Molecular engineering for optical properties of 5-substituted-1,10-phenanthroline-based Ru(II) complexes

Elodie Rousset (1) , Olivier Mongin (2) , Juliette Moreau (1) , Latevi Max Lawson Daku (3) , Marc Beley (4) , Philippe Gros (4) , Sylviane Chevreux (1, 5) , Mireille Blanchard-Desce (6) , Gilles Lemercier (1)

1 ICMR - Institut de Chimie Moléculaire de Reims - UMR 7312
2 ISCR - Institut des Sciences Chimiques de Rennes
3 UNIGE - Université de Genève = University of Geneva
4 L2CM - Laboratoire Lorrain de Chimie Moléculaire
5 ENSCP - Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL
6 ISM - Institut des Sciences Moléculaires

A series of homo- and heteroleptic Ru(II) complexes [Ru(phen)3−n(phen-X)n](PF6)2 (n = 0–3, X = CN, epoxy, H, NH2) were prepared and characterized. The influence of electron-withdrawing or electron-releasing substituents of the 1,10-phenanthroline ligands on the photo-physical properties was evaluated. It reveals fundamental interests in the fine tuning of redox potentials and photo-physical characteristics, depending both on the nature of the substitution of the ligand, and on the symmetry of the related homo- or heteroleptic complex. These complexes exhibit linear absorption and two-photon absorption (2PA) cross-sections over a broad range of wavelength (700–900 nm) due to absorption in the intra-ligand charge transfer (ILCT) and the metal-to-ligand charge transfer (MLCT) bands. These 2PA properties were more particularly investigated in the 700–1000 spectral range for a family of complexes bearing electro-donating ligands (phen-NH2).

Domaines: Chimie de coordination; Chimie théorique et/ou physique

Elodie Rousset, Olivier Mongin, Juliette Moreau, Latevi Max Lawson Daku, Marc Beley, et al.. Molecular engineering for optical properties of 5-substituted-1,10-phenanthroline-based Ru(II) complexes. Dalton Transactions, 2021, 50 (29), pp.10119-10132. ⟨10.1039/D1DT00886B⟩. ⟨hal-03251344⟩