Cationic iridium complexes with intramolecular π-π Interaction and enhanced steric hindrance for solid-state light-emitting electrochemical cells

Hsiao Fan Chen, Wen Yi Hung*, Shou Wei Chen, Ting Chih Wang, Shih Wei Lin, Shu Hua Chou, Chih Teng Liao, Hai-Ching Su, Hsiao An Pan, Pi Tai Chou, Yi Hung Liu, Ken Tsung Wong

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)12114-12121
Number of pages8
JournalInorganic Chemistry
Volume51
Issue number22
DOIs
StatePublished - 19 Nov 2012

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