1H NMR spectra of a series of complexes [PtCl(Eugenol-1H)(amine)] (amine: pyridine, 4-Me-pyridine, quinoline, p-cloaniline, p-toluidine)

Abstract

The ¹H NMR spectra of five complexes of the genenal formula [PtCl(eugenol-1H)(amine)] (amine: pyridine (2), 4-Me-pyridine (3), quinoline (4), p-cloaniline (5), p-toluidine (6)) in d₆-acetone and CDCl₃ solvents were studied. The result showed that in d1-chloroform, complexes 2÷5 gave two stable over time sets of signals which corresponded with two existence forms of the complexes in the solution: two strong intermolecular interactions (Cl₃C-H…ClPt(II) hydrogen bond and Cl₂HC-Cl…Pt(II) halogen bond) for 2, 3, 4; and two strong hydrogen bonds (NH₂…Cl-Pt(II) intramolecular bond and Cl₃C-H…Cl-aniline intermolecular bond) for 5. Meanwhile, in d₆-acetone solvent, complexes containing aniline derivatives, 5 and 6, revealed an isomerization, that was, the amine group transfered from cis position to trans position compared with the allyl group of eugenol. This conversion process reached an equilibrium after 48 hours.