1404084-12-3Relevant academic research and scientific papers
Cationic iridium complexes with intramolecular π-π Interaction and enhanced steric hindrance for solid-state light-emitting electrochemical cells
Chen, Hsiao-Fan,Hung, Wen-Yi,Chen, Shou-Wei,Wang, Ting-Chih,Lin, Shih-Wei,Chou, Shu-Hua,Liao, Chih-Teng,Su, Hai-Ching,Pan, Hsiao-An,Chou, Pi-Tai,Liu, Yi-Hung,Wong, Ken-Tsung
, p. 12114 - 12121 (2013/01/15)
Cationic iridium complexes incorporated 4,5-diaza-9,9'-spirobifluorene as NWN ancillary ligands, in which one (2) or two (3) phenyl groups were introduced onto 4,5-diazafluorene to afford intraligand π-π interactions. The X-ray crystal structures of complexes 2 and 3 show that the pendant phenyl ring forms strong intramolecular face-to-face π-stacking with the difluorophenyl ring of the cyclometalated ligand with distances of 3.38 for complex 2 and 3.40 and 3.46 for complex 3. This π-π stacking interaction minimizes the expansion of the metal-ligand bonds in the excited state, resulting in a longer device lifetime in the light-emitting electrochemical cell (LEC) devices.
