Bis(triphenylphosphine)platinum chloride

Bis(triphenylphosphine)platinum chloride or dichlorbis(triphenylphosphine)platinum(II) is a metal phosphine complex with the formula PtCl2[P(C6H5)3]2. There are two isomers: 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 molecules.

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 → Pt(PPh3)2Cl2 + KCl + C2H4

Heat or excess phosphine ligand causes the trans isomer to isomerize to the white 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]

  1. ^ M. H. Johansson; S. Otto (2000). "trans-Dichlorobis(triphenylphosphine-P)platinum(II)". Acta Crystallogr. C 56: e12–e15. doi:10.1107/S010827019901608X. 
  2. ^ H.-K. Fun; S. Chantrapromma; Y.-C. Liu; Z.-F. Chen; H. Liang (2006). "cis-Dichlorobis(triphenylphosphine-κP)platinum(II)". Acta Crystallogr. E 62: m1252–m1254. doi:10.1107/S1600536806016540. 

See also

References

  1. 1 2 Hsu, C. Y.; Leshner, B. T.; Orchin, M.; Laurent, M. (2007). Inorg. Synth. 19: 114–116. doi:10.1002/9780470132500.ch25. Missing or empty |title= (help)
  2. ↑
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