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Topic: Copper complexes with thiourea ligands  (Read 26260 times)

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Offline transient

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Copper complexes with thiourea ligands
« on: November 09, 2007, 10:38:05 AM »
Having problems with the structure and preparations of bisthioureacopper(II) sulfate & tristhioureacopper(I) sulfate

I expect tris(tu)copper(I) to be octahedral but is the copper(II) complex tetrahedral or square planar?

also to prepare tris(tu)copper(I)sulfate from copper(II)sulfate what would the correct reaction pathway be?

CuSO4 + 2tu --> [Cu(tu)2]SO4
[Cu(tu)2]SO4 + H2SO4 + tu --> [Cu(tu)3]SO4 ... ???
is the sulfuric acid acting as a reducing agent here? or is there something i'm missing?

please help can't find much about these compounds!!



Offline transient

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Re: Copper complexes with thiourea ligands
« Reply #1 on: November 12, 2007, 08:42:35 AM »
think i figured it out... hope i am right:

To produce a sample of tristhioureacopper(I)sulfate from a starting material of copper(II)sulphate we must do two things:
a)   Reduce the copper(II) to copper (I)
b)   Introduce the thriourea ligand

Conveniently the thiourea itself can act as a reducing agent via it’s own oxidation;

2CS(NH)2(aq) --> [(H2N)2CSSC(NH)2]2+(aq) + 2H+(aq) + 4e-(aq)   
Oxidation product exists as a dimer

The reduction reaction for the copper(II) is simply;
Cu2+(aq) + e-(aq) --> Cu+(aq)

The full redox equation being;
4CuSO4(s) + 2CS(NH2)2(s) --> 2Cu2SO4(s) + [(H2N)2CSSC(NH)2]SO4(l) + SO42-(aq)   
Observed as oily droplets

Reaction is carried forward by the reaction of Cu2SO4 with additional thiourea and the dimer produced above to form the final complex.

6CS(NH2)2(aq) +                      Cu2SO4(aq) -->  [Cu(CS(NH2)2)3]2SO4(s)

The final product exists as a dehydrate with an octahedral structure.


can anyone verify this please?

Offline rotator

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Re: Copper complexes with thiourea ligands
« Reply #2 on: February 28, 2008, 06:54:22 AM »
i mixed 2.5g of CuSO4.5H2O wid aqueous solution of 2.5 g thiourea.....precipitates of tristhioureacopper(1) sulfate were supposed to beformed...but it turned out to be a camel coloured gum like product.
     do i had to add sulfuric acid to get the product ?????in the procedure we r not asked to add the acid though....can some one help me wid this ???

Offline transient

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Re: Copper complexes with thiourea ligands
« Reply #3 on: February 28, 2008, 12:03:30 PM »
it's been a while since i carried out this experiment now but we had used a mixture of sulfurous acid & glacial acetic acid; i believe the purpose was to reduce our copper(II) starting product to a Copper(I) salt before adding the thiourea
but like i said it's been a while.

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