Carbynes: Advances in the field of linear carbon chain compounds

Kudryavtsev, Yu. P.; Heimann, Robert B.; Evsyukov, S. E.

doi:10.1007/bf01160799

Cited by 97 publications

(37 citation statements)

References 114 publications

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“…2 Fibrous sp 1 -hybridized carbon has been identified in a mineral environment; 3 similar "carbynes" have been suggested to occur in interstellar dust, 4 and similar materials have been synthesized by shock compression of graphite. [5][6][7][8][9] A broad spectrum of "turbostratic graphites" are also known, in which individual graphene layers show rotational and tilt disorder relative to their neighbors. A recent extreme example is provided by cores of carbon spherules in the Murchison meteorite, which are aggregates of randomly oriented single layers with additional structure defects.…”

Section: Introductionmentioning

confidence: 99%

Unconventional magnetism in all-carbon nanofoam

et al. 2004

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We report production of nanostructured magnetic carbon foam by a high-repetition-rate, high-power laser ablation of glassy carbon in Ar atmosphere. A combination of characterization techniques revealed that the system contains both sp 2 and sp 3 bonded carbon atoms. The material is a form of carbon containing graphitelike sheets with hyperbolic curvature, as proposed for "schwarzite." The foam exhibits ferromagnetic-like behavior up to 90 K, with a narrow hysteresis curve and a high saturation magnetization. Such magnetic properties are very unusual for a carbon allotrope. Detailed analysis excludes impurities as the origin of the magnetic signal. We postulate that localized unpaired spins occur because of topological and bonding defects associated with the sheet curvature, and that these spins are stabilized due to the steric protection offered by the convoluted sheets.

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Section: Introductionmentioning

confidence: 99%

Unconventional magnetism in all-carbon nanofoam

et al. 2004

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“…1). Carbyne is the most elusive of the basic carbon allotropes, and its existence, structure, and properties have been a controversial topic for decades [16][17][18][19][20][21]. One of the most interesting questions surrounding carbyne has been the nature of its bonding: does it resemble a cumulene or a polyyne?…”

Section: Introductionmentioning

confidence: 99%

Oligomers from sp-Hybridized Carbon: Cumulenes and Polyynes

Frankenberger

Januszewski

Tykwinski

2013

Fullerenes and Other Carbon-Rich Nanostructures

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Carbon-rich organic compounds are candidates for use in a wide range of new technologies. Particularly interesting are materials with a framework of pure carbon, namely the allotropes. Much is known about the most common allotropes, diamond (sp 3 -carbon) and graphite (sp 2 -carbon), as well as the newer allotropes, fullerenes, nanotubes, and graphene. On the other hand, little is known about the allotrope constructed from sp-hybridized carbon atoms, a material commonly called carbyne. Without a defined sample of carbyne to study, synthetic chemists have attempted to model the properties of carbyne through the formation of defined length oligomers based on a cumulene or polyyne skeleton. Spectroscopic analysis of these series of oligomers by vibrational (IR and Raman), NMR, and UV/Vis spectroscopy has outlined some of the potential properties of carbyne. Likewise, X-ray crystallographic analyses give further clues as to the structure of carbyne. This review will highlight selected synthetic methods for cumulenes and polyynes, and it then summarizes characterization data related to structure and bonding in these molecules.

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“…Since then, intensive researches have been performed on its preparation [8][9][10], spectroscopy [11,12] and calculation [13]. Some reviews [14][15][16][17] outlined the advancement on the subject. Although the linear structure of sp-bonded carbon allotrope is fascinating and attractive, and the allotrope was synthesized as early as in 1960s, the properties and applications of the linear carbon are not well revealed due to difficulties of its instability and massive preparation.…”

Section: Introductionmentioning

confidence: 99%