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Anomalous Optoelectronic Properties of Chiral Carbon Nanorings…and One Ring to Rule Them All^23.

ABSTRACT: Carbon nanorings are hoop-shaped, ?-conjugated macrocycles that form the fundamental annular segments of single-walled carbon nanotubes (SWNTs). In a very recent report, the structures of chiral carbon nanorings (which may serve as chemical templates for synthesizing chiral nanotubes) were experimentally synthesized and characterized for the first time. Here in our Letter we show that the excited-state properties of these unique chiral nanorings exhibit anomalous and extremely interesting optoelectronic properties with excitation energies growing larger as a function of size (in contradiction with typical quantum confinement effects). Although the first electronic excitation in armchair nanorings is forbidden with a weak oscillator strength, we find that the same excitation in chiral nanorings is allowed because of a strong geometric symmetry breaking. Most importantly, among all the possible nanorings synthesized in this fashion, we show that only one ring, corresponding to a SWNT with chiral indices (n+3,n+1), is extremely special with large photoinduced transitions that are most readily observable in spectroscopic experiments.

SUBMITTER: Wong BM

PROVIDER: S-EPMC4047598 | biostudies-literature | 2011 Nov

REPOSITORIES: biostudies-literature

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Anomalous Optoelectronic Properties of Chiral Carbon Nanorings…and One Ring to Rule Them All<sup>23.</sup>

Wong Bryan M BM Lee Jonathan W JW

The journal of physical chemistry letters 20111012 21

Carbon nanorings are hoop-shaped, π-conjugated macrocycles that form the fundamental annular segments of single-walled carbon nanotubes (SWNTs). In a very recent report, the structures of chiral carbon nanorings (which may serve as chemical templates for synthesizing chiral nanotubes) were experimentally synthesized and characterized for the first time. Here in our Letter we show that the <i>excited-state</i> properties of these unique chiral nanorings exhibit anomalous and extremely interesting ...[more]

PMID: 24920994

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Project description:Plant mitochondrial genomes are usually assembled and displayed as circular maps based on the widely-held view across the broad community of life scientists that circular genome-sized molecules are the primary form of plant mitochondrial DNA, despite the understanding by plant mitochondrial researchers that this is an inaccurate and outdated concept. Many plant mitochondrial genomes have one or more pairs of large repeats that can act as sites for inter- or intramolecular recombination, leading to multiple alternative arrangements (isoforms). Most mitochondrial genomes have been assembled using methods unable to capture the complete spectrum of isoforms within a species, leading to an incomplete inference of their structure and recombinational activity. To document and investigate underlying reasons for structural diversity in plant mitochondrial DNA, we used long-read (PacBio) and short-read (Illumina) sequencing data to assemble and compare mitochondrial genomes of domesticated (Lactuca sativa) and wild (L. saligna and L. serriola) lettuce species. We characterized a comprehensive, complex set of isoforms within each species and compared genome structures between species. Physical analysis of L. sativa mtDNA molecules by fluorescence microscopy revealed a variety of linear, branched, and circular structures. The mitochondrial genomes for L. sativa and L. serriola were identical in sequence and arrangement and differed substantially from L. saligna, indicating that the mitochondrial genome structure did not change during domestication. From the isoforms in our data, we infer that recombination occurs at repeats of all sizes at variable frequencies. The differences in genome structure between L. saligna and the two other Lactuca species can be largely explained by rare recombination events that rearranged the structure. Our data demonstrate that representations of plant mitochondrial genomes as simple, circular molecules are not accurate descriptions of their true nature and that in reality plant mitochondrial DNA is a complex, dynamic mixture of forms.

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Anomalous Optoelectronic Properties of Chiral Carbon Nanorings…and One Ring to Rule Them All^23.

Publications

Anomalous Optoelectronic Properties of Chiral Carbon Nanorings…and One Ring to Rule Them All<sup>23.</sup>

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Dataset Information

Anomalous Optoelectronic Properties of Chiral Carbon Nanorings…and One Ring to Rule Them All23.

Publications

Anomalous Optoelectronic Properties of Chiral Carbon Nanorings…and One Ring to Rule Them All<sup>23.</sup>

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

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Anomalous Optoelectronic Properties of Chiral Carbon Nanorings…and One Ring to Rule Them All^23.