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Cyclic tetraaryl[5]cumulenes (1 a–f) have been synthesized and studied as a function of increasing ring strain. The magnitude of ring strain is approximated by the extent of bending of the cumulenic core as assessed by a combination of X‐ray crystallographic analysis and DFT calculations. Trends are observed in 13C NMR, UV‐vis, and Raman spectra associated with ring strain, but the effects are small...
Solution‐processed, large‐area, and flexible electronics largely relies on the excellent electronic properties of sp2‐hybridized carbon molecules, either in the form of π‐conjugated small molecules and polymers or graphene and carbon nanotubes. Carbon with sp‐hybridization, the foundation of the elusive allotrope carbyne, offers vast opportunities for functionalized molecules in the form of linear...
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