Formation of ‘carbyne’ in the interaction of polyacetylene with potassium under high quasi-hydrostatic pressure

Carbyne polysulfide as a novel cathode material for lithium/sulfur batteries

“…Carbyne is an sp hybrid allotrope of carbon, in the form of cumulene and polyyne, having much higher reactivity because it has plenty of p electrons as compared with sp 2 and sp 3 hybrid allotropic carbon materials. [28][29][30][31][32] When co-heating it with sulfur, the C]C double bonds and C^C triple bonds rupture and the small sulfur molecules S m (1 # m # 4) chemically link to the carbon, thus forming carbyne polysulde. However, the pure carbyne can only be prepared and exist in extremely demanding environmental conditions, so only carbon material with cumulene and polyyne fragments named carbyne analogue, which can be prepared simply, has been previously applied.…”

Electrochemical Carbon

“…(Reductive splitting of C-H bonds to C + Hoccurs only under drastic conditions: polyacetylene is carbonized with potassium at 800 °C and 20-40 kbar. 250 ) PVDF is also completely inert against direct electrolysis at a carbon cathode. 33,239 Copolymers of tetrafluoroethylene and vinyl fluoride show behavior intermediate between that of PTFE and PVDF.…”

“…45 Figure 7 displays a comparison of the Raman spectra of C-NaF (polycrystalline) with those of the common carbon allotropes (single crystals). Carbons made by dehydrohalogenation of poly-(vinylidene halides), 33,239,[250][251][252][253][254]311,312 poly(trichloro-butadiene), 257 chlorinated polyacetylene, 263 and poly-(vinyl chloride) 266 also show the IR 33,239,[250][251][252][253][254]257,263,312 and Raman 252,263,266,311 active CtC stretch. A weak (uninterpreted) band at ∼2200 cm -1 appears in SERS of ethylenediamine-derived carbon.…”

Dynamic Pressure Synthesis of Carbynes

“…It is also established that the fullerenes are built from a mix of Sp2 _Sp3 carbon atoms. The formation of carbyne has been confirmed in studies on intercalation of metals into polyacetylene under quasi-hydrostatic pressure of 20-40 kbar [29], and in experiments on intercalation of carbyne prepared by chemical dehydrochlorination of poly(vinylidene chloride) (PVOC) powder mixed with potassium hydroxide in ethanol and THF [30] using a procedure reported in [31]. Adapting the kinked-chain model [32] to the results of the analysis conducted on the products of intercalation, a structure of linear carbon chains with intercalated Na atoms (CIC-Na) was proposed to explain the observed diffraction pattern shown in Table VI.…”

“…Combining the kink-chain model [32] with the possible presence of intercalated metal atoms [29,30] and the presence of Sp_Sp2 atoms in such a structure, an "intuitive" unit cell of a carbyne material was proposed recently (see Chapter 6.4.). …”