Nucleophilic Attack of Amine to Chloro (8 -Quinolinolate) W η2-Alkene Platinum (II) Compounds: Formation of Stable σ-(2-Ammonioethanide) Platinum (II) Compounds

Ibrahim M. Al-Najjar and Hamad A. Al-Lohedan

Department of Chemistry, College of Science, King Sand University* Riyadh-11451 Saudi Arabia

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ABSTRACT:

Particularly stable 2-ammonioethanide compounds are prepared and characterized when amines attack the π bonded ethene, propene and cis-but-2-ene in chloro (8-quninolinoIate) (η2-aIkene) platinum (II) compounds. When 2-ammoniethanide compounds (amCHRCHR *Pt) are formed, the direction of attack is determined by electronic rather than steric effects. Equd-ibeium constants have been measured for the reaction am + Ptn (i^-CHRCHR*) m am* CHRCH~R*Pt and are discussed in terms of the nature of attacking amine (am) and show that steric factors tend to prevent the formation of the 2-ammonioethanide compounds.

KEYWORDS:

Nucleophilic; Amine