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An unusual example is the egg-shaped fullerene Tb 3 N@ C 84 , which violates the isolated pentagon rule. [ 60 ] Evidence for a meteor impact at the end of the Permian period was found by analyzing noble gases preserved by being trapped in fullerenes.
The example above would then be denoted M@C 60 if M were inside the carbon network. A more complex example is K 2 (K@C 59 B), 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]
Fullerene purification is the process of obtaining a fullerene compound free of contamination. In fullerene production mixtures of C 60 , C 70 and higher homologues are always formed. Fullerene purification is key to fullerene science and determines fullerene prices and the success of practical applications of fullerenes.
The method was simple and efficient to prepare the material in gram amounts per day (1990) which has boosted the fullerene research and is even today applied for the commercial production of fullerenes. The discovery of practical routes to C 60 led to the exploration of a new field of chemistry involving the study of fullerenes.
Polyfullerene is a basic polymer of the C 60 monomer group, in which fullerene segments are connected via covalent bonds into a polymeric chain without side or bridging groups. They are called intrinsic polymeric fullerenes, or more often all C 60 polymers. Fullerene can be part of a polymer chain in many different ways.
Bingel reaction of fullerene with a malonate ester and a) sodium hydride or DBU in toluene at room temperature 45% yield. An alternative to the Bingel reaction is a fullerene diazomethane reaction. N-(Diphenylmethylene)glycinate Esters [3] in a Bingel reaction take a different conjugate course and react to a fullerene dihydropyrrole.
C 70 fullerene is the fullerene molecule consisting of 70 carbon atoms. It is a cage-like fused-ring structure which resembles a rugby ball, made of 25 hexagons and 12 pentagons , with a carbon atom at the vertices of each polygon and a bond along each polygon edge.
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