Sterically demanding multidentate ligand tris[(2-(6-methylpyridyl))methyl]amine slows exchange and enhances solution state ligand proton NMR coupling to (199)Hg(II).

ABSTRACT: The solution state coordination chemistry of Hg(ClO(4))(2) with tris[(2-(6-methylpyridyl))methyl]amine (TLA) was investigated in acetonitrile-d(3) by proton NMR. Although Hg(II) is a d(10) metal ion commonly associated with notoriously rapid exchange between coordination environments, as many as six ligand environments were observed to be in slow exchange on the chemical shift time scale at select metal-to-ligand ratios. One of these ligand environments was associated with extensive heteronuclear coupling between protons and (199)Hg and was assigned to the complex [Hg(TLA)](2+). The (5)J((1)H(199)Hg) = 8 Hz associated with this complex is the first example of five-bond coupling in a nitrogen coordination compound of Hg(II). The spectral complexity of related studies conducted in acetone-d(

SUBMITTER: Bebout DC 

PROVIDER: S-EPMC1560100 | biostudies-literature | 2002 May

REPOSITORIES: biostudies-literature