1,4-Naphthalenedicarboxylic Acid CAS 605-70-9: Properties, Uses and Applications

1,4-Naphthalenedicarboxylic Acid, also known as naphthalene-1,4-dicarboxylic acid or 1,4-naphthalic acid, is an aromatic dicarboxylic acid with the CAS number 605-70-9. It contains a rigid naphthalene ring and two carboxylic acid groups, giving it properties that make it useful as an organic synthesis intermediate and as a building block for polymer and advanced material development. Its molecular formula is C₁₂H₈O₄, with a molecular weight of 216.19 g/mol.

Unlike simple aromatic acids used mainly for routine chemical synthesis, 1,4-Naphthalenedicarboxylic Acid is relevant to several downstream applications, including high-performance polymers, polyester materials, dyes, coatings, and coordination materials. Understanding its basic properties and application areas can help determine whether it is appropriate for a particular synthesis or material-development process.

What Is 1,4-Naphthalenedicarboxylic Acid?

1,4-Naphthalenedicarboxylic Acid is an aromatic compound in which two carboxylic acid groups are attached to a naphthalene ring. The rigid aromatic structure distinguishes it from more flexible aliphatic dicarboxylic acids and contributes to its value in material-related chemistry.

The compound is generally described as a solid or crystalline powder. Published chemical databases report a melting point above 300 °C and describe it as insoluble in water. Its high thermal transition temperature and low water solubility are important characteristics to consider when designing handling, reaction, and purification processes.

The exact position of the two carboxyl groups is also important. 1,4-Naphthalenedicarboxylic Acid should not automatically be treated as interchangeable with other naphthalenedicarboxylic acid positional isomers, because changing the substitution pattern changes molecular geometry and can affect downstream reaction or coordination behavior.

Key Properties of 1,4-Naphthalenedicarboxylic Acid

For practical chemical evaluation, several basic parameters are particularly useful:

Different databases and suppliers may report slightly different physical-property values or specifications, so the relevant product specification should be checked against the actual grade and intended application. TCI, for example, lists a minimum 95% purity specification for its research-grade product and reports a reference melting point of 320 °C.

For development work, this distinction matters because a literature value, a catalog specification, and a batch-specific COA do not necessarily represent the same type of information.

What Is 1,4-Naphthalenedicarboxylic Acid Used For?

The applications of 1,4-Naphthalenedicarboxylic Acid are largely connected to its two carboxyl groups and rigid aromatic structure. It can participate in further chemical reactions and serve as a structural component in more complex materials.

Polymer and Polyester Synthesis

One of the most commercially relevant application areas is polymer chemistry. 1,4-Naphthalenedicarboxylic Acid can participate in condensation reactions with diols and other suitable monomers to produce aromatic polyester materials.

It has been described as a raw material for high-performance polyester systems and as a monomer associated with polyethylene naphthalate (PEN), liquid-crystal polymers, polyurethane-related materials, fibers, and other applications where thermal and mechanical performance are important.

The rigid naphthalene structure is particularly relevant here because the aromatic unit becomes part of the resulting polymer architecture rather than simply functioning as a temporary reaction reagent.

Organic Synthesis

1,4-Naphthalenedicarboxylic Acid can also serve as an intermediate in organic synthesis. Depending on the reaction route, the two carboxyl groups provide opportunities for further chemical modification, allowing the compound to be incorporated into more specialized aromatic structures.

This makes it relevant to research involving functional organic molecules, dyes, polymers, and other specialty chemicals.

Dyes, Coatings and Functional Materials

Chemical industry references also describe applications of 1,4-Naphthalenedicarboxylic Acid in dye-related chemistry, optical brighteners, coatings, and plastics. Its aromatic structure can contribute to the design of materials where rigidity, thermal properties, or optical characteristics are important.

The actual suitability depends heavily on the downstream synthesis route. Therefore, it is more useful to view 1,4-NDC as a versatile aromatic building block than to associate it with a single finished-product application.

Coordination Polymers and MOFs

The two carboxyl groups can also participate in coordination with metal ions. Research has demonstrated the use of 1,4-Naphthalenedicarboxylic Acid to construct coordination polymers with different metal centers.

This area is particularly relevant to research into porous materials, catalytic systems, fluorescent materials, and other functional coordination structures. However, these applications depend strongly on the selected metal, solvent, reaction conditions, and synthesis strategy.

Why Does the 1,4-Position Matter?

When searching for 1,4-Naphthalenedicarboxylic Acid CAS 605-70-9, it is important to distinguish the compound from other naphthalenedicarboxylic acid isomers.

The two carboxyl groups do more than determine the molecular formula. Their positions determine the spatial arrangement of the reactive sites. When the compound is used in polymerization, condensation, or metal coordination, this geometry can affect how the molecules connect and what type of structure is produced.

For this reason, replacing 1,4-NDC with another positional isomer should be treated as a chemical change rather than a simple substitution of equivalent raw materials. The appropriate isomer depends on the desired reaction and final material structure.

What Should Be Checked When Selecting 1,4-NDC?

The right evaluation criteria depend on the intended application, but several factors are generally worth confirming before using 1,4-Naphthalenedicarboxylic Acid in a synthesis.

First, confirm the chemical identity and CAS number to ensure that the intended positional isomer is being used. Next, review the purity and impurity profile, especially for polymerization, coordination chemistry, or other reactions where trace impurities may influence the final material.

Physical characteristics should also be considered. Since 1,4-NDC has very low water solubility and a high melting point, the solvent system, reaction temperature, mixing conditions, and material-handling procedure may need to be designed around these characteristics.

For development and scale-up work, batch documentation can provide additional information for evaluating consistency. A product specification and batch-specific COA should be considered together rather than relying only on a general database value.

1,4-Naphthalenedicarboxylic Acid for Chemical and Material Development

The combination of a rigid naphthalene structure and two carboxylic acid groups gives 1,4-Naphthalenedicarboxylic Acid CAS 605-70-9 a broad role in specialty chemical and material development.

Its reported uses range from organic synthesis and polyester production to dyes, coatings, plastics, coordination polymers, and functional materials. The most appropriate application depends on the reaction partner and the properties required from the final product.

For companies and research teams evaluating this compound, the key is therefore not simply to ask whether 1,4-NDC can react in a particular system, but whether its chemical identity, purity, physical properties, and documentation are appropriate for the intended synthesis.

Little Fox Bio provides 1,4-Naphthalenedicarboxylic Acid for chemical research and synthesis applications, with relevant product information and quality documentation available according to product requirements. This can support material screening, process development, and further chemical synthesis.

FAQ

What is 1,4-Naphthalenedicarboxylic Acid used for?

It is used as an organic synthesis intermediate and building block for polyester, polymer, dye, coating, coordination polymer, and other specialty material applications.

Is 1,4-Naphthalenedicarboxylic Acid soluble in water?

It is generally described as insoluble in water. This property should be considered when selecting solvents and designing reaction or purification processes.

What is the difference between 1,4-NDC and other naphthalenedicarboxylic acids?

The main difference is the position of the carboxyl groups on the naphthalene ring. Different positional isomers can have different molecular geometries and downstream reaction or coordination behavior.

What should be considered when selecting 1,4-Naphthalenedicarboxylic Acid?

Chemical identity, purity, impurity profile, physical form, water solubility, applicable specifications, and batch documentation should be evaluated according to the intended synthesis or material-development process.