title: Room-temperature combinatorial screening of cyclometallated iridium(III) complexes for a step towards molecular control of colour purity.
abstract: A library of emission spectra of 90 bis-cyclometallated iridium complexes has been obtained using a simple combinatorial approach performed at room temperature. Trends in emission maxima are rationalized using Hammett parameters and invoking inter ligand energy transfer (ILET) processes. The screening approach allowed us to observe trends in the broadness of emission spectra opening the way for a rational approach to the engineering of the emission colour purity at a molecular level. Finally limitations to the screening strategy are discussed using a case study that involves two different monodentate ligands.
authors.affiliation: Laboratory of Photonics and Interfaces, Swiss Federal Institute of Technology, Station 6, CH-1015, Lausanne, Switzerland. etienne.baranoff@epfl.ch
authors.forename: Etienne
authors.initials: E
authors.lastname: Baranoff
authors.forename: Il
authors.initials: I
authors.lastname: Jung
authors.forename: Rosario
authors.initials: R
authors.lastname: Scopelliti
authors.forename: Euro
authors.initials: E
authors.lastname: Solari
authors.forename: Michael
authors.initials: M
authors.lastname: Grätzel
authors.forename: Md Khaja
authors.initials: MK
authors.lastname: Nazeeruddin
mesh_terms: D003116:Color; D020650:Combinatorial Chemistry Techniques / Q000379:methods*; D007495:Iridium / Q000737:chemistry*; D008958:Models, Molecular; D008968:Molecular Conformation; D009942:Organometallic Compounds / Q000737:chemistry*; D054852:Small Molecule Libraries / Q000737:chemistry; D013057:Spectrum Analysis; D013696:Temperature
chemical_list: D009942:Organometallic Compounds; D054852:Small Molecule Libraries; D007495:Iridium