Open-Shell Graphene Fragments

Zeng, Wangdong; Wu, Jishan

doi:10.1016/j.chempr.2020.10.009

Cited by 154 publications

(90 citation statements)

References 174 publications

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“…Currently, stable organic radicals in the form of stable tetrabenzo-Chichibabin's hydrocarbons [83], materials based on long acenes [84,85], radical polymers [86], and synthetic metals [87] occupy an increasing part of the agenda of modern chemistry. Graphene fragments were not left aside as well, as can be judged by a series of in-depth reviews of the case [88][89][90][91][92][93][94]. However, it is difficult to imagine that the huge amount of sp 2 amorphous carbons, both natural and engineered, as well as their exclusively broad involvement in various chemical and technical processes for more than a thousand years could not disregard such an important characteristic of the substance if it existed.…”

Section: Post-reaction Storage Of the Spin Chemistry Productsmentioning

confidence: 99%

sp2 Carbon Stable Radicals

Sheka

2021

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sp2 Nanocarbons such as fullerenes, carbon nanotubes, and graphene molecules are not only open-shell species, but spatially extended, due to which their chemistry is quite specific. Cogently revealed dependence of the final products composition on size and shape of the carbons in use as well as on the chemical prehistory is accumulated in a particular property—the stabilization of the species’ radical efficiency, thus providing the matter of stable radicals. If the feature is highly restricted and rarely available in ordinary chemistry, in the case of sp2 nanocarbons it is just an ordinary event providing, say, tons-in-mass stable radicals when either producing such widely used technological products as carbon black or dealing with deposits of natural sp2 carbons such as anthracite, shungite carbon, and other. Suggested in the paper is the consideration of stable radicals of sp2 nanocarbons from the standpoint of spin-delocalized topochemistry. Characterized in terms of the total and atomically partitioned number of effectively unpaired electrons as well as of the distribution of the latter over carbon atoms and described by selectively determined barriers of different reactions exhibiting topological essence of intermolecular interaction, sp2 nanocarbons reveal a peculiar topokinetics that lays the foundation of the stability of their radical properties.

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Section: Post-reaction Storage Of the Spin Chemistry Productsmentioning

confidence: 99%

sp2 Carbon Stable Radicals

Sheka

2021

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“…This is a typical phenomenon for many open-shell singlet diradicaloids, in which the NMR broadening is due to the existence of thermally populated triplet species. 15 At 193 K, all sharp peaks appeared, and the protons were assigned to the desired structure according to DFT calculations and with the assistance of the 2D ROESY spectrum at low temperature (Table S4 and Fig. S13 in the ESI † ).…”

Section: Resultsmentioning

confidence: 99%

A cyclopenta-fused dibenzo[b,d]thiophene-co-phenanthrene macrocyclic tetraradicaloid

Han

et al. 2021

Chem. Sci.

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“…[26,46] Specifically, GQDs typically feature two types of edge configurations, namely, armchair and zigzag edges (Figure 1). GQDs with only armchair edges mostly have nonmagnetic properties with relatively large energy gaps, while the introduction of zigzag edges can lead to smaller energy gaps with intriguing optical features and even to an open-shell character, [47][48][49][50] as demonstrated, for example, by the syntheses of anthenes [51,52] and periacenes. [53][54][55][56][57] Therefore, GQDs with armchair edges hold promise for application in photovoltaics [58,59] and logics, while those with zigzag edges are potential materials for spintronics and photonics.…”

Section: Introductionmentioning

confidence: 99%

Large Polycyclic Aromatic Hydrocarbons as Graphene Quantum Dots: from Synthesis to Spectroscopy and Photonics

Paternò

Goudappagouda

Chen

et al. 2021

Advanced Optical Materials

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The well-known advantages of OSCs over their inorganic counterparts lie essentially in their relatively high absorption coefficient (α ≈ 10 5 cm −1 ) and photoluminescence (PL) quantum yield, as well as their high solution processability, which reduces device fabrication costs. [4][5][6] All these properties could be further tuned and optimized by rational structure design and chemical synthesis, which have permitted extensive utilization of OSCs as active materials in organic solar cells [7][8][9] and light-emitting diodes (LEDs), [10][11][12] as well as efficient optical gain media in organic lasers. [13][14][15] Large polycyclic aromatic hydrocarbons (PAHs) have emerged in recent decades as unique OSCs with promising optical properties and high chemical and photostability. [16][17][18][19][20][21] These large PAHs, having discrete quasi-zero-dimensional graphene structures, can also be regarded as graphene quantum dots (GQDs). [22][23][24][25][26][27] In contrast to zero-bandgap graphene, the quantum confinement of the wave function in GQDs permits the opening of a finite energy gap, conferring appealing features that can be exploited in optoelectronics and photonics, such as a relatively large Frenkel exciton binding energy [28] and multicolor fluorescence. [29][30][31][32] In the fields of Materials Sciences, GQDs are

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Open-Shell Graphene Fragments

Cited by 154 publications

References 174 publications

sp2 Carbon Stable Radicals

sp2 Carbon Stable Radicals

A cyclopenta-fused dibenzo[b,d]thiophene-co-phenanthrene macrocyclic tetraradicaloid

Large Polycyclic Aromatic Hydrocarbons as Graphene Quantum Dots: from Synthesis to Spectroscopy and Photonics

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