Chemical Identity and Molecular Structure

Bis[2-(4,6-difluorophenyl)pyridinato-C2,N](picolinato)iridium(III), commonly abbreviated as FIrpic or Ir(dfppy)₂(pic), is a heteroleptic octahedral iridium(III) complex. It features two identical cyclometalating 2-(4,6-difluorophenyl)pyridine (dfppy) ligands coordinated through a carbon–iridium bond at C2 of the fluorinated phenyl ring and the pyridine nitrogen (C^N coordination mode). The third, ancillary ligand is picolinic acid (pyridine-2-carboxylic acid), which coordinates through its pyridyl nitrogen and carboxylate oxygen (N^O coordination mode).

The two fluorine substituents at the 4- and 6-positions of the phenyl ring exert a strong electron-withdrawing inductive effect. This lowers the energy of the metal-centred d orbitals and raises the ligand π* levels, collectively blue-shifting the emission relative to the non-fluorinated parent compound fac-Ir(ppy)₃. The picolinate ancillary ligand introduces an asymmetric coordination environment and is credited with improving the photostability and thermal stability of the complex compared with analogues bearing labile β-diketonate ancillary ligands.

Photophysical Properties and Emission Characteristics

FIrpic is one of the benchmark blue-to-blue-green phosphorescent emitters in organic electronics research. Its photoluminescence originates predominantly from a triplet metal-to-ligand charge-transfer (³MLCT) excited state mixed with ligand-centred (³LC) character, a combination that is typical of strongly cyclometalated iridium complexes.

Key photophysical characteristics include a relatively short phosphorescence lifetime in the microsecond range and a high photoluminescence quantum yield in deoxygenated solution, making it efficient for triplet-harvesting applications in electroluminescent devices. The emission maximum is typically observed in the blue-green region of the visible spectrum. The large spin–orbit coupling provided by the heavy iridium centre facilitates efficient intersystem crossing from the singlet excited state to the emissive triplet manifold, enabling near-unity triplet quantum yields.

Note for users: The exact emission maximum, quantum yield, and lifetime values can vary with the solvent, host matrix, concentration, and measurement conditions. Users should consult primary literature or perform in-house characterisation under their specific experimental conditions. Aladdin Scientific provides purity specifications with each lot; verify the certificate of analysis (CoA) before use.

Applications in OLED and Photophysics Research

FIrpic (B121602) is extensively employed as a phosphorescent dopant emitter in the emissive layer of blue and white phosphorescent OLEDs (PhOLEDs). In device architectures, it is typically co-deposited or solution-processed into a wide-bandgap host material. Suitable host materials must satisfy key energetic requirements: the triplet energy (T₁) of the host must exceed that of FIrpic to prevent back-energy-transfer and quenching of the emitter. Commonly reported host classes include carbazole-based small molecules and polymers, and various bipolar host architectures.

Beyond OLEDs, FIrpic is used in:

• Photophysical benchmarking: as a reference emitter for calibrating photoluminescence quantum yield measurements and phosphorescence lifetime instrumentation.
• Photocatalysis: as a visible-light photoredox catalyst or photosensitiser, leveraging its long-lived triplet excited state and suitable redox potentials.
• Biological and sensing applications: exploratory use in oxygen sensing, given the sensitivity of its phosphorescence lifetime to molecular oxygen (quenching).
• Fundamental organometallic studies: as a model compound for understanding structure–property relationships in cyclometalated iridium(III) complexes.

Handling, Storage, and Safety Guidelines

As with all organometallic iridium(III) compounds, appropriate precautions should be taken when handling FIrpic (B121602). The following guidelines represent general best practice for this class of material; always consult the current Safety Data Sheet (SDS) provided by Aladdin Scientific before use.

• Storage: Store in a cool, dry, well-ventilated location away from light and moisture. Seal tightly after each use to prevent moisture ingress and photodegradation. Refrigerated storage (2–8 °C) is commonly recommended for long-term preservation of phosphorescent iridium complexes, but confirm with the product-specific CoA.
• Light sensitivity: FIrpic and related iridium complexes can undergo photodegradation upon prolonged exposure to intense light. Handle and store in amber or foil-wrapped vials where possible.
• Handling: Use appropriate personal protective equipment (PPE) including nitrile gloves, laboratory coat, and safety glasses. Avoid inhalation of dust or aerosols if handling solid material. Work in a well-ventilated area or fume hood.
• Solubility: FIrpic is soluble in common organic solvents such as dichloromethane, chloroform, tetrahydrofuran, and dimethyl sulfoxide. It has limited solubility in non-polar solvents and water.
• Stability: The complex is generally stable under ambient conditions for short durations, but prolonged exposure to air and moisture may result in gradual degradation. Deoxygenate solutions for photophysical measurements requiring highest accuracy.

For specific hazard classifications, first-aid measures, and disposal requirements, refer to the current SDS available on the Aladdin Scientific product page for B121602.

Quality Specifications and Ordering Information

Aladdin Scientific supplies Bis[2-(4,6-difluorophenyl)pyridinato-C2,N](picolinato)iridium(III) under SKU B121602. Each lot is accompanied by a Certificate of Analysis (CoA) detailing the purity and characterisation data. Researchers are strongly advised to:

• Download and review the CoA for the specific lot number received before initiating experiments.
• Confirm that purity specifications meet the requirements of the intended application (e.g., OLED device fabrication typically demands high-purity material).
• Contact Aladdin Scientific technical support for bulk quantities, custom specifications, or additional analytical data.

For procurement, pricing, and availability, visit the Aladdin Scientific website or contact your regional sales representative. Volume discounts and institutional pricing may be available.