Syntesis of [(Ph3P)2CuS2MoS2Cu(PPh3)]

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The discussion focuses on the challenges of equilibrating and understanding the synthesis of [(Ph3P)2CuS2MoS2Cu(PPh3)]. The synthesis pathway involves multiple reactions, starting from the formation of (NH4)2MoS4 and leading to the final compound through several intermediates. A specific method for synthesizing (n-Pr4N)2[(CN)CuS2MoS2] is detailed, highlighting the use of KCN and (n-Pr4N)Br to produce a red precipitate. The participant expresses difficulty in balancing the reaction equations and seeks clarification on the stoichiometric aspects of the synthesis process. Overall, the thread emphasizes the need for clearer guidance on the synthesis and balancing of complex organometallic reactions.
Bibinou
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Good morning,

I have problems in equilibrating a synthesis reaction. The pathway is given :
(NH4)6Mo7024.4H2O +28 H2S+8 NH4OH--> 7(NH4)2MoS4 + 36 H20
(NH4)2MoS4 (CuCN/KCN/[Pr4N)Br]) --> (Pr4N)2[(CN)CuS2MoS2]
(Pr4N)2[(CN)CuS2MoS2] + Cu(PPh3)2(NO3) --> [(Ph3P)2CuS2MoS2Cu(PPh3)]

I don't really see how to equilibrate the 2 last ones and I have also problems to explain really what occurs during this synthesis. I found a contribution from the department of chemistry in Australia. The follwing paragraph explains how works the second reaction :

Synthesis of (n-Pr4N)2[(CN)CuS2MoS2]

a solution of KCN (O.64g 9.8mmol) in H2O (7 cm3) is added to a suspension of NH4CuMoS4 (3g 9.8mmol) in H2O (30 cm3) to produce a deep red solution.
A solution of (n-Pr4N)Br (5.2g 19.6 mmol) in H20 (10cm3) is added dropwise producing a red precipitate.
The mixture is stirred 15min before the compound which is washed with H2O, EtOH and ether and dried in air, is isolated. (yield 65% 4.35g)

Ph4As+ et Et4N+ may be prepared in a similar manner. The compounds may also be prepared by combinating equimolar aqueous solution of (NH4)2[MoS4] and [Cu(CN)x ]^(1-x) (produced by combinatingCuSO4.5H20 orCuCN with KCN) followed by the addition of 2-3 equivalents of the quaternary cation.

Thank you very much for your help.
 
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Hello
Did you unserstand me good... because I come from France and I hope my English il good enough to explain where are my problems :rolleyes:
 
I don't believe we have a specialist here in organometallic synthesis, in addition I'm not quite sure what you're referring to by "equilibriate."
 
In fact I mean "balance"
 
balancing the reaction equation stoichiometrically?
 
yes stoichiometrically! otherwise it's not "balancing"
 
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