X-ray structures versus NMR signals in pentacoordinate [PtX 2 (η 2-CH2=CH2)(Me2phen)] (X= Cl, Br, I) complexes

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Abstract

Abstract The single crystal X-ray structure of the pentacoordinate complex [PtBr2(η2-CH2double bond; length as m-dashCH2)(Me2phen)], Me2phen = 2,9-dimethyl-1,10-phenanthroline, is here reported for the first time. Comparison of the complete series of [PtX2(η2-CH2double bond; length as m-dashCH2)(Me2phen)] (X = Cl, Br, I) X-ray structures shows a very low variability of the bond lengths and angles, in the trigonal equatorial plane (where η2-olefin and Me2phen are bound), on varying the coordinated axial halogens. In first approximation, this suggests describing as independents and not interacting the two subsystems constituted by the metal bonds with axial (X–Pt–X) and equatorial ligands (Me2phen–Pt–η2-ethene). This means that the electric charge donated to the metal, by the axial ligands, cannot substantially modify the bonds of the metal with the ligands in the trigonal equatorial plane. The 1H, 13C, 15N and 195Pt NMR chemical shifts variations, studied as a function of the ionic radius of the axial halides are here discussed. The NMR data strongly suggest the existence of electric pseudo-ring currents circulating around the Pt–X axes and modulated by the ionic radius of the coordinated halides.

Autore Pugliese

Tutti gli autori

  • M. Benedetti , P. Papadia , C. R. Girelli , F. D. Castro , F. Capitelli , F. P. Fanizzi

Titolo volume/Rivista

INORGANICA CHIMICA ACTA

Anno di pubblicazione

2015

ISSN

0020-1693

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

Ultimo Aggiornamento Citazioni

Non Disponibile

Numero di citazioni Scopus

9

Ultimo Aggiornamento Citazioni

28/04/2018

Settori ERC

Non Disponibile

Codici ASJC

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