Ossila 4-Fluoro-1H-indazole B1501

4-Fluoro-1H-indazole, also called 4-fluoroindazole (CAS 341-23-1), is a fluorinated heterocyclic aromatic building block supplied at >98% purity (1H NMR). Its structure is a pyrazole ring fused to a benzene ring, carrying a fluorine substituent at the 4-position. It serves as an intermediate for making semiconducting small molecules and polymers used in OLEDs and OPVs.

The compound acts as a strong chromophore unit, and further functional groups can be introduced through nucleophilic aromatic substitution. Because indazole is highly conjugated, it is also relevant to dye-sensitized solar cells (DSSCs). The pyrazole moiety allows coordination to metal centres such as Ir, Ln and Eu, giving heteroleptic or homoleptic triplet photosensitizers with efficient ligand-to-metal energy transfer.

The electron-deficient fluorine group offers a way to tune the energy gap of the resulting molecule or complex, and the fluorinated indazole supports intermolecular interactions including π−π stacking and H−F hydrogen/halogen bonding. Pyrazoles and indazoles are also widely used in the pharmaceutical industry for their range of biological activities. It is supplied as a yellow-green powder or crystals.

• Synthesis of semiconducting molecules and polymers for OLEDs and OPVs.
• Preparation of dyes for dye-sensitized solar cells (DSSCs).
• Ligand for Ir, Ln or Eu complexes forming triplet photosensitizers.
• Energy-gap tuning of molecules and metal complexes through the fluorine substituent.
• Building block for further functionalisation via nucleophilic aromatic substitution.

• Product code: B1501
• M​olecular Weight: 136.13 g/mol
• Synonyms: 4-Fluoroindazole
• Melting Point: 130 °C - 134 °C
• Classification / Family: Indazole derivatives, Fluorinated building blocks, Heterocyclic building blocks, Dyes, Semiconductor synthesis intermediates, OPVs

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