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Fullerene

A fullerene is an allotrope of carbon whose molecule consists of carbon atoms connected by single and double bonds so as to form a closed or partially closed mesh, with fused rings of five to seven atoms. The molecule may be a hollow sphere, ellipsoid, tube, or many other shapes and sizes. Graphene (isolated atomic layers of graphite), which is a flat mesh of regular hexagonal rings, can be seen as an extreme member of the family. Fullerenes with a closed mesh topology are informally denoted by their empirical formula Cn, often written Cn, where n is the number of carbon atoms. However, for some values of n there maybe more than one isomer. The family is named after buckminsterfullerene (C60), the most famous member, which in turn is named after Buckminster Fuller. The closed fullerenes, especially C60, are also informally called buckyballs for their obvious resemblance to the standard ball of association football ('soccer'). Nested closed fullerenes have been named bucky onions. Cylindrical fullerenes are also called carbon nanotubes or buckytubes. The bulk solid form of pure or mixed fullerenes is called fullerite. Fullerenes had been predicted for some time, but only after their accidental synthesis in 1985 were they detected in nature and outer space. The discovery of fullerenes greatly expanded the number of known allotropes of carbon, which had previously been limited to graphite, diamond, and amorphous carbon such as soot and charcoal. They have been the subject of intense research, both for their chemistry and for their technological applications, especially in materials science, electronics, and nanotechnology. The icosahedral C60H60 cage was mentioned in 1965 as a possible topological structure. Eiji Osawa currently of Toyohashi University of Technology predicted the existence of C60 in 1970. He noticed that the structure of a corannulene molecule was a subset of the shape of a soccer ball, and hypothesised that a full ball shape could also exist. Japanese scientific journals reported his idea, but neither it nor any translations of it reached Europe or the Americas. Also in 1970, R. W. Henson (then of the UK Atomic Energy Research Establishment) proposed the C60 structure and made a model of it. Unfortunately, the evidence for that new form of carbon was very weak at the time, so the proposal was met with skepticism, and was never published. It was acknowledged only in 1999. In 1973, independently from Henson, a group of scientists from the USSR made a quantum-chemical analysis of the stability of C60 and calculated its electronic structure. The paper was published in 1973, but the scientific community did not give much importance to this theoretical prediction. Around 1980, Sumio Iijima identified the molecule of C60 from an electron microscope image of carbon black, where it formed the core of a particle with the structure of a 'bucky onion'.

[ "Quantum mechanics", "Nanotechnology", "Organic chemistry", "Inorganic chemistry", "Fullerene C70", "C60 fullerene", "C70 fullerene", "Buckminsterfullerene", "Sumanene" ]
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