首页|On-surface synthesis and characterization of polyynic carbon chains
On-surface synthesis and characterization of polyynic carbon chains
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Carbyne,an elusive sp-hybridized linear carbon allotrope,has fascinated chemists and physicists for decades.Due to its high chemical reactivity and extreme instability,carbyne was much less explored in contrast to the sp2-hybridized carbon allotropes such as graphene.Herein,we report the on-surface synthesis of polyynic carbon chains by demetallization of organometallic polyynes on the Au(lll)surface;the longest one observed consists of～60 alkyne units(120 carbon atoms).The polyynic structure of carbon chains with alternating triple and single bonds was unambiguously revealed by bond-resolved atomic force microscopy.Moreover,an atomically precise polyyne,C14,was successfully produced via tip-induced dehalogenation and ring-opening of the decachloroanthracene molecule(C14Cl10)on a bilayer NaCl/Au(lll)surface at 4.7 K,and a band gap of 5.8 eV was measured by scanning tunnelling spectroscopy,in a good agreement with the theoretical HOMO-LUMO gap(5.48 eV).
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