered one-dimensional nanomaterials.
-bonded one-dimensional nanomaterial that was predicted to combine the extreme strength with excellent flexibility. However, the reported CNTh usually has a nonuniform intrathread structure, and the synthesis of structure-specific CNTh is still a big challenge. Here, we selected 1,2,3-trifluorobenzene (1,2,3-TFB) with strong dipole as a precursor. By compressing 1,2,3-TFB to 20.1 GPa, a CNTh with a "zipper polymer" structure is obtained. Under applied pressure, 1,2,3-TFB are anti-parallelly stacked in column, and polymerize via selective sequential [4 + 2] polymerization between H-carbon dienophile/F-carbon dienophile and F, H-carbon diene within the column, followed by the "zippered" bonding of the rest atoms. The obtained CNTh is highly hydrophobic with contact angle of 124.6°. The excellent columnar anti-parallel π···π stacking and distinct reactivities of carbon atoms introduced by the F-substitution are responsible for the high reaction selectivity, which provides new insight for the precise synthesis of atom-level ordered CNThs.
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Che et al. (2025) studied this question.
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