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Product Code B1571-5g
Price £115 ex. VAT

A fluorinated aromatic bicyclic building block

Used as a synthesis intermediate for dye-sensitizing solar cells (DSSCs)


Specifications | MSDS | Literature and Reviews


2-(Difluoromethyl)benzimidazole, CAS number 705-09-9, is a fluorinated heterocyclic aromatic compound, consisting of a benzimidazole which is an imidazole fused with a benzene, and a difluoromethyl group at the 2-position. The amines in 2-(difluoromethyl)benzimidazole are nucleophilic and can easily attack an electrophilic centre in other molecules for synthesizing dyes with larger chromophores. The amines can also coordinate to a metal centre such as Cu2+ in application of DSSCs, in which charge recombination is efficiently slowed down.

The difluoromethyl substituent provides the lipophilicity to 2-(difluoromethyl)benzimidazole, improving the processability. The proton on the difluoromethyl group is more acidic than regular alkyl proton, due to the electron deficit of the two fluoro-groups on the adjacent carbon. This allows the carbon to be selectively deprotonated for further functionalization.

Multiple functional groups

Multiple functional groups

For facile synthesis

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High purity 705-09-9

High purity

>98% High purity

Fluorinated building block

Fluorinated benzimidazole building block

For semiconductors, dyes, and solar cells

General Information


CAS Number 705-09-9
Chemical Formula C8H6N2F2
Full Name 2-(Difluoromethyl)-1H-benzimidazole
Molecular Weight 244.20 g/mol
Synonyms 2-(Difluoromethyl)-1H-benzomidazole
Classification / Family Benzimidazole derivatives, Heterocyclic building blocks, Fluorinated building block, Dye-sensitized solar cells (DSSCs)

Chemical Structure


2-(difluoromethyl)benzimidazole chemical structure, CAS 705-09-9, CAS
2-(Difluoromethyl)benzimidazole chemical structure, CAS 705-09-9

Product Details


Purity >98% (1H NMR)
Melting Point Tm = 155 °C – 157 °C
Appearance White to off-white powder

MSDS Documentation


2-(Difluoromethyl)benzimidazole2-(Difluoromethyl)benzimidazole MSDS Sheet

Literature and Reviews


  1. Difluoromethane as a precursor to difluoromethyl borates, J. Geri et al., Chem. Commun., 55, 5119-5122(2019); DOI: 10.1039/C9CC01565E.
  2. Heteroleptic Ru(II) cyclometalated complexes derived from benzimidazole-phenyl carbene ligands for dye-sensitized solar cells: an experimental and theoretical approach, T. Jella et al., Mater. Chem. Front., 1, 947-957(2017); DOI: 10.1039/c6qm00264a.
  3. Mild donor-π-mild acceptor (mD-π-mA) benzimidazole-based deep blue fluorophores with hybridized local and charge transfer (HLCT) excited states for OLEDs, J. Girase et al., J. Inf. Disp., 23(3), 221-234(2022); DOI:10.1080/15980316.2022.2075042.
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