Platinum(II) complexes with amide-functionalized NHC ligands

We present the synthesis of neutral, amide-functionalized N-heterocyclic carbene (NHC) platinum(II) complexes with dianionic –N–CNHC–CNHC–N– (NC∗C∗N) tetradentate ligands. The imidazolium- and bisimidazolium bromide NHC ligand precursors with amide functionality in the side chain are reported together with the corresponding biscarbene bromido complexes and, after deprotonation, of the neutral NHC complexes without counterions. All compounds have been thoroughly characterized by standard techniques.

Graphical abstractNeutral, amide-functionalized N-heterocyclic carbene (NHC) platinum(II) complexes with dianionic N–C∗–C∗–N tetradentate ligands.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► The new NHC-based ligand binds to the metal either in a bi- or tetradentate fashion. ► The bidentate biscarbene is neutral, the tetradentate a dianionic N–C∗–C∗–N ligand. ► Synthesis of new Pt(II) complexes with amide-functionalized NHC ligands. ► Platinum(II) biscarbene (C∗–C∗) and tetradentate N–C∗–C∗–N complexes are reported.