Bimetallic Gold(I) Complexes with Ethynyl-Helicene and Bis-Phosphole Ligands: Understanding the Role of Aurophilic Interactions in their Chiroptical Properties

Mehdi El sayed moussa (1) , Hui Chen (2) , Zuoyong Wang (2) , Monika Srebro-Hooper (3) , Nicolas Vanthuyne (4) , Soizic Chevance (1) , Christian Roussel (4) , J. A. Gareth Williams (5) , Jochen Autschbach (6) , Régis Réau (1) , Zheng Duan (2) , Christophe Lescop (1) , Jeanne Crassous (1)

1 ISCR - Institut des Sciences Chimiques de Rennes
2 International Phosphorus Laboratory, Chemistry Department Zhengzhou University
3 UJ - Uniwersytet Jagielloński w Krakowie = Jagiellonian University
4 ISM2 - Institut des Sciences Moléculaires de Marseille
5 Department of Chemistry [Durham, UK]
6 Department of Chemistry [Buffalo]

Monometallic gold(I)-alkynyl-helicene complexes (1a,b,) and bimetallic gold(I)-alkynyl-helicene architectures featuring the presence (2a,b) or absence (3a,b) of aurophillic intramolecular interactions were prepared by using different types of phosphole ligands (mono-phosphole L1 or bis-phospholes L2,3). The influence of the Au(I) d10-metal center(s) on the electronic, photophysical and chiroptical properties of these unprecedented phosphole-gold(I)-alkynyl-helicene complexes were examined. Experimental and theoretical results highlight the importance of ligand-to-ligand-type charge transfers and the strong effect of presence or absence of Au(I)-Au(I) interactions in 2a,b.

Keywords: circular dichroism; aurophilic interactions; gold; helicenes; phospholes

Domains: Chemical Sciences; Organic chemistry; Chemical Sciences; Coordination chemistry

Mehdi El sayed moussa, Hui Chen, Zuoyong Wang, Monika Srebro-Hooper, Nicolas Vanthuyne, et al.. Bimetallic Gold(I) Complexes with Ethynyl-Helicene and Bis-Phosphole Ligands: Understanding the Role of Aurophilic Interactions in their Chiroptical Properties. Chemistry - A European Journal, 2016, 22 (17), pp.6075-6086. ⟨10.1002/chem.201600126⟩. ⟨hal-01292929⟩