Fullerene C70

Gefahreninformationscode (GHS)

• Bildanzeige (GHS)

  

• Alarmwort

  Warnung

• Gefahrenhinweise

  H228：Entzündbarer Feststoff.

  H315：Verursacht Hautreizungen.

  H319：Verursacht schwere Augenreizung.

  H335：Kann die Atemwege reizen.

• Sicherheit

  P210：Von Hitze, heißen Oberflächen, Funken, offenen Flammen und anderen Zündquellenarten fernhalten. Nicht rauchen.

  P261：Einatmen von Staub vermeiden.

  P280：Schutzhandschuhe/Schutzkleidung/Augenschutz tragen.

  P305+P351+P338：BEI KONTAKT MIT DEN AUGEN: Einige Minuten lang behutsam mit Wasser spülen. Eventuell vorhandene Kontaktlinsen nach Möglichkeit entfernen. Weiter spülen.

  P405：Unter Verschluss aufbewahren.

Fullerene C70 Chemische Eigenschaften,Einsatz,Produktion Methoden

• Beschreibung

  High-purity [5,6]-Fullerene-C70 (carbon 70 fullerenes, or C70) for use in thermal evaporation systems, where increased optical absorption is important.

• R-Sätze Betriebsanweisung:

  R36/37:Reizt die Augen und die Atmungsorgane.

• S-Sätze Betriebsanweisung:

  S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
  S36:DE: Bei der Arbeit geeignete Schutzkleidung tragen.

• Chemische Eigenschaften

  BLACK FINE CRYSTALLINE POWDER

• Verwenden

  Fullerene powder is used in chemical research. It is extensively used for several biomedical applications including the design of high-performance MRI contrast agents, X-Ray imaging contrast agents, photodynamic therapy and drug and gene delivery.

• Definition

  ChEBI: C70 fullerene is a fullerene.

• Allgemeine Beschreibung

  This product has been enhanced for energy efficiency.

• läuterung methode

  It was purified from the soluble toluene extract (400mg) of the soot (Fullerite) formed from resistive heating of graphite by adsorption on neutral alumina (100g, Brockmann I, 60 x 8cm). Elution with toluene/hexane (5:95 v/v) gives ca 250mg of quite pure C6 0. It has characteristic spectral properties (see below). Further elution with toluene/hexane (20:80 v/v, i.e. increased polarity of solvent) provides 50mg of "pure" C7 0 [Allemand et al. J Am Chem Soc 113 1050 1991]. Chromatography on alumina can be improved by using conditions which favour adsorption rather than crystallisation. Thus the residue from toluene extraction (1g) in CS2 (ca 300mL) is adsorbed on alumina (375g, standard grade, neutral ca 150 mesh, Brockmann I) and loaded as a slurry in toluene/hexanes (5:95 v/v) to a 50 x 8cm column of alumina (1.5Kg) in the same solvent. To avoid crystallisation of the fullerenes, 10% of toluene in hexane is added quickly followed by 5% of toluene in hexane after the fullerenes had left the loading fraction (2-3hours). With a flow rate of 15mL/minute the purple C6 0 fraction is eluted during a 3-4hour period. Evaporation of the eluates gives 550-630mg of product which, after recrystallisation from CS2/cyclohexane yields 520-600mg of C60 which contains adsorbed solvent. On drying at 275o/10-3mm for 48hours a 2% weight loss is observed although the C60 still contains traces of solvent. Further elution of the column with 20% of toluene in hexane provides 130mg of C7 0 containing 10-14% of C60 (by NMR). This was rechromatographed as above using a half scale column and adsorbing the 130mg in CS2 (20mL) on alumina (24g) and gave 105mg of recrystallised C7 0 (containing 2% of C6 0). The purity of C6 0 can be improved further by washing the crystalline product with Et2O and Me2CO followed by recrystallisation from *C6H6 and vacuum drying at high temperatures. Carbon soot from resistive heating of a carbon rod in a partial helium atmosphere (0.3bar) under specified conditions is extracted with boiling *C6H6 or toluene, filtered and the red-brown solution is evaporated to give crystalline material in 14% yield which is mainly a mixture of fullerenes C6 0 and C7 0. Chromatographic filtration of the 'crude' mixture with *C6H6 allows no separation of components, but some separation was observed on silica gel TLC with n-hexane or n-pentane, but not cyclohexane as eluents. Analytical HPLC with hexanes (5_m Econosphere silica) gave satisfactory separation of C6 0 and C7 0 (retention times of 6.64 and 6.93minutes respectively) at a flow rate of 0.5mL/minute and using a detector at 256nm. HPLC indicated the presence of minor (<1.5% of total mass) unidentified Cn species with retention times of 5.86 and 8.31minutes. Column chromatography on flash silica gel with hexane gives a few fractions of C6 0 with
  95% purity, but later fractions contain mixtures of C6 0 and C7 0. These can be obtained in 99.85 and >99% purity, respectively, by column chromatography on neutral alumina. [Ajie et al. J Phys Chem 94 8630 1990.] Separation of C60 and C7 0 can be achieved by HPLC on a dinitroanilinopropyl (DNAP) silica (5_m pore size, 300. pore diameter) column with a gradient from n-hexane to 50% CH2Cl2 using a diode array detector at wavelengths 330nm (for C6 0) and 384nm (for C7 0). [Cox et al. J Am Chem Soc 113, 2940, 1991.] Soxhlet extraction of the "soot" is a good preliminary procedure, or if material of only ca 98% purity is required. Soxhlet extraction with toluene is run (20 minutes per cycle) until colourless solvent filled the upper part of the Soxhlet equipment (10 hours). One-third of the toluene remained in the pot. After cooling, the solution was filtered through a glass frit. This solid (purple in toluene) was ca 98% C6 0. This powder was again extracted in a Soxhlet using identical conditions as before, and the C60 was recrystallised from toluene to give 99.5% pure C60. C70 has greater affinity than C6 0 for toluene. [Coustel et al. J Chem Soc,

Fullerene C70 Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

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