195Pt and1H NMR studies of platinum(II) complexes with ethylenediamine derivatives

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Abstract
Complexes of the types Pt(L)Cl2, [Pt(L)(D2O)2](NO3)2, [Pt(L)(D2O)(NO3)](NO3), Pt(L)(OD)2, [Pt(L)(D2O)Cl]+and Pt(L)(OD)Cl, where L = ethylenediamine,N,N‐dimethylethylenediamine,N,N′‐dimethylethylenediamine andN,N,N′,N′‐tetramethylethylenediamine, were characterized mainly by195Pt and1H (high‐ and low‐field) nuclear magnetic resonance. The NMR spectra were measured in D2O. The dichloro complexes showed a195Pt resonance between −2355 and −2433 ppm (relative to Na2PtCl6) whereas the diaqua compounds absorbed at lower field from −1821 to −1977 ppm. The signals of the monoaqua‐monochloro species were observed at intermediate field between −2030 and −2173 ppm. The dihydroxo complexes showed a resonance at lower field (about 100 ppm) than the diaqua compounds, whereas the monochloro‐monohydroxo species absorbed at about 50 ppm from the monoaqua‐monochloro species. The monoaqua‐mononitrato compounds with only two ligands absorbed at about −20 ppm from the diaqua species. The high‐field proton NMR spectra of the complexes were also measured. The195Pt–1H coupling constants were obtained from the low‐field proton NMR spectra.