Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 20, Issue 31, Pages 9716-9724Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201304952
Keywords
carbenes; iridium; luminescence; pyrenes rhodium
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Funding
- Ministerio de Economia y Competitividad of Spain [CTQ2011-24055/BQU]
- UJI [P1.1B2011-22]
- Ministerio de Ciencia e Innovacion
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A series of pyrene-based bisazolium salts have been obtained starting from 4,5,9,10-tetrabromo-2,7-di-tert-butylpyrene. The synthetic procedure to the pyrene-bisazoliums (PBIs) reveals an unexpected behavior, as a consequence of the presence of the alkyl groups (alkyl=Me, Et, n-Pr, and n-Bu) coming from the trisalkoxyformate in the final products, instead of the expected tBu of tAmyl groups from the starting tetra-aminated pyrenes. All bisazoliums show fluo-rescence properties, with emissions in the range of 370-420 nm, and quantum yields ranging from 0.29 to 0.41. The PBIs were used as bis-NHC precursors in the preparation of a series of dirhodium and diiridium complexes, which have been fully characterized. The electrochemical studies on selected dimetallic complexes reveal that the electronic communication between the metals through the polyaromatic linker is negligible.
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