Potassium tetraiodoplatinate

Potassium tetraiodoplatinate is the inorganic compound with the formula K₂PtI₄·(H₂O)₂. It is the potassium salt of tetraiodoplatinate, a square planar complex of platinum(II). The compound crystallizes from water as the dihydrate,^[1] whereas the related chloride and bromide K₂PtCl₄ and K₂PtBr₄ are obtained only as the anhydrous salts.

Potassium tetraiodoplatinate

Identifiers
CAS Number	14708-56-6 anhydrous
3D model (JSmol)	Interactive image dihydrate: Interactive image
PubChem CID	12864171
InChI InChI=1S/4HI.2K.Pt/h4*1H;;;/q;;;;2*+1;+2/p-4 Key: WYVJXXSNNPZRSS-UHFFFAOYSA-J dihydrate: InChI=1S/4I.2K.2H2O.Pt/h;;;;;;2*1H2;/q4*-1;2*+1;;;+2 Key: FVUALNGXMHIQHF-UHFFFAOYSA-N
SMILES [K+].[K+].[I-][Pt+2]([I-])([I-])[I-] dihydrate: [K+].[K+].[I-][Pt+2]([I-])([I-])[I-].O.O
Properties
Chemical formula	H4I4K2O2Pt
Molar mass	816.928 g·mol−1
Appearance	black solid
Density	4.31 g/cm3[1]
Related compounds
Other anions	Potassium tetrachloroplatinate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

It reacts with amines and with ammonia to give charge-neutral derivatives PtI₂(RNH₂)₂.^[2] The compound is prepared by the salt metathesis reaction of potassium iodide and potassium tetrachloroplatinate:^[3]

K₂PtCl₄ + 4 KI → K₂PtI₄ + 4 KCl

Potassium tetraiodoplatinate is a precursor to the anticancer drug cisplatin.