期刊
INORGANIC CHEMISTRY
卷 52, 期 18, 页码 10292-10305出版社
AMER CHEMICAL SOC
DOI: 10.1021/ic400600d
关键词
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资金
- European Union (CELLO) [STRP 248043, CIG 322280]
- Spanish Ministry of Economy and Competitiveness (MINECO) [MAT2011-24594, CTQ2009-08790, CTQ2012-31914, CSD2007-00010]
- European FEDER funds [CTQ2012-31914]
- Generalitat Valenciana [PROMETEO/2012/053]
- Italian Ministry of Research (MIUR) (PRIN-INFOCHEM) [CX2TLM]
- Italian Ministry of Research (MIUR) (FIRB Futuro in Ricerca SUPRACARBON) [RBFR10DAK6]
- Consiglio Nazionale delle Ricerche (CNR) [MACOL PM. P04. 010]
- Consiglio Nazionale delle Ricerche (CNR) (Progetto Bandiera N-CHEM)
- FPU grant of the Spanish Ministry of Education, Culture and Sport (MECD)
Charged cydometalated (C<^>N) iridium(III) complexes with carbene-based ancillary ligands are a promising family of deep-blue phosphorescent compounds. Their emission properties are controlled primarily by the main C<^>N ligands, in contrast to the classical design of charged complexes where N<^>N ancillary ligands with low-energy pi* orbitals, such as 2,2'-bipyridine, are generally used for this purpose. Herein we report two series of charged iridium complexes with various carbene-based ancillary ligands. In the first series the CAN ligand is 2-phenylpyridine, whereas in the second one it is 2-(2,4-difluorophenyl)-pyridine. One biscarbene (:C<^>C:) and four different pyridine carbene (N<^>C:) chelators are used as bidentate ancillary ligands in each series. Synthesis, X-ray crystal structures, and photophysical and electrochemical properties of the two series of complexes are described. At room temperature, the :C<^>C: complexes show much larger photoluminescence quantum yields (Phi(PL)) of ca. 30%, compared to the N<^>C: analogues (around 1%). On the contrary, all of the investigated complexes are bright emitters in the solid state both at room temperature (1% poly(methyl methacrylate) matrix, Phi(PL) 30-60%) and at 77 K. Density functional theory calculations are used to rationalize the differences in the photophysical behavior observed upon change of the ancillary ligands. The N<^>C:-type complexes possess a low-lying triplet metal-centered ((MC)-M-3) state mainly deactivating the excited state through nonradiative processes; in contrast, no such state is present for the :C<^>C: analogues. This finding is supported by temperature-dependent excited-state lifetime measurements made on representative N<^>C: and :C<^>C: complexes.
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