Bis(triphenylphosphine)platinum chloride

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.[3] 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.

Bis(triphenylphosphine)platinum chloride[1]
Names
Other names
cis-dichlorbis(triphenylphosphine)platinum(II)
Identifiers
3D model (JSmol)
Properties
C36H30Cl2P2Pt
Molar mass 790.57 g·mol−1
Appearance white solid
Hazards
GHS pictograms
GHS Signal word Warning
H315, H319, H335
P261, P264, P271, P280, P302+352, P304+340, P305+351+338, P312, P321, P332+313, P337+313, P362, P403+233, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
Bis(triphenylphosphine)platinum chloride[2]
Names
Other names
trans-dichlorbis(triphenylphosphine)platinum(II)
Identifiers
Properties
C36H30Cl2P2Pt
Molar mass 790.57 g·mol−1
Appearance yellow solid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

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:[3]

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.[1]

The complex also undergoes photoisomerization.


See also

References
  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.
  3. Hsu, C. Y.; Leshner, B. T.; Orchin, M. (2007). "Trans Phosphine Complexes of Platinum(II) Chloride". Inorg. Synth. 19: 114–116. doi:10.1002/9780470132500.ch25.
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