N-N J-coupling across a metal center (2JNN) was clearly detected in a biological macromolecule (DNA duplex) for the first time. By using 2JNN, the base pairing mode of mercury-mediatedT-T pairs (T-HgII-T) was definitely determined. This pairing mode was found to be a novel metal ion-binding mode for DNA and RNA molecules, in which imino proton-metal exchange processes are included. Accordingly, 2JNN is highly important for the determination of the chemical structures of metal-mediated base pairs.
ASJC Scopus subject areas
- 化学 (全般)