This article was accepted into the corpus but its outbound wikilinks were never NER-processed — typical at the deepest BFS hop or when the run's entity cap was reached. No expansion funnel to show.
| C-58 | |
|---|---|
| Name | C-58 |
| Othernames | C58, Carbon_58 |
| Formula | C58 |
| Molar mass | 696.78 g·mol−1 |
| Appearance | dark allotrope / fullerene-like |
| Density | variable |
| State | solid |
C-58 is an allotrope of carbon consisting of 58 carbon atoms arranged in closed-cage or graphene-derived structures. It occupies a niche among fullerene, graphene, and carbon-cluster research, and has been investigated in contexts related to Buckminsterfullerene, graphene, carbon nanotube chemistry, and mass spectrometry studies of cluster stability. Experimental and theoretical work on C-58 links to developments in nanotechnology, materials science, and physical chemistry.
Nomenclature for the species follows conventions used for Buckminsterfullerene and other molecular clusters such as C60, C70, and C84. The label combines the element symbol used in IUPAC recommendations and the atom count, analogous to designations for C60 in the context of fullerene research and to cluster notation in physical chemistry literature. In spectroscopic and mass spectrometry reports, identifiers from repositories maintained by institutions like National Institute of Standards and Technology and databases used by International Union of Pure and Applied Chemistry are sometimes cited when discussing mass peaks attributed to C-58 species. Comparative naming appears alongside terms used in studies of bow-tie or non-IPR (isolated pentagon rule) fullerenes, and in computational work referencing density functional theory and Hartree–Fock calculations.
Physical descriptions draw parallels with other carbon clusters such as C60 and C70. C-58 structures have been modeled as closed-cage fullerenes, open-cage fragments, or as defects in graphene sheets and nanotube caps. Electronic properties often reference studies that compare HOMO–LUMO gaps against those reported for Buckminsterfullerene and graphene, and magnetic or spin states are discussed in relation to paramagnetic observations in electron paramagnetic resonance and magnetic resonance imaging-relevant spectroscopy. Optical absorption bands and photoluminescence have been interpreted using methods developed for ultraviolet–visible spectroscopy and Raman spectroscopy applied in investigations of C60 derivatives and polycyclic aromatic hydrocarbon systems. The thermodynamic stability of C-58 is generally lower than that of C60, and its reactivity resembles that of smaller fullerenes and defective graphene fragments, often discussed alongside reaction mechanisms from organic chemistry and surface science.
Reported generation methods include techniques adapted from fullerene and carbon-cluster production: arc-discharge methods developed after Kroto–Smalley–Curl experiments, laser ablation approaches used in cluster beam experiments, and chemical vapor deposition variants applied in nanotube and graphene fabrication. Isolation has relied on chromatographic separation methods analogous to those used for C60 and C70, including high-performance liquid chromatography protocols refined in studies at institutions such as Rice University and Max Planck Institute groups. Mass-selected cluster beams and matrix isolation in inert hosts (as employed in matrix isolation spectroscopy at facilities like Lawrence Berkeley National Laboratory) have enabled spectroscopic characterization. Chemical derivatization, using strategies inspired by Diels–Alder additions and nucleophilic additions explored in fullerene functionalization literature, assists solubilization and chromatographic handling, in work paralleling research from University of Oxford and Columbia University laboratories.
Potential applications are inferred from analogies with C60-based technologies and from unique electronic or surface properties predicted for non-icosahedral carbon clusters. Investigated areas include components in organic photovoltaic research, roles in molecular electronics and single-molecule device concepts developed in nanotechnology programs, and use as reactive intermediates in synthetic methodologies influenced by fullerene chemistry in synthetic organic chemistry departments. Proposed materials science applications draw on work in catalysis using carbon nanostructures, electrochemical energy storage advances inspired by lithium-ion battery research, and sensor technologies derived from surface-enhanced Raman scattering platforms examined at laboratories such as Massachusetts Institute of Technology and ETH Zurich.
Safety guidance for carbon clusters references protocols established for nanomaterial handling by regulatory and research organizations, including procedures advocated by Occupational Safety and Health Administration, European Chemicals Agency, and university environmental health and safety offices. Standard precautions include engineering controls such as localized ventilation and glovebox or inert atmosphere techniques used in fullerene laboratories at institutions like University of Cambridge; personal protective equipment consistent with nanomaterial recommendations; and methods for spill management and waste disposal modeled on protocols from National Institutes of Health and national research reactors. Toxicological profiles remain incomplete; studies paralleling nanotoxicology research on carbon nanotube and graphene materials are often cited in risk assessments.
Regulatory status is shaped by broader frameworks for carbon nanomaterials overseen by agencies like European Chemicals Agency, US Environmental Protection Agency, and Health Canada. Classification often follows nanoscale material guidance and chemical inventory listings analogous to entries for Buckminsterfullerene in national chemical inventories. Standards-setting work by organizations such as International Organization for Standardization and technical committees at ASTM International inform measurement, nomenclature, and safety reporting used in C-58 research contexts.
Active research includes computational studies employing density functional theory and wavefunction methods, experimental spectroscopy in matrix isolation and mass-selected beam facilities, and materials integration experiments borrowing techniques from spintronics and optoelectronics research at institutions including Stanford University, University of California, Berkeley, and Riken. Recent focuses include exploration of non-IPR fullerene chemistry paralleling historic studies of C60 isomerization, potential endohedral doping inspired by endohedral fullerene work, and synthesis of functional derivatives following strategies developed by synthetic groups at ETH Zurich and University of Tokyo. Collaborative networks across condensed matter physics, chemistry, and materials science continue to map structure–property relationships and to evaluate technological prospects.