Electronic and geometrical manipulation of the excited state of bis-terdentate homo- and heteroleptic ruthenium complexes

Joydev Dinda (1) , Sébastien Liatard (2) , Jérôme Chauvin (2) , Damien Jouvenot (2) , Frédérique Loiseau (2)

1 DCM - Département de Chimie Moléculaire
2 DCM - CIRE - Département de Chimie Moléculaire - Chimie Inorganique Redox

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.

Mots clés: Ruthenium; photochemistry; photophysics; tridentate

Domaines: Chimie de coordination

Joydev Dinda, Sébastien Liatard, Jérôme Chauvin, Damien Jouvenot, Frédérique Loiseau. Electronic and geometrical manipulation of the excited state of bis-terdentate homo- and heteroleptic ruthenium complexes. Dalton Transactions, 2011, 40, pp.3683. ⟨hal-00702892⟩