Exploring the Unknown: CO2-V Network Solid

[bomba923]

Well, we know how quartz and glass are a network SiO₂ molecules

*But what if we replace the Si atoms with carbon? In other words, what if we have the same network arrangement of CO₂ molecules?

-Is there a name for this network solid?

Edit:
Perhaps I am referring to "CO₂-V", possibly?

 

[NoTime]

I don't think I know what you are asking.
CO₂ is a gas, unless its quite cold.
Then it's usually called dry ice.

 

[bomba923]

I don't think I know what you are asking.
CO₂ is a gas, unless its quite cold.
Then it's usually called dry ice.

I am not referring to dry ice~

Dry ice is a molecular solid; I'm referring to a network solid,
with molecular units CO₂, just as quartz/glass is SiO₂.

http://www.btinternet.com/~chemistry.diagrams/SIO2-3UN.GIF (<-click on the link)
The red spheres represent the oxygen atoms,
and the cyan spheres represent carbon atoms.

~Possibly, I may be referring to CO₂-V,
(see http://www.llnl.gov/str/Yoo.html)
but I am not sure...

 

[Gokul43201]

Well, we know how quartz and glass are a network SiO₂ molecules

*But what if we replace the Si atoms with carbon? In other words, what if we have the same network arrangement of CO₂ molecules?

-Is there a name for this network solid?

The network solid you describe does not exist at NTP. The reasons for this are the smaller covalent radius of C (compared to Si, which is large enough to accommodate O-atoms in tetrahedral voids) and the higher polarity of CO2 compared to SiO2.

At very high pressures though, I believe some kind of CO2 network solid has been made.

 

[rctrackstar2007]

CO2 won't form a network solid no. C will in the form of coal or diamond and such but you can't compact a gas to form glass

 

[bomba923]

CO2 won't form a network solid no. C will in the form of coal or diamond and such but you can't compact a gas to form glass

Not under NTP, as Gokul mentioned. But under large pressures...

http://www.llnl.gov/str/Yoo.html

it has been done (according to the linked article).

 

[trinitrotoluene]

Electron shells

The reason that CO2 will not form the network solid as iwould silicon or even sulphur is due to the intermediate electron d shell that is present in these but not in carbon. this shell allows silicon to fulfill more energy states and form a more stable compound. but it does prevent it from forming long chain molecule as carbon will, i.e. dodecane

 

[rctrackstar2007]

Not under NTP, as Gokul mentioned. But under large pressures...

http://www.llnl.gov/str/Yoo.html

it has been done (according to the linked article).

oh wow that had not been brought to my attention until just now

that's quite useful info, thank you

 

[bomba923]

http://www.llnl.gov/str/Yoo.html][/PLAIN]
Stabilizing CO2-V

If this new, very hard CO2-V can be stabilized at ambient temperatures and pressures, it will have many uses. (...etc ...etc) New classes of high explosives, nonlinear optical materials with high thermal and mechanical stability, high-strength glass, and superhard materials for tools are all candidates. Crystals that can double the frequency of laser light from infrared to green would be valuable for Livermore's inertial confinement fusion energy program (...etc ...etc)

Hmm...
so can CO₂-V be stabilized at all (at NTP) ??

(CO₂-V being the "quartzlike" CO₂ I mentioned earlier)

 

[Gokul43201]

Hmm...
so can CO₂-V be stabilized at all (at NTP) ??

That's probably a question that can only be answered by researchers in the field.

What is well-known is that it has become almost commonplace to be able to stabilize high temperature phases of diffferent systems at well below their equilibrium phase transition temperatures. There hasn't been as much success with stabilizing high pressure phases. This particular phase, the CO2-V is a high temperature and high pressure phase.

It will take the discovery of a truly rare and well-hidden reaction pathway that cuts through the giant activation energies needed to reach the phase in question. Does such a pathway exist? No idea.