If you think gold, platinum or palladium is expensive, you might be shocked at the cost of endohedral fullerene. Selling the weight of ⅕ of a snowflake for $32,000, this material costs $160 million dollars per gram. At the time of writing this gold is priced at $35.33/gram.
Endohedral fullerenes were first discovered in 1985, these insanely expensive metals are spherical carbon nanostructures. This metal consists of fullerene cages of only 60 carbon atoms and trap simple molecules like nitrogen, phosphorus and helium. These nanostructures have the ability to change how we keep time due to an extra long electron spin lifetime when filled with nitrogen.
![Electron microscopy images of M3N@C80 peapods. Metal atoms (M = Ho or Sc) are seen as dark spots inside the fullerene molecules; they are doubly encapsulated in the C80 molecules and in the nanotubes.[1] Endohedral fullerenes, also called endofullerenes, are fullerenes that have additional atoms, ions, or clusters enclosed within their inner spheres. The first lanthanum C60 complex was synthesized in 1985 and called La@C60.[2] The @ (at sign) in the name reflects the notion of a small molecule trapped inside a shell. Two types of endohedral complexes exist: endohedral metallofullerenes and non-metal doped fullerenes. Contents [hide] 1Notation 2 Endohedral metallofullerenes 3 Non-metal doped fullerenes 4 Molecular endofullerenes 5 See also 6 References 7 External links Notation[edit] In a traditional chemical formula notation, a buckminsterfullerene (C60) with an atom (M) was simply represented as MC60 regardless of whether M was inside or outside the fullerene. In order to allow for more detailed discussions with minimal loss of information, a more explicit notation was proposed in 1991,[2] where the atoms listed to the left of the @ sign is situated inside the network composed of the atoms listed to the right. The example above would then be denoted M@C60 if M were inside the carbon network. A more complex example is K2(K@C59B), which denotes "a 60-atom fullerene cage with one boron atom substituted for a carbon in the geodesic network, a single potassium trapped inside, and two potassium atoms adhering to the outside."[2] The choice of the symbol has been explained by the authors as being concise, readily printed and transmitted electronically (the at sign is included in ASCII, which most modern character encoding schemes are based on), and the visual aspects suggesting the structure of an endohedral fullerene. Endohedral metallofullerenes[edit] Doping fullerenes with electropositive metals takes place in an arc reactor or via laser evaporation. The metals can be transition metals like scandium, yttrium as well as lanthanides like lanthanum and cerium. Also possible are endohedral complexes with elements of the alkaline earth metals like barium and strontium, alkali metals like potassium and tetravalent metals like uranium, zirconium and hafnium. The synthesis in the arc reactor is however unspecific. Besides unfilled fullerenes, endohedral metallofullerenes develop with different cage sizes like La@C60 or La@C82 and as different isomer cages. Aside from the dominant presence of mono-metal cages, numerous di-metal endohedral complexes and the tri-metal carbide fullerenes like Sc3C2@C80 were also isolated. In 1999 a discovery drew large attention. With the synthesis of the Sc3N@C80 by Harry Dorn and coworkers, the inclusion of a molecule fragment in a fullerene cage had succeeded for the first time. This compound can be prepared by arc-vaporization at temperatures up to 1100 °C of graphite rods packed with scandium(III) oxide iron nitride and graphite powder in a K-H generator in a nitrogen atmosphere at 300 Torr.[3] Endohedral metallofullerenes are characterised by the fact that electrons will transfer from the metal atom to the fullerene cage and that the metal atom takes a position off-center in the cage. The size of the charge transfer is not always simple to determine. In most cases it is between 2 and 3 charge units, in the case of the La2@C80 however it can be even about 6 electrons such as in Sc3N@C80 which is better described as [Sc3N]+6@[C80]−6. These anionic fullerene cages are very stable molecules and do not have the reactivity associated with ordinary empty fullerenes. They are stable in air up to very high temperatures (600 to 850 °C). The lack of reactivity in Diels-Alder reactions is utilised in a method to purify [C80]−6 compounds from a complex mixture of empty and partly filled fullerenes of different cage size.[3] In this method Merrifield resin is modified as a cyclopentadienyl resin and used as a solid phase against a mobile phase containing the complex mixture in a column chromatography operation. Only very stable fullerenes such as [Sc3N]+6@[C80]−6 pass through the column unreacted. In Ce2@C80 the two metal atoms exhibit a non-bonded interaction.[4] Since all the six-membered rings in C80-Ih are equal[4] the two encapsulated Ce atoms exhibit a three-dimensional random motion.[5] This is evidenced by the presence of only two signals in the 13C-NMR spectrum. It is possible to force the metal atoms to a standstill at the equator as shown by x-ray crystallography when the fullerene is exahedrally functionalized by an electron donation silyl group in a reaction of Ce2@C80 with 1,1,2,2-tetrakis(2,4,6-trimethylphenyl)-1,2-disilirane. Non-metal doped fullerenes[edit] Martin Saunders in 1993 produced endohedral complexes He@C60 and Ne@C60 by pressurizing C60 to ca. 3 bar in a noble-gas atmosphere.[6] Under these conditions about one out of every 650,000 C60 cages was doped with a helium atom. The formation of endohedral complexes with helium, neon, argon, krypton and xenon as well as numerous adducts of the He@C60 compound was also demonstrated[7] with pressures of 3 kbars and incorporation of up to 0.1% of the noble gases. While noble gases are chemically very inert and commonly exist as individual atoms, this is not the case for nitrogen and phosphorus and so the formation of the endohedral complexes N@C60, N@C70 and P@C60 is more surprising. The nitrogen atom is in its electronic initial state (4S3/2) and is therefore to be highly reactive. Nevertheless N@C60 is sufficiently stable that exohedral derivatization from the mono- to the hexa adduct of the malonic acid ethyl ester is possible. In these compounds no charge transfer[disambiguation needed] of the nitrogen atom in the center to the carbon atoms of the cage takes place. Therefore 13C-couplings, which are observed very easily with the endohedral metallofullerenes, could only be observed in the case of the N@C60 in a high resolution spectrum as shoulders of the central line. The central atom in these endohedral complexes is located in the center of the cage. While other atomic traps require complex equipment, e.g. laser cooling or magnetic traps, endohedral fullerenes represent an atomic trap that is stable at room temperature and for an arbitrarily long time. Atomic or ion traps are of great interest since particles are present free from (significant) interaction with their environment, allowing unique quantum mechanical phenomena to be explored. For example, the compression of the atomic wave function as a consequence of the packing in the cage could be observed with ENDOR spectroscopy. The nitrogen atom can be used as a probe, in order to detect the smallest changes of the electronic structure of its environment. Contrary to the metallo endohedral compounds, these complexes cannot be produced in an arc. Atoms are implanted in the fullerene starting material using gas discharge (nitrogen and phosphorus complexes) or by direct ion implantation. Alternatively, endohedral hydrogen fullerenes can be produced by opening and closing a fullerene by organic chemistry methods. A recent example of endohedral fullerenes includes single molecules of water encapsulated in C60.[8] Water endofullerene is a young compound and has been poorly studied. The most interesting in such endofullerenes is their hypothetical ability to transform into endohedral covalent derivatives, a new class of fullerene derivatives. One of the examples of the mentioned interconversions, induced by compression, has been studied by DFT methods.[9] According to state-of-the-art DFT calculations, noble gas endofullerenes should demonstrate unusual polarizability. Thus, calculated values of mean polarizability of Ng@C60 do not equal to the sum of polarizabilities of a fullerene cage and the trapped atom, i.e. exaltation of polarizability occurs.,.[10][11] The sign of the Δα polarizability exaltation depends on the number of atoms in a fullerene molecule: for small fullerenes (n30), it is negative (depression of polarizability). Sabirov has proposed the following formula, describing the dependence of Δα on n: Δα = αNg(2e−0.06(n – 20)-1). It describes the DFT-calculated mean polarizabilities of Ng@C60 endofullerenes with sufficient accuracy. The calculated data allows using C60 fullerene as a Faraday cage,[12] which isolates the encapsulated atom from the external electric field. The mentioned relations should be typical for the more complicated endohedral structures (e.g., C60@C240[13] and giant fullerene-containing onions [14]). Molecular endofullerenes[edit] Closed fullerenes encapsulating small molecules have been synthesized by long sequences of organic reactions. Notable achievements are the synthesis of the dihydrogen endofullerene H2@C60 and the water endofullerene H2O@C60 by the groups of Komatsu [15] and Murata.[16] The encapsulated molecules display unusual physical properties which have been studied by a variety of physical methods.[17] See also[edit] Fullerene ligands References[edit] Jump up ^ Gimenez-Lopez, Maria del Carmen; Chuvilin, Andrey; Kaiser, Ute; Khlobystov, Andrei N. (2011). "Functionalised endohedral fullerenes in single-walled carbon nanotubes". Chem. Commun 47 (7): 2116–2118. doi:10.1039/C0CC02929G. ^ Jump up to: a b c Chai, Yan; Guo, Ting; Jin, Changming; Haufler, Robert E.; Chibante, L. P. Felipe; Fure, Jan; Wang, Lihong; Alford, J. Michael; Smalley, Richard E. (1991). "Fullerenes wlth Metals Inside". Journal of Physical Chemistry 95 (20): 7564–7568. doi:10.1021/j100173a002. ^ Jump up to: a b Ge, Z; Duchamp, Jc; Cai, T; Gibson, Hw; Dorn, Hc (2005). "Purification of endohedral trimetallic nitride fullerenes in a single, facile step". Journal of the American Chemical Society 127 (46): 16292–8. doi:10.1021/ja055089t. PMID 16287323. ^ Jump up to: a b K.Muthukumar; J.A.Larsson (2008). "Explanation of the different preferential binding sites for Ce and La in M2@C80 (M = Ce, La)". Journal of Materials Chemistry 18 (28): 3347–51. doi:10.1039/b804168g. Jump up ^ Yamada, M; Nakahodo, T; Wakahara, T; Tsuchiya, T; Maeda, Y; Akasaka, T; Kako, M; Yoza, K; Horn, E; Mizorogi, N; Kobayashi, K; Nagase, S (2005). "Positional control of encapsulated atoms inside a fullerene cage by exohedral addition". Journal of the American Chemical Society 127 (42): 14570–1. doi:10.1021/ja054346r. PMID 16231899. Jump up ^ Saunders, M.; Jiménez-Vázquez, H. A.; Cross, R. J. and Poreda, R. J. (1993). "Stable compounds of helium and neon. He@C60 and Ne@C60". Science 259 (5100): 1428–1430. Bibcode:1993Sci...259.1428S. doi:10.1126/science.259.5100.1428. PMID 17801275. Jump up ^ Saunders, Martin; Jimenez-Vazquez, Hugo A.; Cross, R. James; Mroczkowski, Stanley; Gross, Michael L.; Giblin, Daryl E. and Poreda, Robert J. (1994). "Incorporation of helium, neon, argon, krypton, and xenon into fullerenes using high pressure". J. Am. Chem. Soc. 116 (5): 2193–2194. doi:10.1021/ja00084a089. Jump up ^ Kurotobi, Kei; Murata, Yasujiro (2012). "A Single Molecule of Water Encapsulated in Fullerene C60". Science 333 (6042): 613–6. Bibcode:2011Sci...333..613K. doi:10.1126/science.1206376. PMID 21798946. Jump up ^ Sabirov, Denis (2012). "From Endohedral Complexes to Endohedral Fullerene Covalent Derivatives: A DFT-Prognosis of Chemical Transformation of Water Endofullerene H2O@C60 upon its Compression". J. Phys. Chem. C 117 (2): 1178–1182. doi:10.1021/jp310673j. Jump up ^ Sabirov, D.; Bulgakov, R. (2010). "Polarizability exaltation of endofullerenes X@Cn (n = 20, 24, 28, 36, 50, and 60; X is a noble gas atom)". JETP Lett. 92 (10): 662–665. Bibcode:2010JETPL..92..662S. doi:10.1134/S0021364010220054. Jump up ^ Yan, Hong; Yu, Shengping; Wang, Xin; He, Yang; Huang, Wen; Yang, Mingli (2008). "Dipole polarizabilities of noble gas endohedral fullerenes". Chemical Physics Letters 456 (4–6): 223–226. Bibcode:2008CPL...456..223Y. doi:10.1016/j.cplett.2008.03.046. Jump up ^ Delaney, P.; Greer, J. C. (2004). "C60 as a Faraday cage". Applied Physics Letters 84 (3): 431. Bibcode:2004ApPhL..84..431D. doi:10.1063/1.1640783. Jump up ^ Zope, Rajendra R (2008). "Electronic structure and static dipole polarizability of C60@C240". Journal of Physics B: Atomic, Molecular and Optical Physics 41 (8): 085101. Bibcode:2008JPhB...41h5101Z. doi:10.1088/0953-4075/41/8/085101. Jump up ^ Langlet, R.; Mayer, A.; Geuquet, N.; Amara, H.; Vandescuren, M.; Henrard, L.; Maksimenko, S.; Lambin, Ph. (2007). "Study of the polarizability of fullerenes with a monopole–dipole interaction model". Diamond Relat. Mater 16 (12): 2145–2149. Bibcode:2007DRM....16.2145L. doi:10.1016/j.diamond.2007.10.019. Jump up ^ Komatsu, K.; Murata, M.; Murata, Y. (2005). "Encapsulation of Molecular Hydrogen in Fullerene C60 by Organic Synthesis". Science 307 (5707): 238–240. Bibcode:2005Sci...307..238K. doi:10.1126/science.1106185. PMID 15653499. Jump up ^ Kurotobi, K.; Murata, Y. (2011). "A Single Molecule of Water Encapsulated in Fullerene C60". Science 333 (6042): 613–616. Bibcode:2011Sci...333..613K. doi:10.1126/science.1206376. PMID 21798946. Jump up ^ Levitt, M. H. (2013). "Spectroscopy of light-molecule endofullerenes". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 371 (1998): 20120429. Bibcode:2013RSPTA.37120429L. doi:10.1098/rsta.2012.0429. External links[edit] Movie "Helium atom trapped in fullerene (C60) and dodecahedrane (C20H20)" (Youtube) Categories: FullerenesSupramolecular chemistry Navigation menu Not logged inTalkContributionsCreate accountLog inArticleTalkReadEditView history Search Go Main page Contents Featured content Current events Random article Donate to Wikipedia Wikipedia store Interaction Help About Wikipedia Community portal Recent changes Contact page Tools What links here Related changes Upload file Special pages Permanent link Page information Wikidata item Cite this page Print/export Create a book Download as PDF Printable version Languages Dansk Deutsch Русский Edit links This page was last modified on 4 January 2016, at 10:28. 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With a more precise clock, GPS accuracy could go from within 1-5 meters to accurate to 1 millimeter.
“At the moment, atomic clocks are room-sized. This endohedral fullerene would make it work on a chip that could go into your mobile phone,” Lucius Cary, director of the Oxford Technology SEIS fund – which holds a minor stake in Designer Carbon Materials – told Rebecca Burn-Callander at The Telegraph.
“There will be lots of applications for this technology,” he added. “The most obvious is in controlling autonomous vehicles. If two cars are coming towards each other on a country lane, knowing where they are to within 2 metres is not enough, but to 1 mm it is enough.”
Endohedral fullerenses has only one competitor for world’s most expensive material, antimatter. NASA estimates it would cost approximately $61 trillion to produce 1 gram of antimatter.
The material was sold by a spin off of the University of Oxford called Designer Carbon Materials.
