Sciencemadness Discussion Board

Potassium compounds

D4RR3N - 9-1-2007 at 09:20

First post on this forum, a reader for a while.

I am interested in the following potassium compounds but had no luck in finding any info or suppliers. Firstly I would like to know if these compounds are possible and secondly how could I produce them in a small quantity from relatively common chemicals.

KCuO2
KAgO2
KWO2

"edit"

I was looking at the archives and noticed that “brauer” is often thought as an authority on similar compounds, sorry to ask but who is Brauer and what book?

[Edited on 9-1-2007 by D4RR3N]

Bromine - 9-1-2007 at 10:17

potassium cuprate can be made by disolving CuO in KOH solution.

woelen - 9-1-2007 at 11:07

I don't think the other compounds exist.

falconZ - 9-1-2007 at 11:12

Handbook of Preparative Inorganic Chemistry,
by Georg Brauer
Publisher: Academic Press (1963)
ASIN: B000M0IVDQ

D4RR3N - 9-1-2007 at 11:26

Quote:
Originally posted by Bromine
potassium cuprate can be made by disolving CuO in KOH solution.



Thanks, will this produce KCuO2 or KCuO3 ??? Is it just a matter of heating the solution to get the KCuO2 solid?

D4RR3N - 9-1-2007 at 11:49

Quote:
Originally posted by falconZ
Handbook of Preparative Inorganic Chemistry,
by Georg Brauer
Publisher: Academic Press (1963)
ASIN: B000M0IVDQ



Just looked on Amazon $595:o

kaviaari - 9-1-2007 at 11:56

Quote:
Originally posted by D4RR3N
Just looked on Amazon $595:o


Just look from http://www.sciencemadness.org/library/index.html :) Those books are lifesavers to any chemist!

h0lx - 9-1-2007 at 12:55

Wolframates exist, but I believe they were WO3 or WO4

woelen - 9-1-2007 at 23:31

Wolframates (tungstates) do exist, but they have tungsten in the +6 oxidation state, the formula KWO2 suggests a +3 oxidation state. Actually I have some tungstate, the compound Na2WO4.

guy - 9-1-2007 at 23:42

When you acidify tungstates (and molybdenates), you get a cluster...but its not just a random cluster, its a set amount; ive always wondered why? If anyone knows the chemistry behind that.

Ozone - 10-1-2007 at 20:34

I'm too tired now to explain all of that (clustering) in detail (in fact, clusters are a hot-topic these days). Check out coordination number and the 18 electron rule (which includes 14, 24, and others...). It is quite do-able. For example, to have metal-metal- quadruple bonds; see tetrabutylammonium-octachlorodirhenate, for example (I had to make it as an undergrad; they blew it up at Sandia).

Coordination occurs frequently without a change in formal oxidation state (excepting, usually, oxidative addition and reductive eliminations); for more on this look at olefin pi complexes.

Hope that helps, goodnight all,

O3