Abstract
In the solvated title compound, [Ir(C12H11N2)2(C11H19O2)]·CH3CO2C2H5, the IrIII ion adopts a distorted octa-hedral coordination environment resulting from its coordination by two C,N-chelating 2,6-dimethyl-3-(pyridin-2-yl)pyridin-4-yl ligands and one O,O'-chelating 2,2,6,6-tetra-methylhepta-ne-3,5-dionate ligand. The C,N-chelating ligands are perpendicular to each other [dihedral angle between the least-squares planes = 87.86 (5)°] and are arranged in a cis-C,C' and trans-N,N' fashion. In the crystal, pairwise C-H⋯π inter-actions between inversion-related IrIII complexes are present, forming a dimeric structure. The title complex shows bright bluish-green emission with good quantum efficiency in solution at room temperature.
Highlights
In the solvated title compound, [Ir(C12H11N2)2(C11H19O2)]ÁCH3CO2C2H5, the IrIII ion adopts a distorted octahedral coordination environment resulting from its coordination by two C,N-chelating 2,6-dimethyl-3-(pyridin-2-yl)pyridin-4-yl ligands and one O,O0-chelating 2,2,6,6-tetramethylheptane-3,5-dionate ligand
IrIII complexes bearing either methoxy or isopropoxy substituents in C-coordinating pyridine show blue emission at room temperature, these substituents act as electrondonating groups (Lee et al, 2014; Kim et al, 2018b)
An IrIII complex based on methyl-substituted bipyridine as a main ligand emits strong green phosphorescence emission at room temperature (Kim et al, 2017)
Summary
Bipyridine-based iridium(III) complexes have recently attracted much attention because of their applications in organic light-emitting diodes (OLEDs) (Kim et al, 2018a; Reddy et al, 2016). Fluorinated- or alkoxofunctionalized bipyridine ligands have attracted increasing interest in materials research fields because of their large energy differences (T1!S0) between the triplet (T1) excited states and singlet ground states (Kim et al, 2017). This large triplet energy makes them useful and effective ligands for the design of blue phosphorescent metal complexes. IrIII complexes bearing either methoxy or isopropoxy substituents in C-coordinating pyridine show blue emission at room temperature, these substituents act as electrondonating groups (Lee et al, 2014; Kim et al, 2018b) This could be due to their large triplet energy (T1 = 2.70–2.82 eV). We describe the results of our investigation of the crystal structure, thermal and luminescent properties of the title solvated IrIII complex possessing methyl-substituted bipyridine, which was motivated by its potential application for OLEDs
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