Synthesis and Photophysical Properties of Butterfly-shaped Dinuclear Pt(II) complex having NHC-based Chelate Ligands

Abstract A butterfly-shaped dinuclear Pt(II) complex having pyridyl-NHC chelate ligands and bridging Me 2 pz ligands was synthesized. The crystal structure of the Pt 2 complex showed short intramolecular Pt⋯Pt distance (3.129 A) and unique packing structure containing one-dimensional infinite pore that was filled with solvent molecules. The absorbance was proportional to the concentration of Pt 2 complex and no significant bands appeared even in high concentration (up to 100 μM). The Pt 2 complex showed bluish-green emission (λ max  = 459 nm) in the solid state at 298 K (λ ex  = 330 nm). TD-DFT calculation revealed that the lowest-energy absorption bands are mainly assigned to the combination of metal-to-ligand charge transfer (MLCT) and ligand-to-ligand charge transfer (LLCT) transitions.