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Product Code B2021-100g
Price £63 ex. VAT

A rigid biphenyl diamine building block

For the synthesis of polyimides and enamines in applications of solar cells, telecommunication applications, batteries, and separation membranes


Specifications | MSDS | Literature and Reviews


2,2'-Dimethyl[1,1'-biphenyl]-4,4'-diamine, CAS number 84-67-3, is a biphenyl derivative with two amines and two methyl groups. 2,2'-Dimethyl[1,1'-biphenyl]-4,4'-diamine reacts with diphenylacetaldehyde catalysed by camphorsulfonic acid forming an enamine through nucleophilic substitution and dehydration reaction. The fully conjugated enamine is a p-type semiconductor used for hole transport layers (hole mobility 2.5 × 10-2 cm2/Vs) in solar cells (efficiency 18.4%).

2,2'-Dimethyl[1,1'-biphenyl]-4,4'-diamine is also used to synthesize low dielectric constant and low dielectric loss polyimides for telecommunication application with fast transport speed and low signal loss. The low dielectric property is achieved by the branched methyl groups enlarging the intermolecular spacing, hence the effective number of dipole moments is reduced.

General Information


CAS Number 84-67-3
Chemical Formula C14H16N2
Full Name 2,2'-Dimethyl[1,1'-biphenyl]-4,4'-diamine
Molecular Weight 212.29 g/mol
Synonyms m-Tolidine, 2,2'-Dimethylbenzidine, 4,4'-Diamino-2,2'-dimethylbiphenyl, 4-(4-Amino-2-methylphenyl)-3-methylbenzenamine
Classification / Family Diamine building block, Solar cells, Hole transport, Polyimides, Sensors, Telecommunication

Chemical Structure


2,2'-Dimethyl[1,1'-biphenyl]-4,4'-diamine chemical structure, CAS 84-67-3
2,2'-Dimethyl[1,1'-biphenyl]-4,4'-diamine chemical structure, CAS 84-67-3

Product Details


Purity >99%
Melting Point Tm = 106 °C
Appearance White to off-white powder

MSDS Documentation


2,2'-Dimethyl[1,1'-biphenyl]-4,4'-diamine2,2'-Dimethyl[1,1'-biphenyl]-4,4'-diamine MSDS Sheet

Literature and Reviews


  1. Enamine-based hole transporting materials for vacuum-deposited perovskite solar cell, M. Steponaitis et al., Sustainable Energy Fuels, 4, 5017-5023(2020); DOI: 10.1039/D0SE00728E.
  2. Intrinsic low-dielectric constant and low-dielectric loss aliphatic-aromatic copolyimides: The effect of chemical structure, J. Lee et al., Mater. Today Commun., 33, 104479(2022); DOI: 10.1016/j.mtcomm.2022.104479.
  3. Orientation control of the microphase-separated nanostructures of block copolymers on polyimides substrates, H. Maeda et al., J. Photopolym. Sci. Technol., 34(5), 439-448(2021); DOI: 10.2494/photopolymer.34.439.
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