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Bis-(μ)-chlorotetrakis(2-(4,6-difluoromethylphenyl)-pyridinato-C2,N)diiridium(III) (0.09 mmol, 0.13 g) was heated to reflux with 4,4’-di-tert-butyl-2,2’-dipyridyl (0.20 mmol, 0.054g) in ethylene glycol (6.0 mL) under nitrogen with constant stirring for 15h. Upon cooling to room temperature, the mixture was transferred to a separatory funnel with water (60 mL) and washed with hexanes (3×30 mL). The aqueous layer was heated to 85 °C for 5 min to remove residual hexanes. A 10 mL aqueous ammonium hexafluorophosphate solution (1.0g in 10 mL deionized water) was added to the reaction mixture, producing a yellow-green amorphous powder. This precipitate was filtered, dried, and recrystallized by acetone:pentane vapor diffusion, giving the pure product, [Ir(dF(CF3)ppy)2(dtbbpy)]-(PF6). Yield: 0.15 g (75percent).
121 mg
Stage #1: at 150℃; for 15 h; Inert atmosphere
General procedure: Heteroleptic iridium 4xy were synthesized in a two-step procedure[42,43]. In the first step, chloro-bridged dimer was synthesized by charging a two-necked reaction flask with magnetic stir bar, iridium(III) chloride (1 equiv), ligand (2.26 equiv), and a 2:1 v:v mixture of 2-methoxyethanol/water. The mixture was degased with Ar (via Ar bubbling) and heated under reflux at 120 °C with constant stirring overnight. The reaction mixture cooled to room temperature and filtered. The precipitate was washed with water (3x10 mL), dried in air and taken onto the second step without further purification unless noted. In the second step, the chloro bridging dimer (1 equiv), bipyridyl ligand (2.2 equiv) and ethylene glycol were placed in a two-necked flask and then flushed with Ar. The mixture was heated at 150 °C for 15 h and then cooled. The cooled reaction mixture was washed hexane (3 10 mL) and mixture was heated to 85 °C for 5 min to remove residual hexane. Aqueous ammonium hexafluorophosphate (sat. solution) was added to the reaction mixture causing the iridium-PF6 salt to precipitate,which was filtered, dried and recrystallized (acetone/ether).
Reference:
[1] Journal of Organic Chemistry, 2015, vol. 80, # 15, p. 7642 - 7651
[2] Tetrahedron Letters, 2018, vol. 59, # 21, p. 2046 - 2049
[3] Journal of Organometallic Chemistry, 2015, vol. 776, p. 51 - 59
2
[ 17084-13-8 ]
[ 870987-64-7 ]
[ 72914-19-3 ]
[ 870987-63-6 ]
Reference:
[1] Organic Letters, 2018,
3
[ 387827-64-7 ]
[ 72914-19-3 ]
[ 870987-63-6 ]
Reference:
[1] Chemistry - A European Journal, 2018, vol. 24, # 44, p. 11314 - 11318
Bis-(mu)-chlorotetrakis(2-(4,6-difluoromethylphenyl)-pyridinato-C2,N)diiridium(III) (0.09 mmol, 0.13 g) was heated to reflux with 4,4?-di-tert-butyl-2,2?-dipyridyl (0.20 mmol, 0.054g) in ethylene glycol (6.0 mL) under nitrogen with constant stirring for 15h. Upon cooling to room temperature, the mixture was transferred to a separatory funnel with water (60 mL) and washed with hexanes (3×30 mL). The aqueous layer was heated to 85 C for 5 min to remove residual hexanes. A 10 mL aqueous ammonium hexafluorophosphate solution (1.0g in 10 mL deionized water) was added to the reaction mixture, producing a yellow-green amorphous powder. This precipitate was filtered, dried, and recrystallized by acetone:pentane vapor diffusion, giving the pure product, [Ir(dF(CF3)ppy)2(<strong>[72914-19-3]dtbbpy</strong>)]-(PF6). Yield: 0.15 g (75%).
121 mg
General procedure: Heteroleptic iridium 4xy were synthesized in a two-step procedure[42,43]. In the first step, chloro-bridged dimer was synthesized by charging a two-necked reaction flask with magnetic stir bar, iridium(III) chloride (1 equiv), ligand (2.26 equiv), and a 2:1 v:v mixture of 2-methoxyethanol/water. The mixture was degased with Ar (via Ar bubbling) and heated under reflux at 120 C with constant stirring overnight. The reaction mixture cooled to room temperature and filtered. The precipitate was washed with water (3x10 mL), dried in air and taken onto the second step without further purification unless noted. In the second step, the chloro bridging dimer (1 equiv), bipyridyl ligand (2.2 equiv) and ethylene glycol were placed in a two-necked flask and then flushed with Ar. The mixture was heated at 150 C for 15 h and then cooled. The cooled reaction mixture was washed hexane (3 10 mL) and mixture was heated to 85 C for 5 min to remove residual hexane. Aqueous ammonium hexafluorophosphate (sat. solution) was added to the reaction mixture causing the iridium-PF6 salt to precipitate,which was filtered, dried and recrystallized (acetone/ether).
Heteroleptic iridium complex Ir1 was synthesized in a two-step procedure. In the first step, chloro-bridged dimer was synthesized by charging a two-necked reaction flask with magnetic stirbar, iridium (III) chloride (1 equiv), ligand (2.26 equiv), and a 2:1 v:v mixture of 2-methoxyethanol/water. The mixture was degassed with Ar and heated under reflux at 120C overnight. The reaction mixture was then cooled to room temperature and filtered. The precipitate was washed with water, dried under vacuum and taken to the second step without further purification. In the second step, the chloro bridging dimer (1 equiv), bipyridyl ligand (2.2 equiv) and ethylene glycol were placed in a two-necked flask and then flushed with Argon. The mixture was heated at 150C for 24 h and then cooled. The cooled reaction mixture was washed hexane and heated to 85C for 5 min to remove the residual hexane and aqueous ammonium hexafluorophosphate (2g for each 100 mg IrCl3) was added to the reaction mixture causing the iridium-PF6 salt to precipitate, which was filtered, purified on silica column using DCM/Hexane as eluent dried under vacuum for 6h and the Ir1 complex was isolated as yellow solid (74% yield).