2,2'-Dimethyl-[1,1'-biphenyl]-4,4'-Diamine (M-Tolidine) CAS 84-67-3

Synonyms: 2,2'-Dimethylbenzidine; 4,4'-Diamino-2,2'-dimethylbiphenyl; 2,2'-DIMETHYL-4,4'-DIAMINOBIPHENYL; 4-(4-Amino-2-methylphenyl)-3-methylbenzenamine; APB-144; 4'-amino-2,2'-dimethyl[1,1'-biphenyl]-4-ylamine

Shandong Aure Chemical Co., Ltd. is one of the leading suppliers of M-Tolidine in China and also one of the manufacturers of this product.

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Product Details

High-Purity M-Tolidine from Aure Chemical – Your Trusted Source

2,2'-Dimethyl-[1,1'-biphenyl]-4,4'-Diamine (M-Tolidine), CAS 84-67-3, is a rigid biphenyl diamine monomer and aromatic derivative, valued for its chemical stability, structural rigidity, and reactivity in polymer synthesis and organic intermediates.

Basic Information of M-Tolidine

Product Name	2,2'-Dimethyl-[1,1'-biphenyl]-4,4'-Diamine
Abbreviation	M-Tolidine
CAS Number	84-67-3
Molecular Formula	C14H16N2
Molecular Weight	212.29 g/mol
Appearance	White to off-white solid
Purity	≥99.5%
Package	1kg/bottle, 20kg/drum, or customized
Molecular formula

Key Properties

Rigid biphenyl core with methyl substituents to increase free volume and lower dielectric constant
Suitable as monomer in low-k / low dielectric loss polymer systems
Used as building block / ligand in COFs / MOFs and organic electronic materials
Dual amine functionality enables polymer chain extension or crosslinking
Reasonable thermal stability for polymer synthesis

Key Applications of M-Tolidine

High-Performance Polymers: Serves as a building block for synthesizing low-dielectric-constant polyimides and copolyimides with reduced dipole moments, ideal for telecommunication applications requiring fast signal transport and low loss; also used in block copolymers for microphase-separated nanostructures.

Optoelectronics and Solar Cells: Reacts to form conjugated enamines as p-type semiconductors for hole transport layers in vacuum-deposited perovskite solar cells, achieving high hole mobility (2.5 × 10⁻² cm²/Vs) and efficiencies up to 18.4%.

Dyes and Pigments: Acts as an aromatic diamine intermediate for producing dyes and pigments, offering strong color yield and chemical stability.

Semiconductor Devices and Cured Films: Employed as a reagent in manufacturing cured films and semiconductor devices, leveraging its diamine functionality for material processing.

Advanced Materials: Utilized as a biphenyl ligand in covalent organic frameworks (COFs) and metal-organic frameworks (MOFs) for cross-linked networks; also applied in batteries and separation membranes.

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