A theoretical study on the mechanistic highlights behind the Brønsted-acid dependent mer-fac isomerization of homoleptic carbenic iridium complexes for PhOLEDs
Recently, a successful Brønsted-acid mediated geometric isomerization of the meridional homoleptic carbenic iridium(III) complexes tris-(N-phenyl,N-methyl-benzimidazol-2-yl)iridium(III) (1) and tris-(N-phenyl,N-benzyl-benzimidazol-2-yl)iridium(III) (2) into their facial form has been reported. In th...
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| Main Authors: | , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
2017
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| In: |
Dalton transactions
Year: 2017, Volume: 46, Issue: 22, Pages: 7194-7209 |
| ISSN: | 1477-9234 |
| DOI: | 10.1039/C7DT01201B |
| Online Access: | Verlag, Volltext: http://dx.doi.org/10.1039/C7DT01201B Verlag, Volltext: https://pubs.rsc.org/en/content/articlelanding/2017/dt/c7dt01201b 
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| Author Notes: | Tobias Setzer, Christian Lennartz and Andreas Dreuw |
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| 520 | |a Recently, a successful Brønsted-acid mediated geometric isomerization of the meridional homoleptic carbenic iridium(III) complexes tris-(N-phenyl,N-methyl-benzimidazol-2-yl)iridium(III) (1) and tris-(N-phenyl,N-benzyl-benzimidazol-2-yl)iridium(III) (2) into their facial form has been reported. In the present work the pronounced acid-dependency of this particular isomerization procedure is revisited and additional mechanistic pathways are taken into account. Moreover, the acid-induced material decomposition is addressed. All calculations are carried out using density functional theory (DFT) while the environmental effects in solution are accounted for by the COSMO-RS model. The simulated results clearly reveal the outstanding importance of the complex interplay between acid strength, coordinating power of the corresponding base and the steric influence of the ligand system in contrast to the plain calculation of minimum energy pathways for selected complexes. Eventually, general rules to enhance the material-specific reaction yields are provided. | ||
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