Supramolecular Architecture of 7-Azaindole Based Ag(I) Complexes

摘要

Nitrogen heterocycles are extensively used as ligands in coordination chemistry, and the search of new ligands for novel self-assembled metallosupramolecular architectures remains of great interest. Among the nitrogen heterocycles, especially, nitrogen-donor chelated organic ligands based on 7-azaindole have recently attracted considerable interest because of their applications in organic light-emitting diodes (OLEDs), coordination chemistry of main groups and/or transition metals, and their functionalities of potential building blocks for supra-molecular nanoengineering. Interestingly, the coordination modes to group 10 metal ions vary according to ligand used and the position of 7-azaindole unit in benzene ring. For example, the 1,3 -bis(7-azaindolyl)benzene ligand has been found to bind to Pd(II) or Pt(II) centers as a tridentate NCN-type through cyclometallation (type 1). In contrast, the 1,2-bis(7-azaindolyl) benzene ligand usually acts as a bidentate ligand through the two 7-azaindolyl groups (type 2), as shown in Chart 1.