Alkynylgold(I) C3-Chiral Concave Complexes: Aggregation and Luminescence |
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| Authors: | Jing Zhang Dr Astrid Schaly Dr Jean-Claude Chambron Dr Bruno Vincent Nathalie Zorn Dr Emmanuelle Leize-Wagner Marion Jean Dr Nicolas Vanthuyne |
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| Institution: | 1. Institut de Chimie de Strasbourg, UMR 7177 CNRS, Université de Strasbourg, 1, rue Blaise Pascal, BP 296 R8, 67008 Strasbourg, France;2. Institut de Chimie Moléculaire de l'Université de Bourgogne, UMR 6302 CNRS, Université Bourgogne Franche-Comté, 9, avenue Alain Savary, 21078 Dijon, France;3. Chimie de la Matière Complexe, UMR 7140 CNRS, Université de Strasbourg, 4, rue Blaise Pascal, 67070 Strasbourg, France;4. Aix Marseille Univ, CNRS Centrale Marseille, iSm2, Marseille, France |
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| Abstract: | 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. |
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| Keywords: | aggregation alkyne ligands chirality gold luminescence |
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