^1H-NMR Study of Ternary Platinum(II) Complexes with N-(1-Naphtyl)methyl-1,2-ethanediamine or N-(9-Anthrylmethyl)-1,2-ethanediamine and Bipyridine or Phenanthroline and Restricted Single Bond Rotation Due to Aromatic-Aromatic Ring Interaction

概要

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^1H-NMR spectra of square-planar complexes with the formula [Pt(L^1)(L^2)]X_2 where L^1 is 2,2'-bipyridine (bpy) or 1,10-phenanthroline (phen) and L^2 is N-(1-naphthyl)methyl-1,2-ethanediamine (Npen) or N-(9-anthryl)methyl-1,2-ethanediamine (Aten) indicate that the N-naphthylmethyl and N-anthrylmethyl groups are forced to adopt a pseudo axial disposition due to intramolecular repulsion of hydrogen atoms of the aromatic di-imines. The aromatic-aromatic interactions in the N-arylmethyl-1,2-ethanediamine complexes and aromatic di-imines caused them to undergo intramolecular stacking. ^1H-NMR spectra of these complexes showed a significant concentration and temperature dependence. The monomer-dimer equilibrium was estimated, based on the concentration dependency. Restricted single bond rotation was estimated from temperature dependency data. The rotation of the anthracene ring of the [Pt(bpy)(Aten)]^<2+> complex showed an activation energy of ca. 38kJ mol^<-1>, which is in good agreement with a mechanism involving successive rotations about single bonds with restriction by intramolecular aromatic-aromatic ring interactions.
公益社団法人日本薬学会の論文
2008-01-01