Multinuclear 195Pt and 15N magnetic resonance spectroscopic studies of the reaction of K[PtCl3(NH3)] with KI and amines

✍ Scribed by Y. Qu; N. Farrell; M. Valsecchi; L. de Greco; S. Spinelli

• Publisher: John Wiley and Sons
• Year: 1993
• Tongue: English
• Weight: 452 KB
• Volume: 31
• Category: Article
• ISSN: 0749-1581
• DOI: 10.1002/mrc.1260311009

✦ Synopsis

Abstract

Reaction of the platinum complex K[PtCl~3~(NH~3~)] with NH~3~ or NH~2~(CH~2~)~n~NH~2~ in the presence of I^−^ gives the mixed chloroiodoamine complexes cis‐[PtCl~3~(NH~3~)~2~] and [{cis‐Pt(Cl)~3~(I)(NH~3~)~2~}~2~μNH~2~(CH~2~)~n~NH~2~], respectively. These findings prompted an examination of the nature of the reaction of K[PtCl~3~(NH~3~)] with I^−^ in detail. Rapid displacement of two chlorides to give the trans‐[Pt(I)~2~Cl(NH~3~)]^−^ anion is observed with a subsequent slow displacement of the third chloride to give the [PtI~3~(NH~3~)]^−^ anion. Concomitant with the formation of the triiodo anion, dimerization occurs, giving the iodo‐bridged compound [PtI~2~(NH~3~)]~2~. Correlation of δ(^195^Pt) and δ(^15^N) chemical shifts and ^1^J(^195^Pt,^15^N) coupling constants was made with literature values, allowing a complete set of data for the series [PtX~n~(NH~3~)~4 − n~]^(2 − n)+^ with systematic variation of X (Cl,I) to be presented.