Английская Википедия:Bis(triphenylphosphine)platinum chloride

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Bis(triphenylphosphine)platinum chloride is a metal phosphine complex with the formula PtCl2[P(C6H5)3]2. Cis- and trans isomers are known. The cis isomer is a white crystalline powder, while the trans isomer is yellow.[1] Both isomers are square planar about the central platinum atom. The cis isomer is used primarily as a reagent for the synthesis of other platinum compounds.

Preparation

The cis isomer is the prepared by heating solutions of platinum(II) chlorides with triphenylphosphine. For example, starting from potassium tetrachloroplatinate:

K2PtCl4 + 2 PPh3 → cis-Pt(PPh3)2Cl2 + 2 KCl

The trans isomer is the prepared by treating potassium trichloro(ethylene)platinate(II) (Zeise's salt) with triphenylphosphine:[1]

KPt(C2H4)Cl3 + 2 PPh3 → trans-Pt(PPh3)2Cl2 + KCl + C2H4

With heating or in the presence of excess PPh3, the trans isomer converts to the cis complex. The latter complex is the thermodynamic product due to triphenylphosphine being a strong trans effect ligand.

In cis-bis(triphenylphosphine)platinum chloride, the average Pt-P has a bond distance of 2.261 Å and the average Pt-Cl has a bond distance of 2.346 Å.[2] In trans-bis(triphenylphosphine)platinum chloride, the Pt-P distance is 2.316 Å and the Pt-Cl distance is 2.300 Å.[3]

The complex also undergoes photoisomerization.

Photoisomerization of (Ph3P)2PtCl2

See also

References

Шаблон:Reflist

Шаблон:Platinum compounds

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  1. ↑ 1,0 1,1 Шаблон:Cite book
  2. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Fun не указан текст
  3. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Johansson&Otto не указан текст
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