Alkynylgold(I) C 3 -Chiral Concave Complexes: Aggregation and Luminescence

Jing Zhang , Astrid Schaly (1) , Jean-Claude Chambron (2) , Bruno Vincent (2) , Nathalie Zorn (3) , Emmanuelle Leize-Wagner (3) , Marion Jean (4) , Nicolas Vanthuyne (4)

1 ICMUB - Institut de Chimie Moléculaire de l'Université de Bourgogne [Dijon]
2 Institut de Chimie de Strasbourg
3 CMC - Chimie de la matière complexe
4 ISM2 - Institut des Sciences Moléculaires de Marseille

Chiral gold(I) acetylide trinuclear complexes 1 - 3 based on the cyclotribenzylene platform and terminal PR3 ligands (R = Ph, Et, and Cy, respectively), were characterized and their light emission studied. They exhibited long-lived blue phosphorescence in CHCl3 and a weak fluorescence in the UV. In MeOH/CHCl3 mixtures of > 1:1 volume ratio, 1 and 2 exhibited a new emission band at ca 540 nm that developed at the expense of the UV emission. DLS studies demonstrated the presence of molecular aggregates of Ø 30 - 80 nm. The green emission observed in MeOH-rich solvent mixtures was therefore induced by aggregation, and could originate from Au•••Au interactions. The AIE spectrum of 3 was observed only in solutions containing 99% of MeOH, and correlated with its solid state emission. The AIE profiles of the enantiomers of 1 differed from that of rac-1, suggesting that the latter is a true racemate.

Domaines: Chimie

Jing Zhang, Astrid Schaly, Jean-Claude Chambron, Bruno Vincent, Nathalie Zorn, et al.. Alkynylgold(I) C 3 -Chiral Concave Complexes: Aggregation and Luminescence. Chemistry - A European Journal, 2022, ⟨10.1002/chem.202103759⟩. ⟨hal-03852718⟩