Electronic and geometrical manipulation of the excited state of bis-terdentate homo- and heteroleptic ruthenium complexes |
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Authors: | Dinda Joydev Liatard Sébastien Chauvin Jérôme Jouvenot Damien Loiseau Frédérique |
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Affiliation: | Département de Chimie Moléculaire, UMR CNRS 5250, ICMG - FR 2607, Université Joseph Fourier, BP 53, 38041, Grenoble Cedex 9, France. |
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Abstract: | This work describes the synthesis and characterization of two new bis-terdentate Ru(II) complexes. Compound 1 is a homoleptic complex containing two CNC N-heterocyclic carbene (NHC) based ligands, whereas compound 2 bears one CNC ligand and an ancillary terpyridine ligand. The redox and photophysical properties of both compounds have been investigated and their X-ray crystal structures determined. Complex 1 displays a close-to-perfect octahedral coordination geometry and is not luminescent at room temperature while complex 2 features room temperature and 77 K luminescence despite its partially distorted geometry. The presence of the NHC moieties brings a significant amount of electronic density to the metal centre therefore lowering its oxidation potential with respect to that of analogous polypyridyl complexes. |
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