Abstract
The valence isoelectronic imido analog H(2) S(NtBu)(4) (1) of sulfuric acid H(2) SO(4) was synthesized, isolated, and characterized by NMR spectroscopy and high-resolution X-ray charge density analysis. The latter reveals strongly polarized S(δ+) -N(δ-) bonds with virtually no double bond character. The easy-to-polarize S-N bonds are an advantageous and versatile feature of sulfur nitrogen ligands, which enables them to adapt to different electron requirements of various metal cations.