Fullerenes
Dirk Bruere at Neopax
What are pure fullerenes like to look at?
Powder? Do they cake? Are they slippery? What colour (not in soln)? etc
Anyone tasted any?
--
Dirk
The Consensus:-
The political party for the new millenium
http://www.theconsensus.org
Oscar Lanzi III
"ordinary" carbon?
--OL
Steve Turner
wrote:
>If fullerenes were to be concentrated, would they self-react to give
>"ordinary" carbon?
What do you mean by "fullerenes?" Buckminsterfullerene itself is a
stable solid which has been isolated and characterized. Aldrich even
sells it, though it's expensive (roughly a dollar per mg).
Steve Turner
hanson
news:2gpvbvF...@uni-berlin.de...
> Tried a quick google, but could not find the simple info.
> What are pure fullerenes like to look at?
> Powder? Do they cake? Are they slippery?
> What colour (not in soln)? etc
> Anyone tasted any?
>
[hanson]
On practically an subject/object it is difficult to find
Basic lexicon/dictionary type info on the web.
130,000 google web hits for == fullerene ==
http://www.godunov.com/Bucky/Patents.html (Patents)
http://sbchem.sunysb.edu/msl/fullerene.html :
C60-Fullerene at 153 deg.K.
http://www.sussex.ac.uk/Users/kroto/FullereneCentre/gallery/main.html
http://www.mindspring.com/~kimall/Fuller/fullerenes.html
Fullerenes are large carbon-cage molecules. By far the most
common one is C60-- also called a "buckyball"-- but some other
relatively common ones are C70, C76, and C84 (there are plenty
of others too).
Chemically, they are quite stable; breaking the balls requires
temperatures of over 1000 degrees C (the exact number depends
on which particular fullerene). At much lower temperatures (a few
hundred degrees C) fullerenes will "sublime," which means vapor
will form directly from the solid. The balls don't break; they just
separate from the solid intact. This property is used in growing
crystals and thin films of fullerenes.
http://www.mindspring.com/~kimall/Fuller/c60.html
C60 solid is cubic, weakly bound, and electrically insulating
(for those who know what this means, the gap is about 2.3 eV).
Pure C60 is interesting. Visually, it is quite different from both
graphite and diamond-- it is a yellow powder which turns pink
when dissolved in certain solvents such as toluene.
When exposed to strong ultraviolet light, such as from a laser,
the buckyballs polymerize, forming bonds between adjacent
balls. In the polymerized state, the C60 no longer dissolves in
toluene. The fact that it changes properties upon exposure to light
makes C60 "photosensitive," and it has been used as a photoresist in
certain photolithographic processes.
K3C60 is a metal and a superconductor......
The most detailed info you want is in here:
http://www.ifw-dresden.de/iff/14/forschg/fulleren/wassindfullerene/
Fullerene zeigen ein stark unterschiedliches Lösungsverhalten. Gute
Lösungsmittel sind nach [7, 8, 9] CS2, o-Dichlorbenzen, Toluen und Xylen.
Fullerene sind in Wasser unlöslich und an Luft stabil.
*** Good solvents are CS2, o-Dichlorbenzene, Toluene und Xylene.
Dünne Schichten aus Fullerenen erscheinen gelb bis gelbgrün.
*** Thin layers of Fullerene are yellow to yellow green.
Lösungen der Fullerene gefärbt:
*** Solutions of Fullerenes are colored:
- C60 purpur- bis violettrot ******* purple to deep red
- C70 tieforangerot ******* depp orange red
- C76 hellgelbgrün ******* light yellow green
- C2v-C78 kastanienbraun, ******* marroon-bown
- D3-C78 goldgelb, ******* golden yellow
- C84 braun ******* brown
- C86 olivgrün. ******* olive green
Erhitzt man Fullerene unter Luftabschluß über 1500 °C,
verwandeln sich diese unter Wärmeabgabe in Graphit.
***** heated to > 1500°C, in absence of air,
***** Fullerenes change into Graphite.
Elsewhere, Fullerenes are used in/as lubricants functioning
as nano sized ball bearings.
In medicine they have be used to carry and delivery drugs
into target areas in the body (that may be conjecture).
C-nanoubes, a Fullerene variation, is has recently been discussed
in sci. physics. It is feared that they might be carcinogenic (?)
in analog fashion to Chrysotile (asbestos)
hanson