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

Authors :: Zhang J
Schaly A
Chambron JC
Vincent B
Zorn N
Leize-Wagner E
Jean M
Vanthuyne N
Source :: Chemistry (Weinheim an der Bergstrasse, Germany) [Chemistry] 2022 Feb 01; Vol. 28 (7), pp. e202103759. Date of Electronic Publication: 2021 Dec 27.
Publication Year :: 2022
Abstract: Chiral gold(I) acetylide trinuclear complexes 1-3 based on the cyclotribenzylene platform and terminal PR <subscript>3</subscript> ligands (R=Ph, Et, and Cy, respectively), were characterized and their light emission studied. They exhibited long-lived blue phosphorescence in CHCl <subscript>3</subscript> and a weak fluorescence in the UV. In MeOH/CHCl <subscript>3</subscript> 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.<br /> (© 2021 Wiley-VCH GmbH.)