Abstract
In the square-planar cycloplatinated complex of R–phenylethylamine, both additional substituents, an anionic iodo and a neutral donor ligand, have been replaced by chelating ethylenediamine. A very pronounced trans influence is observed in the cationic product complex: Two significantly different bond distances to the chelating ligand are found, the longer in trans geometry to the coordinated carbon atom. The positive charge of the monocationic complex is balanced by an uncoordinated iodide. This target solid crystallizes with four independent cations and anions in the unit cell; pairs of complex cations related by pseudo-inversion are stabilized by T stacking. Classical N–H···I hydrogen bonds lead to a layer structure in the (0 1 0) plane.
Highlights
In 1968, the first orthometalation reactions of tertiary benzyl amines with palladium and platinum were conducted by Cope and Friedrich [1]
Substitution—even under mild conditions—is possible, via formation of a suitable intermediate: When the iodo ligand is precipitated with silver salts of weakly coordinating anions, a Pt(II) aqua complex is obtained, and the coordinated water molecule is readily displaced by anionic or neutral nucleophiles [4]
We communicate the substitution of both monodentate ligands, σ donor amine and iodo substituent by the well-known chelating ligand ethylenediamine, and we report the crystal structure of the resulting ionic product
Summary
In 1968, the first orthometalation reactions of tertiary benzyl amines with palladium and platinum were conducted by Cope and Friedrich [1]. Substitution—even under mild conditions—is possible, via formation of a suitable intermediate: When the iodo ligand is precipitated with silver salts of weakly coordinating anions, a Pt(II) aqua complex is obtained, and the coordinated water molecule is readily displaced by anionic or neutral nucleophiles [4]. In this contribution, we communicate the substitution of both monodentate ligands, σ donor amine and iodo substituent by the well-known chelating ligand ethylenediamine, and we report the crystal structure of the resulting ionic product. Organoplatinum (II) complexes of ethylenediamine derived from substituted rather than primary amines have been published by Kvam et al [5] and Failes et al [6]
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