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Product Code B2001-LT-25g
Price £76 ex. VAT

A fluorinated diamine building block

For the synthesis of polyimides and polyimines in application of MOFs, COFs, solar cells, high-performance polymers, photonics


Specifications | MSDS | Literature and Reviews


2,2'-Bis(trifluoromethyl)benzidine (TFMB), CAS number 341-58-2, a fluorinated benzidine derivative, has two trifluoromethyl substituents at 2 and 2'-position. 2,2'-Bis(trifluoromethyl)benzidine is rigid and aromatic, which is desired for synthesizing high surface area metal organic frameworks (MOFs) and covalent organic frameworks (COFs). Owing to its rigidity, the polyimides containing the repeating units of TFMB have high thermal resistance and low linear thermal expansion coefficient (23.4 × 10−6/K from 50 to 250 °C). The two fluoromethyl groups have strong electron withdrawing effect, reducing the electron delocalization of the π orbital on the fully conjugated polymer backbone. This effect leads to significantly more transparent polyimide films compared to those with methyl substituents.

Due to the high transparency, the polyimides are used for solar cell encapsulation with MOFs cluster light diffusers (6.6% enhancement in power conversion efficiency). Flexible solar cells supported by these mechanically robust polyimide substrates maintain 97% initial efficiency after 5000 bending cycles.

Multiple functional groups

Multiple functional groups

For facile synthesis

Fluorinated building block

Fluorinated diamine building block

For polyimides, COFs, and solar cells

Worldwide shipping for 341-58-2

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High purity 341-58-2

High purity

>99% High purity

General Information


CAS Number 341-58-2
Chemical Formula C14H10F6N2
Full Name 2,2'-Bis(trifluoromethyl)benzidine
Molecular Weight 320.24 g/mol
Synonyms 4,4'-diamino-2,2'-bis(trifluoromethyl)biphenyl,2,2'-bis(trifluoromethyl)-[1,1'-biphenyl]-4,4'-diamine, 4-[4-amino-2-(trifluoromethyl)phenyl]-3-(trifluoromethyl)aniline
Classification / Family Fluorinated building blocks, Diamine building blocks, Benzidine derivatives, Solar cells, High performance polymers, MOFs, COFs

Chemical Structure


2,2'-Bis(trifluoromethyl)benzidine (TFMB) chemical structure, CAS 341-58-2
2,2'-Bis(trifluoromethyl)benzidine (TFMB) chemical structure, CAS 341-58-2

Product Details


Purity >99%
Melting Point Tm = 183 °C – 184 °C
Appearance White to pale yellow powder/crystal

MSDS Documentation


2,2'-Bis(trifluoromethyl)benzidine (TFMB)2,2'-Bis(trifluoromethyl)benzidine (TFMB) MSDS Sheet

Literature and Reviews


  1. Copolyimides for gradient-index optics, A Rosenburg et al., Opt. Mater. Express, 12(10), 4133-4146(2022); DOI: 10.1364/OME.460831.
  2. Design of imide oligomer-mediated MOF clusters for solar cell encapsulation systems by interface fusion strategy, M. Wu et al., Adv. Sci., 2260748 (2023); DOI: 10.1002/advs.202206748.
  3. Mechanical-robust and recyclable polyimide substrates coordinated with cyclic Ti-oxo cluster for flexible organic solar cells, G. Zhang et al., DOI: 10.1038/s41528-022-00166-8.
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