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Diphenic acid is an organic compound with the chemical formula C14H10O4 and CAS 482-05-3. It is a white or slightly yellow powder, sometimes in the form of flakes or crystals. Acids are slightly soluble in water, but easily soluble in organic solvents such as ethanol, ether, and acetone. It is an organic acid with acidity that can react with bases to form salts.
It is an important pharmaceutical intermediate. Phanthroline can also be used to construct Sm coordination polymers. Phanthroline is a high-performance magnetic porous material with potential value in fluorescence probes. The synthesis of biphenyl acid may be harmful to the environment, and special attention should be paid to water bodies. It can also be used to produce other types of polymers. For example, reacting with phenylenediamine can yield polyamide. Polyamide has high strength and heat resistance, and is widely used in the manufacturing of high-performance fibers, engineering plastics, and coatings.
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C.F |
C14H10O4 |
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E.M |
242 |
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M.W |
242 |
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m/z |
242 (100.0%), 243 (15.1%), 244 (1.1%) |
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E.A |
C, 69.42; H, 4.16; O, 26.42 |
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Morphological |
Crystal or crystal powder |
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Color |
red brown |
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M.P |
227-229 ° C (lit.) |
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B.P |
345.05 ° C (rough estimate) |
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Density |
1.2695 (rough estimate) |
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S.C |
store below + 30 ° C |
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S.A |
solublesoluble 40 parts of solvent |
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Acidity coefficient ( pKa ) |
PKA 3.20 (H2O t = 23.0) (uncertain) |
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V.D |
5.21 (vs air) |
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Synthesis Methods
► Traditional Synthesis Routes
Historically, diphenic acid has been synthesized through several methods, including the oxidation of biphenyl derivatives and the coupling of benzoic acid derivatives. One common approach involves the oxidation of biphenyl using strong oxidizing agents such as potassium permanganate (KMnO₄) or chromic acid (H₂CrO₄). This method, while effective, often requires harsh reaction conditions and generates significant amounts of waste, making it less environmentally friendly.
Another traditional method involves the coupling of two benzoic acid molecules through a condensation reaction. This approach typically requires the use of dehydrating agents and high temperatures, leading to moderate yields and the formation of by-products. Despite these limitations, traditional synthesis routes remain widely used due to their simplicity and cost-effectiveness.
► Modern Synthesis Techniques
In recent years, researchers have developed more efficient and sustainable synthesis methods for 2,2 '- biphenyldicarboxylic acid. One notable approach involves the use of transition metal catalysts to facilitate the coupling of aromatic carboxylic acids. For example, a method utilizing copper(I) iodide (CuI) as a catalyst, in the presence of piperazine and potassium hydroxide (KOH), has been reported for the synthesis of 4,4'-diphenic acid. This reductive coupling method offers several advantages, including mild reaction conditions, high yields, and simple purification procedures. The use of polyethylene glycol 400 as a high-boiling, environmentally friendly solvent further enhances the sustainability of this approach.
Another modern synthesis technique involves the electrochemical oxidation of biphenyl derivatives. This method leverages the selectivity and efficiency of electrochemical processes to produce 2,2 '- biphenyldicarboxylic acid with high purity and yield. Electrochemical synthesis offers the potential for reduced waste generation and lower energy consumption compared to traditional methods, making it an attractive option for large-scale production.
Diphenic Acid (2,2 '- biphenyldicarboxylic acid), abbreviated as biphenyldicarboxylic acid, is a rigid aromatic dicarboxylic acid composed of two benzene rings connected by a 2,2' - carbon bond, with one carboxyl group at each end. It is a white crystalline powder at room temperature and has core characteristics such as high thermal stability, chemical corrosion resistance, rigid molecular structure, strong coordination ability, and easy derivatization. As an important functional monomer of biphenyl, biphenyldicarboxylic acid can undergo various reactions such as esterification, acylation, cyclization, coordination, and polymerization due to its unique molecular configuration and reactivity with dicarboxylate groups. It is widely used in eight core fields, including polymer material synthesis and modification, pharmaceutical intermediates, dyes and pigments, industrial additives, metal coordination chemistry, liquid crystal materials, biological activity research, and fine chemical synthesis. It is a key raw material for high-performance polymers, special coatings, pharmaceuticals, dyes, and coordination materials.
Application of polymer material synthesis and modification: synthesis of high-performance polyester/polyamide, modification of engineering plastics, special coating resins, fiber modification, plasticizer
The core and largest usage of 2,2 '- biphenyldicarboxylic acid is in the synthesis and modification of polymer materials. As a rigid aromatic dicarboxylic acid monomer, it replaces traditional phthalic acid and terephthalic acid, and polymerizes with polyols and polyamines to prepare high-performance polymer materials such as polyester, polyamide, polyimide, epoxy resin, etc; As a modifier, it is a key functional monomer in the field of high-performance polymer materials that enhances the heat resistance, weather resistance, mechanical strength, chemical stability, and processability of engineering plastics, special coatings, synthetic fibers, and plasticizers.
Rigid molecular structure: biphenyl ring rigid skeleton, polymerized to form high rigidity polymer chains, significantly improving material heat resistance, mechanical strength, and dimensional stability;
Bicarboxyl high reactivity: The carboxyl groups at both ends are symmetrically distributed, making it easy to undergo condensation reactions with hydroxyl and amino groups. The polymerization efficiency is high, the product molecular weight is high, and the structure is regular;
High thermal stability: The biphenyl ring structure is resistant to high temperatures, with a decomposition temperature of ≥ 350 ℃, and is suitable for high-temperature polymerization and processing technology;
Chemical corrosion resistance: The aromatic ring structure is resistant to acid and alkali, organic solvents, and hydrolysis, enhancing the weather resistance and service life of the polymer;
Strong intermolecular forces: The π - π stacking effect of biphenyl rings is strong, resulting in high crystallinity and excellent mechanical properties of the polymer.
Synthesis of High Performance Polyester (Polyterephthalate, Unsaturated Polyester, Polyester Resin)
Application value: It can replace terephthalic acid and polymerize with ethylene glycol, propylene glycol, and butanediol to prepare high heat resistance, high rigidity, and hydrolysis resistance polyester, which is used in engineering plastics, special fibers, high-end coatings, and electronic packaging materials;
Advantages of polymerization: The rigid framework of phthalic acid increases the glass transition temperature (Tg) of polyester by 30-50 ℃, the heat distortion temperature (HDT) by over 200 ℃, the tensile strength by 20-40%, and the hydrolysis resistance by 50%, which is significantly better than traditional PET and PBT polyesters;
Application scenarios: automotive engine components, electronic and electrical casings, high-temperature resistant food packaging, industrial pipelines, optical lens substrates.
Synthesis of High Performance Polyamide (Nylon) (Transparent Nylon, High Temperature Resistant Nylon, High Strength Nylon)
Application value: polymerize with hexamethylenediamine and decanediamine to prepare transparent, high temperature resistant, and high toughness polyamide, solving the problems of high water absorption, poor heat resistance, and easy yellowing of traditional nylon;
Performance improvement: The rigid structure of biphenyl ring reduces the water absorption rate of polyamide to below 1.5% (traditional nylon 6 is 3.5%), increases the Tg to 120-150 ℃, and achieves transparency of over 90%, combining high strength, high toughness, and weather resistance;
Application scenarios: high-end food packaging, medical device casings, optical components, automotive interiors, electronic connectors.
Synthesis of Polyimide (PI) (High temperature resistant PI film, PI resin, electronic grade PI)
Application value: polymerize with dianhydride monomers to prepare high heat resistance, high insulation, and high rigidity polyimides, which are used in aerospace, electronic semiconductors, flexible circuits, and high-temperature insulation materials;
Core advantages: The thermal decomposition temperature of biphenyldicarboxylic acid based PI is ≥ 550 ℃, and the long-term use temperature is above 300 ℃. It has low dielectric constant, good insulation, high mechanical strength, radiation resistance, and better performance than traditional benzene based PI;
Application scenarios: Flexible Printed Circuit Board (FPC), Aerospace Insulation Layer, Semiconductor Packaging Film, High Temperature Resistant Tape, Lithium Battery Diaphragm Coating.
Engineering Plastic Modifiers (PC, ABS, PBT, PET Modification)
Application value: As a rigid toughening modifier, it can be added to engineering plastics such as PC, ABS, PBT, PET, etc. to enhance heat resistance, rigidity, dimensional stability, weather resistance, and impact resistance;
Modification effect: Addition amount of 3-8%, PC/ABS alloy hot deformation temperature increased by 15-25 ℃, tensile strength increased by 10-20%, notch impact strength increased by 30-50%, UV aging resistance, less prone to yellowing;
Application scenarios: automotive exterior parts, home appliance casings, electronic components, outdoor products, high-end furniture.
Special coatings and resins (high-temperature resistant coatings, anti-corrosion coatings, powder coatings, water-based resins)
Application value: As a film-forming resin monomer, it can be used to prepare high-temperature, corrosion-resistant, and weather resistant special coatings for industrial equipment, pipelines, ships, steel structures, and high-temperature components;
Coating performance: Biphenyldicarboxylic acid based coating can withstand high temperatures of 250-300 ℃, acid and alkali resistance, salt spray resistance, organic solvent resistance, strong adhesion, high hardness, and is not easy to peel off. Its service life is extended by 2-3 times;
Application scenarios: High temperature chimney anti-corrosion, chemical equipment lining, ship deck coating, automotive high-temperature resistant topcoat, steel structure anti rust paint.
Synthetic fiber modification (polyester fiber, nylon fiber, high temperature resistant fiber)
Application value: As a fiber modifier, it can be added to polyester and nylon spinning melts to enhance fiber heat resistance, rigidity, anti pilling, dimensional stability, and dyeing performance;
Modification effect: The addition amount is 1-5%, the heat-resistant temperature of polyester fiber is increased by 20-30 ℃, the anti pilling level is increased by 1-2 levels, the dimensional stability is increased by 40%, and the dyeing uniformity is improved;
Application scenarios: high-end clothing fabrics, industrial filter cloth, automotive interior fibers, high-temperature resistant sewing thread, decorative fabrics.
Special plasticizers (high-temperature resistant plasticizers, migration resistant plasticizers, environmentally friendly plasticizers)
Application value: Esterification with alcohols to produce phthalate plasticizers, replacing phthalates (DOP, DBP), with high temperature resistance, migration resistance, environmental friendliness, non toxicity, and high plasticizing efficiency;
Plasticization advantages: Biphenyldicarboxylate has a heat resistance temperature of up to 200 ℃, is not easy to migrate, volatile, and can be extracted. It complies with EU REACH and US FDA environmental standards, is non-toxic, and has no carcinogenic risk;
Application scenarios: PVC, rubber, polyurethane, epoxy resin plasticization, used for food packaging, medical equipment, children's toys, automotive interiors, high-end wires and cables.
Reference Information Sources:
- Huayuan Network two thousand and twenty-five 2,2 '- Biphenyldicarboxylic acid_SSDS_ Application (Core Characteristics of Polymer Synthesis)
- Gaide Chemical Network two thousand and twenty-five 2,2 '- Biphenyldicarboxylic Acid_Application of Polymer Materials (Polyester/Polyamide Synthesis)
- China Plastics Industry Association two thousand and twenty-four Report on High Performance Engineering Plastic Modification Technology (Engineering Plastic Modification Effect)
- Journal of Polymer Science. 2023. Diphenic Acid-Based Polymers for High-Temperature Applications( Polyimide synthesis
- Paint industry two thousand and twenty-four Research progress on special high-temperature resistant coating resins (application of special coatings)
Frequently Asked Questions
The 'bending effect' of neighboring positions determines its value
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Compared to the linearly rigid 4,4 '- biphenyldicarboxylic acid (bpdc), it is a' structural trap 'specifically designed for constructing frameworks with intrinsic pores or helical structures.
Due to the two carboxyl groups being located adjacent to each other (2,2 '), the two benzene rings must undergo twisting to alleviate steric hindrance. This "twisted" configuration prevents it from forming regular straight channels like the 4,4 'isomer, but tends to form one-dimensional helical chains, two-dimensional layered structures, or 3D/3D hybrid interpenetrating structures with "Guest" effects. In coordination chemistry, it is a specialized key used to construct "imperfect" symmetric (chiral, helical) structures.
Is its thermal stability "high" or "low"? --Nirvana Rebirth after Coordination
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Free acids melt and decompose at around 230 ° C, but after binding to the metal, the skeleton can withstand it until>400 ° C before disintegration.
Research has found that once it deprotonates and coordinates with metal ions (such as rare earth elements In and Ln) to form coordination polymers or MOF materials, its thermal decomposition temperature will soar to 315-370 ° C. Interestingly, some complexes do not show any mass loss below 320 ° C. From easily sublimated small molecules to high-temperature resistant material components, it has undergone a thermodynamic "magnificent turn".
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