- From Linear Molecular Chains to Extended Polycyclic Networks: Polymerization of Dicyanoacetylene
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Dicyanoacetylene (C4N2) is an unusual energetic molecule with alternating triple and single bonds (think miniature, nitrogen-capped carbyne), which represents an interesting starting point for the transformation into extended carbon-nitrogen solids. While pressure-induced polymerization has been documented for a wide variety of related molecular solids, precise mechanistic details of reaction pathways are often poorly understood and the characterization of recovered products is typically incomplete. Here, we study the high-pressure behavior of C4N2 and demonstrate polymerization into a disordered carbon-nitrogen network that is recoverable to ambient conditions. The reaction proceeds via activation of linear molecules into buckled molecular chains, which spontaneously assemble into a polycyclic network that lacks long-range order. The recovered product was characterized using a variety of optical spectroscopies, X-ray methods, and theoretical simulations and is described as a predominately sp2 network comprising "pyrrolic" and "pyridinic" rings with an overall tendency toward a two-dimensional structure. This understanding offers valuable mechanistic insights into design guidelines for next-generation carbon nitride materials with unique structures and compositions.
- Gou, Huiyang,Zhu, Li,Huang, Haw-Tyng,Biswas, Arani,Keefer, Derek W.,Chaloux, Brian L.,Prescher, Clemens,Yang, Liuxiang,Kim, Duck Young,Ward, Matthew D.,Lerach, Jordan,Wang, Shengnan,Oganov, Artem R.,Epshteyn, Albert,Badding, John V.,Strobel, Timothy A.
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p. 6706 - 6718
(2017/08/29)
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- Gas infrared spectra, assignments, and absolute IR band intensities of C4N2 in the 250-3500 cm-1 region: Implications for Titan's stratosphere
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The IR spectrum of gaseous dicyanoacetylene, NC-C≡CC-CN, is studied in the 3500-220 cm-1 range, employing Fourier transform spectroscopy. A total of 17 bands are analyzed and assigned. The absolute intensity is determined and the associated uncertainty is estimated for each of the bands. The resulting data are used to study the detectability of gaseous C4N2 in Titan's atmosphere. In particular a better estimate of the upper limits of its abundance in Titan's atmosphere is obtained when our results are used to reanalyse Voyager IRIS infrared spectra.
- Khlifi,Paillous,Bruston,Guillemin,Benilan,Daoudi,Raulin
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p. 707 - 712
(2007/10/03)
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- The infrared and Raman spectrum of dicyanoacetylene. The ν9 fundamental
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The Raman spectrum of liquid dicyanoacetylene, NC-CC-CN, was reinvestigated and ν3 found at 617 cm-1.The Fermi resonance between ν1 and 2ν5 is explained, considering the isotopic species NC-13CC-CN.The high resolution infrared spectrum of the lowest frequency fundamental ν9 has been recorded for the first time, and the rotational constants for several states with v9 /= 9 have been determied.
- Winther, F.,Ketelsen, M.,Guarnieri, A.
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- Organic Heterocyclothiazenes. Part 5. Cycloaddition Reactions of Tetrasulphur Tetranitride with Highly Electron Deficient Alkynes
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In contrast with previous, complex, S4N4-alkyne reactions, treatment of butynedinitrile and S4N4 is found to give 1,3,5,2,4-trithiadiazepine-6,7-dicarbonitrile (8) and 1,2,5-thiadiazole-3,4-dicarbonitrile (9) very cleanly and in high yield.Hexafluorobut-2
- Dunn, Peter J.,Rees, Charles W.
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p. 1579 - 1584
(2007/10/02)
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