Photophysical properties of 1,2,3,4,5-pentaarylcyclopentadienyl hydrotris(indazolyl)borate ruthenium(II) complexes

Sheng Gao (1) , Yohan Gisbert (2) , Guillaume Erbland (2) , Seifallah Abid (2) , Claire Kammerer (2) , Alessandro Venturini (1) , Gwénaël Rapenne (2, 3) , Barbara Ventura (1) , Nicola Armaroli (1)

1 ISOF - Istituto per la Sintesi Organica e la Fotoreattività
2 CEMES-GNS - Groupe NanoSciences
3 Nara Institute of Science and Technology

The photophysical properties of heteroleptic rotor-like Ru(II) complexes containing both a cyclopentadienyl-type ligand and a hydrotris(indazolyl)borate chelating unit with a piano stool structure (Ar5L1-Ru-S1 and L3-Ru-S1) and their corresponding subunits have been investigated. The complexes show peculiar absorption features when compared with their related ligands or fragments. L3-Ru-S1 was found to be non-emissive, while Ar5L1-Ru-S1 showed a weak emission with a quantum yield of 0.27%. With the help of DFT calculations, we demonstrate that the new absorption features can be attributed to ruthenium-based charge transfer transitions which involve the π* orbitals of the phenyl substituents of the cyclopentadienyl ligand.

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

Sheng Gao, Yohan Gisbert, Guillaume Erbland, Seifallah Abid, Claire Kammerer, et al.. Photophysical properties of 1,2,3,4,5-pentaarylcyclopentadienyl hydrotris(indazolyl)borate ruthenium(II) complexes. Physical Chemistry Chemical Physics, 2021, 23 (31), pp.17049-17056. ⟨10.1039/d1cp02261j⟩. ⟨hal-03636855⟩