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Author Topic: Green phosphorus?  (Read 13556 times)

Offline Limpet chicken

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Green phosphorus?
« on: 25/12/2004 19:00:26 »
I have heard some interesting talk of a green phosphorus allotrope, created possibly by quenching white P vapor down from 1200 C to -200 in liquid nitrogen/helium, apparently green, with a glassy crystalline appearance.

Has anyone heard of this before? I can't find any research journals on phosphorus allotropy covering this, and its not on an extensive chart of phosphorus allotropy I have, I am doing a home project on the allotropes of phosphorus, attempting to prepare and characterise all the different allotropes, but I only have 100 grams of white phosphorus to work with, so I would like to find out as much as I can, to save having to pay for more reagents and such, so has anyone heard of or seen this green form?


Non omnis moriar, tenebris e lumen.


Offline Supercryptid

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Re: Green phosphorus?
« Reply #1 on: 27/12/2004 04:11:05 »
I have never heard of this "green phosphorus" allotrope before, where exactly did you hear of it?

These are the only allotropes of phosphorus I know of:

White Phosphorus - Also called "yellow phosphorus". It is a molecular form composed of tetrahedron-shaped molecules with the formula P4.

Red Phosphorus - This form can be made by heating white phosphorus to 250 *C (482 *F), or by exposing white phosphorus to light. It is composed of polymer chains of phosphorus.

Black Phosphorus - Also called "purple" or "violet phosphorus". Black phosphorus can be formed by heating white phosphorus in the presence of a mercury catalyst and a seed crystal of black phosphorus. It is a polymeric form composed of sheets similar to the graphite structure, but is not planar.

Since you say that this "green phosphorus" is glassy in appearance, it may be an amorphic form with a structure similar to known allotropes of phosphorus, but lacking crystalline order. This could explain the strange color, since imperfections in a crystal often alter the color of a substance.

Offline Limpet chicken

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Re: Green phosphorus?
« Reply #2 on: 28/12/2004 00:35:34 »
Violet phosphorus, I think, is a distinct form, from black, AFAIK violet (hittorf's) phosphorus doesn't conduct electricity, whilst the black forms do.

Violet P is prepared by dissolving the amorphous type of red phosphorus in molten lead, then dissolving away the lead when cooled with HNO3.

There is also a scarlet modification prepared from PBr3, a dark red type, a brown allotrope, and apparently a grey vitreous glasslike form.

Black P can be prepared in the amorphous form by heating cubic white phosphorus at 200 C under 1200 atmospheres, in the orthorhombic form from the viteous gray type by heating to 400 C with a mercury catalyst for several days.

I think the rhombohedral type of black P is only metastable, as it is apparently prepared from orthorhombic and there is a reversible transition from 50-100 KB, from the rhombohedral to cubic structure there is a reversible transition at 110 kb.

I couldn't help wondering about the stability of this green form, with luck, it might just stay that way, and not slowly reverse itself after withdrawal from the liquid nitrogen.

On a slight tangent, but related to the topic in general, I have been looking around for liquid nitrogen or helium sources, and I don't think a tank of compressed nitrogen would be a problem, would it be as simple as turning the tank upside down, and venting the nitrogen as a liquid by not allowing it to expand be sufficient, or is are the thermos-flask type storage vessels essential, not for storing it, just for getting it to the liquid phase, as I have little experience with liquid nitrogen.

Non omnis moriar, tenebris e lumen.

Offline tups

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Re: Green phosphorus?
« Reply #3 on: 06/01/2005 14:53:26 »
Hmm .. I don't think there's an easy source of liquid nitrogen or helium, besides purchasing them from one of the liquified gas companies.
Turning a compressed gas cylinder upside down won't do you much good, as at room temperature both nitrogen and helium are well above their critical temperature, which means they won't turn into liquid, nbo matter how high the pressure.
About polymorphs of phosphor, I know nothing. Why are you researching this stuff ?


Offline Limpet chicken

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Re: Green phosphorus?
« Reply #4 on: 08/01/2005 05:51:45 »
I am what you could call a hobby scientist, I do it because I can, and because it interests me, and phosphorus just happens to be one of the elements you could call my "favourite", the one that mosts interests me, as there is such a wide field of chemistry behind it:)

Non omnis moriar, tenebris e lumen.

Offline Kurbatov57

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Re: Green phosphorus?
« Reply #5 on: 01/09/2006 12:25:28 »
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Offline lightarrow

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Re: Green phosphorus?
« Reply #6 on: 01/09/2006 13:26:15 »
What was it? Radioactive rain?

Offline bostjan

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Re: Green phosphorus?
« Reply #7 on: 02/09/2006 07:23:38 »
I've never heard of green phosphorus, but I think black phosphorous has a few allotropes of its own, including an amorphous allotrope.  But yes, violet and black phosphorus are different.

Phosphorus is indeed a very interesting chemical.

Offline lightarrow

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Re: Green phosphorus?
« Reply #8 on: 09/09/2006 08:19:07 »
Originally posted by Limpet chicken

I am what you could call a hobby scientist, I do it because I can, and because it interests me, and phosphorus just happens to be one of the elements you could call my "favourite", the one that mosts interests me, as there is such a wide field of chemistry behind it
Do you know a way to make phosphorus at laboratory?

The Naked Scientists Forum

Re: Green phosphorus?
« Reply #8 on: 09/09/2006 08:19:07 »


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