Abstract
A series of complexes of the type trans-[PtCl2(olefin)(imine)] olefin = ethene, propene, cis- or trans-but-2-ene; imine =N-alkyl-1-(N-methylpyrrol-1-yl)ethanimine; alkyl = Me, Pri, Bui, Bus, But) have been synthesized and studied by 1H, 13C, and 195Pt n.m.r. spectroscopic methods. The H3 and C3 of the pyrrole ring couple to 195Pt with nJ(195Pt–1H) 8.3 Hz and nJ(195Pt–13C) 16.6–20.5 Hz, which are too large for five- and four-bond coupling constants respectively, thereby suggesting a Pt[graphic omitted]H–C interaction. Furthermore, long-range coupling constants were observed between different protons of the imine and 195Pt. In addition,1H and 13C n.m.r. spectra of (η2-trans-but-2-ene) complexes show inequivalence of the proton and carbon atoms of the olefin. The 1H, 13C, and 195Pt data are discussed in terms of the donor and acceptor properties of the imine ligands.
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