Anthony crasto buckyball

Anthony crasto buckyball or Buckminsterfullerene presentation, helping millions, million hits on google

1. A SHORT PRESENTATION MAR 2012 Buckminsterfullerene or Buckyball, Review BY DR ANTHONY MELVIN CRASTO [email protected]

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5. Buckminsterfullerene

6. BUCKYBALLS                 The discovery of a new form of a pure element is a rather rare occurrence, especially for a common element. Therefore, reports of such discoveries generate an unusual amount of excitement among scientists. An example is the 1985 discovery of a new allotropic form of elemental carbon. The two well-known forms of elemental carbon are graphite and diamond. Both of these contain extended arrays of carbon atoms. In the new form, the carbon atoms are arranged in relatively small clusters of atoms.

7. Harold Kroto Richard Smalley Discovery                                                                                                                        Theoretical predictions of buckyball molecules appeared in the late 1960s – early 1970s,but they went largely unnoticed. In the early 1970s, the chemistry of unsaturated carbon configurations was studied by a group at the  University of Sussex , led by Harry Kroto and David Walton. In the 1980s a technique was developed by Richard Smalley and Bob Curl at  Rice University , Texas to isolate these substances. They used laser  vaporization  of a suitable target to produce clusters of atoms. Kroto realized that by using a  graphite  target any carbon chains formed could be studied.

8. IUPAC name [hide] (C 60 -I h )[5,6]fullerene Other names [hide] Buckyball ; Fullerene-C60; [60]fullerene Identifiers CAS number 99685-96-8   PubChem 123591 ChemSpider 110185   ChEBI CHEBI:33128   Beilstein Reference 5901022 Jmol -3D images Image 1 SMILES [show] InChI [show] Properties Molecular formula C 60 Molar mass 720.64 g mol −1 Appearance Dark needle-like crystals Density 1.65 g/cm 3 Melting point sublimates at ~600 °C [1] Solubility  in  water insoluble in water Structure Crystal structure Face-centered cubic, cF1924 Space group Fm3m, No. 225 Lattice constant a  = 0.14154 nm

9. Diamond Graphite C60 Crystal Structure cubic hex. fcc density (g cm-3) 3.30 2.27 1.65 Lattice constant (A) 3.513 a=2.456 14.15 - b=6.696 - C-C length (A) 1.54 1.42 1.455 C=C length - - 1.391 Standard heats of formation (k cal mol-1) 0.4 0.0 9.08 bulk modulus (G Pa) 1200 207 18(174) melting point (K) 3700 3800 sublm . 800 index of refraction 2.42 - 2.2 (600nm) conductivity insulator conductor semi conductor resistivity (ohm m) 1 x 10E18 1.37 x 10E-5 1 x 10E14 (room temp) naturally occuring deposit kimberlite pegmatite shungite SOME PROPERTIES OF CARBON

10. C - C length (gas phase) 1.458 Å C = C 1.410 Å Cage Diameter 7.11 Å C60 - C60 nearest approach 3.1 Å Ionisation Potentials C60 to C60+ 7.6 ± 0.2 eV C60+ to C60 2+ 12.25 ± 0.5 eV C602+ to C60 3+ 17.0 ± 0.7 eV C60 3+ to C60 4+ 21.7 eV by extrapolation Electron affinity 2.6 eV Band Gap 1.8 eV relative permitivity 4.4 ± 0.2 absorption coefficients 6.07 x 10E5 cm-1 @ 220 nm (thin film) 1.21 x 10E5 cm-1 @ 442 nm Further properties of Buckminsterfullerene  

11. Solubility (at 303 K) carbon tetrechloride 0.45 mg ml-1 benzene 1.44 mg ml-1 toluene 2.15 mg ml-1 carbon disulphide 5.16 mg ml-1 hexane 0.04 mg ml-1

12. The serendipitous discovery of a third allotropic form in 1985, uncovered a fundamentally different structure of closed carbon cages, which were to become known as  fullerenes . This new family of non-planar carbon compounds has generated immense interest within the scientific community in such a short period of time, with thousands of papers published about fullerenes and fullerene-based materials to date.In the early 1970's, the chemistry of unsaturated carbon configurations was studied by a group at the University of Sussex, led by  Harry Kroto  and  David Walton . They developed methods for synthesising long chain  polyynes , whose vibration-rotation dynamics were studied by microwave spectroscopy. They then used these observations for molecular radioastronomy . From 1975-78 they studied the long-chained  polyynylcyanides ,  HC 5 N ,  HC 7 N  and  HC 9 N . These molecules were detected in the cloud material of the interstellar medium by radioastronomy . These molecules turned out to be produced by red giant stars.

13. In the 1980's a technique was developed by  Richard Smalley  and  Bob Curl  at Rice University, Texas. They used laser vaporisation of a suitable target to produce clusters of atoms. Kroto realised that by using a graphite target, that the cluster apparatus would be ideal to probe the formation of carbon chains, and so planned a collaboration between his group at Sussex and the one at Rice. The Sussex/Rice experiment took place in September 1985. The technique probed the carbon plasma produced by the laser vaporisation by time-of-flight mass spectrometry. The experiments confirmed that large carbon chain/clusters were being formed. During the experiments it was noted that the peak for the C 60  molecule (and to a lesser extent C 70 ) behaved unusually and formed under all conditions as well as exhibiting great stability. The experimental evidence, a strong peak at 720 amu (atomic mass units), indicated that a carbon molecule with sixty carbon atoms was forming, but provided little structural information. The research group concluded after reactivity experiments, that the most likely structure was a spheroidal molecule. Kroto mentioned Fuller's geodesic dome structures, which contained  pentagons  as well as  hexagons . The idea was quickly rationalised as the basis of an icosohedral symmetry closed cage structure. The geodesic and electronic bonding factors in the structure accounted for the stability of the molecule, and it was named after  Buckminster Fuller .

14.        In graphite, the carbon atoms are arranged in sheets with the bonds between the atoms forming hexagons, something like chicken wire. The sheets are only weakly bonded to each other, so they slide past one another, giving graphite a slippery feel and making it a good lubricant. Graphite is also used extensively in studies of the surface effects of energy in the form of light, heat, and electric current. When graphite is subjected to large bursts of energy of these sorts, portions of the top sheet of carbon atoms are ripped out. The ejected portions are studied to learn how the energy interacts with a solid surface.                In the early 1980s, Harold W. Kroto of the University of Sussex in England was using microwave spectroscopy to analyze the composition of carbon-rich stars. The analysis indicated that the atmosphere of these stars contained cyanopolyynes , which are composed of chains of alternating carbon and nitrogen atoms. Prof. Kroto wanted to study how these chains could be formed. He contacted Robert F. Curl and Richard E. Smalley at Rice University in Texas because they had been using microwave spectroscopy to analyze clusters of metals formed in Prof. Smalley’s lab. Prof. Smalley had an apparatus that could vaporize nearly any material into a plasma. In 1985, Kroto joined Curl and Smalley in Smalley’s lab to study the products of carbon vaporization. They fired a high-energy laser beam at a graphite surface and used a stream of helium gas to carry the fragments into a mass spectrometer. The mass spectrometer revealed the masses of the fragments of graphite ejected from the surface. These fragments varied from several atoms up to about 190 atoms. The distribution of fragments depended on the pressure of helium in the carrier stream. As the pressure increased from several torr to about 1 atm , the distribution of fragments changed, and the fragment containing sixty carbon atoms became by far the dominant one. Because the laser pulse and graphite surface had not changed, they reasoned that the fragments that broke off were not changing, but instead that the way these fragments interacted on their way into the mass spectrometer changed. At higher helium pressures, the fragments would be jostled together more than at lower pressures. This jostling leads to the formation of the most stable form of small carbon atom cluster, namely C60.

15. What is  Buckminsterfullerene ? In 1985 a  new   allotrope  of  carbon  ( C 60 ) was discovered. Sixty carbon   atoms  form the shape of a  ball  like a  football with a  carbon atom  at each  corner of the  20 hexagons  and  12 pentagons . Each  carbon atom  (shown below as a circle) has  three bonds . The size of the molecule is almost exactly  1 nm  in  diameter . The  ratio  of the size of an  ordinary soccer ball to the planet  Earth  is the  same  as the  ratio  of the size of a  C 60   molecule  to a  soccer ball . These are  not  called  giant   molecules because there are  only sixty atoms . A  large   number  of these  molecules  can fit together to form a  transparent yellow   solid  called  fullerite .

16. This form of carbon was named after the American architect Buckminster Fuller, who was famous for designing a large geodesic dome which looked similar (sort of) to the molecular structure of C 60 . Many other balls of carbon called fullerenes, have since been made, including C 70 , C 76 , and C 84 . These molecules have become known as " buckyballs ". Fullerenes are used as  catalysts  and  lubricants . They are also  used  in  nanotubes  for strengthening materials (for eaxample   sports equipment ) and are sometimes used as a way of  delivering drugs  into the body

17.       Kroto , Smalley, and Curl wondered how the atoms in this cluster were arranged to make it more stable than other clusters. They believed that its stability came from an arrangement in which all bonding capacity of the atoms is satisfied. In a small fragment of carbon-atom sheet ejected from a graphite surface, the atoms around the edge of the sheet would not be fully bonded. If, however, the sheet were to form into a ball so the edges would meet, the bonding capacity of all atoms would be satisfied. In thinking of how the atoms are arranged in this ball, the scientists considered the geodesic domes designed by the architect-engineer, R. Buckminster Fuller. These domes led them to suspect a structure of interlocking hexagons and pentagons, identical to those of a soccer ball. Because this idea was inspired by the geodesic dome, they named this C60 allotrope of carbon buckminsterfullerene.

18. The amounts of buckminsterfullerene (“ buckyballs ,” for short) prepared by laser were extremely small. The evidence for the structure would remain sketchy until C60 could be prepared in larger quantities. Such a preparation was discovered in 1990. In this method, a water-cooled cylinder contains a sharp graphite rod touching a graphite disk. The cylinder is evacuated to a pressure of 1 × 10 - 5 torr , and a current of 100 to 200 ampere is passed between the rod and the disk. This produces a soot that deposits on the walls of the cylinder. The soot is washed with toluene, producing a red-brown solution. When this solution is evaporated, it leaves a residue with a mass of about 10% of the original soot and containing more than 85% C60. With this method, about 1 gram of C60 can be produced in a day.                 A whole new chemistry has developed in which fullerene molecules are manipulated to form compounds. Because the C60 sphere is hollow, other atoms can be trapped within it. When a graphite sheet soaked in LaCl3 solution is subjected to vaporization-condensation experiments, a substance with formula LaC60 is formed. When other metal salts are used, the ball of carbon atoms can be shrunken with laser pulses to fit the metal ion within. In this way, CsC48 and KC44 were formed. Other experiments have produced new materials with C60. For example, C60 doped with potassium is a superconductor below 18 Kelvin. In the C60 structure, other atoms have been substituted for the carbon atoms, producing derivatives such as C59N and C57B3. C60 has also been used to produce three-dimensional polymers. In addition, tubes of carbon atoms called nanotubes have also been made. In 1996, Harold Kroto , Richard Smalley, and Robert Curl shared the Nobel Prize in Chemistry for their discovery of buckminsterfullerene.

19. Beam-experiments conducted between 1985-90 provided more evidence for the stability of C 60  as well as supporting the closed cage structural theory and predicting some of the bulk properties such a molecule would have. Around this time, intense theoretical group theory activity also predicted that C60 should have only four IR active vibrational bands, on account of its icosohedral symmetry.In 1989, the Heidelberg/ Tuscon group, led by physicists  Wolfgang Krätschmer  and  Donald Huffman  had observed unusual IR and UV features in thin carbon films produced by arc-processed graphite rods. Among other features, the IR spectra showed four discrete bands in close agreement to those proposed for C 60 . A paper published by the group in 1990 followed on from their thin film experiments, and detailed the extraction of a benzene soluble material from the arc-processed graphite. This extract was found to crystallise and X-ray analysis consistent with arrays of spherical C 60  molecules, approximately 7Å in diameter. The C 60  molecule has two bond lengths - the 6:6 ring bonds can be considered "double bonds" and are shorter than the 6:5 bonds - see below - the "shorter bonds" are highlighted for clarity:

20. In 1990, W. Krätchmer and D. R. Huffman's developed a simple and efficient method of producing fullerenes in gram and even kilogram amounts which boosted the fullerene research. In this technique, carbon soot is produced from two high-purity graphite electrodes by igniting an arc discharge between them in an inert atmosphere (helium gas). Alternatively, soot is produced by laser ablation of graphite or  pyrolysis  of  aromatic hydrocarbons . Fullerenes are extracted from the soot using a multistep procedure. First, the soot is dissolved in appropriate organic solvents. This step yields a solution containing up to 75% of C 60 , as well as other fullerenes. These fractions are separated using  chromatography . [12]

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22. ^   Buckminsterfullerene and Buckyballs – Definition, Discovery, Structure, Production, Properties and A . AZoM.com. July 15, 2006 ^  Katz, 374 ^  Beck, Mihály T.; Mándi , Géza (1997). "Solubility of C 60 ".  Fullerenes, Nanotubes and Carbon Nanostructures   5  (2): 291. doi : 10.1080/15363839708011993 . ^   Bezmel'nitsyn , V.N.; Eletskii , A.V.; Okun ', M.V. (1998). "Fullerenes in solutions".  Physics- Uspekhi   41  (11): 1091.  Bibcode 1998PhyU...41.1091B .  doi : 10.1070/PU1998v041n11ABEH000502 . ^   Ruoff , R. S.; Tse , Doris S.; Malhotra , Ripudaman ; Lorents , Donald C. (1993). "Solubility of fullerene (C60) in a variety of solvents".  Journal of Physical Chemistry   97  (13): 3379.  doi : 10.1021/j100115a049 . ^  M. S. Dresselhaus ; G. Dresselhaus ; P. C. Eklund (20 February 1996).  Science of fullerenes and carbon nanotubes . Academic Press. pp. 437–.  ISBN   978-0-12-221820-0 . Retrieved 26 December 2011. ^   Talyzin , A.V. (1997). "Phase Transition C60−C60*4C6H6in Liquid Benzene".  Journal of Physical Chemistry B   101  (47): 9679. doi : 10.1021/jp9720303 . ^   Talyzin , A.V.; Engström , I. (1998). "C70 in Benzene, Hexane, and Toluene Solutions".  Journal of Physical Chemistry B   102  (34): 6477. doi : 10.1021/jp9815255 . ^  a   b  Katz, 372 ^  Katz, 361 ^  Katz, 379 ^   Kaz , 381 ^

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24. ^  "Electronic structure of superconducting Ba _{6}C_{60}".  Physical Review B   47 : 14657. 1993.  arXiv : cond -mat/9301006 .  Bibcode 1993PhRvB..4714657E .  doi : 10.1103/PhysRevB.47.14657 . ^  "Strong Superconductivity with Local Jahn -Teller Phonons in C_{60} Solids".  Physical Review Letters   90 : 167006. 2003.  Bibcode 2003PhRvL..90p7006H .  doi : 10.1103/PhysRevLett.90.167006 .  PMID   12731998 . ^  Capone, M.; Fabrizio , M; Castellani , C; Tosatti , E (2002). "Strongly Correlated Superconductivity".  Science   296  (5577): 2364–6.  arXiv : cond -mat/0207058 .  Bibcode   2002Sci...296.2364C .  doi : 10.1126/science.1071122 .  PMID   12089436 . ^   Fullerene Hydration ^   Andrievsky , G; Klochkov , V.K.; Bordyuh , A.B.; Dovbeshko , G.I. (2002). "Comparative analysis of two aqueous-colloidal solutions of C60 fullerene with help of FTIR reflectance and UV–Vis spectroscopy".  Chemical Physics Letters   364 : 8.  Bibcode   2002CPL...364....8A . doi : 10.1016/S0009-2614(02)01305-2 . ^   Andrievsky , G.; Klochkov , V.; Derevyanchenko , L. (2005). "Is the C 60 Fullerene Molecule Toxic?!".  Fullerenes, Nanotubes , and Carbon Nanostructures   13  (4): 363.  doi : 10.1080/15363830500237267 . ^   Andrievsky , GV; Bruskov , VI; Tykhomyrov , AA; Gudkov , SV (2009). "Peculiarities of the antioxidant and radioprotective effects of hydrated C60 fullerene nanostuctures in vitro and in vivo".  Free radical biology & medicine   47  (6): 786–93.  doi : 10.1016/j.freeradbiomed.2009.06.016 . PMID   19539750 . ^  Katz, 385 ff.

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26. Buckminster Fuller's Dome - Expo '67 Montreal -  Courtesy of B. Eggen (Univ. of Sussex)

27.   It's stronger than it looks. It superconducts (conducts electricity really well) when you fiddle with it enough. It insulates (doesn't conduct at all) on that same token. It conducts like an ordinary metal. It even semiconducts (a bit like silicon) under the right conditions. You can make it switch between all these states by playing with it. Some pharmaceutical companies are developing products containing C 60  to make you look younger. However, C 60  has not been tested properly for toxicity yet. Some people have made transistors out of it. It's hollow, so you can wrap it around single atoms and trap them 'in a cage'. Somebody went and made an amplifier using a single molecule of it. It's optically active, meaning that if you put it in front of a light source, you can use it to switch the light on and off, and things like that. It can be really useful if you are a telecommunications engineer. Bioactivity is another application, C 60  can be made to fiddle with DNA and some sugars. Because the molecule is a tiny strong sphere, it can be used as a microscopic ball bearing for very small machines. There are more applications and a great many academic papers have been published concerning C 60 , but the list could become long and boring and it's growing daily. It could also be the first step into nanotechnology. So there you have it: a molecule so new and weird, they don't even know what to do with it yet. Applications?

28. 13 C NMR A C60 B C70

29. solid* Gas phase Ar matrix (cm-1) 1429.0 1406.9 1431.9 1182.5 1169.1 1184.8 576.5 570.3 579.3 527.0 527.0 530.0 (micro m) 6.998 7.108 6.984 8.456 8.554 8.440 17.35 17.53 17.26 18.87 18.98 18.87 SPECTROSCOPIC DATA Rotational constant 0.0028 cm-1 IR active bands - four T1u 

30. nm cm-1 log emax eV 211.0 47393 5.20 5.88 227.4 43975 4.95 5.46 256.6 38971 5.24 4.83 328.4 30451 4.72 3.78 377.0 26525 3.79 3.29 404.0 24754 3.47 3.07 UV and visible bands (hexane)   a broad weak band also exists between 440 - 670 nm. Also detected are bands assigned to the ions; C60+ at 973 nm and C60- at 1068 nm. 

31. reactions

32. Aromaticity It appears that although it is not entirely impossible to find some spots where buckminsterfullerene is aromatic, it seems unlikely that the molecule can have delocalized π electrons all throughout the cage at all times. Because of the particular arrangement of hexagons and pentagons, what chance of delocalization there may be is spread out thinly throughout the cage. Therefore, the aromatic character of C60 is low such that it acts more like an alkene. It is also important to note that aromaticity is not often a completely black-and-white issue; unless something is antiaromatic, the molecule may be better described as having a relative degree of aromaticity to another molecule. Still, I would not say that this qualitative method is adequate in ascertaining that C60 is low in aromaticity.

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