Solid-phase synthesis of iridium complexes with quinazolinone ligands

ORGN 817

Wen-Ren Li, ch01@ncu.edu.tw, Nai-Mu Hsu, Chun-Mei Yang, Purushottam M. Dewang, Yu-Chin Huang, Tzu-Sheng Lin, and Bi-Han Hu. Department of Chemistry, National Central University, Chung-Li, 32054, Taiwan
Combinatorial techniques have been found tremendous useful in the search of new drugs. However, the materials discovery has not yet benefited significantly from outstanding advantages of these approaches. Only a few exceptional attempts applied combinatorial methods to discover materials with novel photophysical properties. Moreover, among above reports most of the materials are organic compounds. Several researchers have reported immobilization of organometallic complexes on polymer supports. The optimization of desired properties of organometallic materials using the library approach is yet in nascent stages. An efficient parallel solid-phase synthetic method for iridium complexes is reported here. The yields of final products starting from Wang resin ranged between 30 and 42% which correspond to about 90% yield per step in this 11-step synthetic sequence. This methodology possesses versatility to modify three different functionalities on the template of iridium complexes to optimize and fine-tune photophysical properties required for their applications in organic light-emitting diodes.