Tetrakis(4-nitrophenyl)methane: Properties & Lab Uses

Benzene， 1，1'，1''，1'''-methanetetrayltetrakis[4-nitro- is a highly symmetric, tetrahedral nitro-functionalized aromatic compound that serves as a versatile building block in the design of porous organic frameworks, metal-organic frameworks, and advanced functional materials.

IUPAC Name

1,1',1'',1'''-methanetetrayltetrakis[4-nitrobenzene]

Core Architecture

Tetrahedral sp3 carbon center bearing four para-nitrophenyl arms

Functional Groups

Four terminal para-nitro (-NO2) groups on aromatic rings

Primary Applications

Building block for COFs, MOFs, cage compounds, and organic semiconductors

Key Reactivity

Nitro groups amenable to reduction to amines, enabling further functionalization

Symmetry

Td point group symmetry; four equivalent nitrophenyl substituents

SKU

B710575

Chemical Identity and Structural Features

Benzene, 1,1',1'',1'''-methanetetrayltetrakis[4-nitro-, commonly referred to as Tetrakis(4-nitrophenyl)methane, is characterized by a central quaternary carbon atom bonded to four equivalent 4-nitrophenyl groups. This arrangement confers exceptional three-dimensional (Td) symmetry upon the molecule, making each nitro-bearing arm geometrically equivalent and radially disposed in a tetrahedral fashion.

The molecule belongs to the class of nitro-functionalized poly(aryl)methanes. The four para-nitro substituents are electron-withdrawing, reducing electron density across the aromatic rings and imparting distinctive photophysical and electrochemical properties. The rigid, propeller-like geometry minimizes intramolecular π–π stacking while enabling effective intermolecular packing in the solid state, relevant to crystal engineering and materials design.

The quaternary carbon core provides chemical stability under a broad range of reaction conditions, and the compound is a solid at room temperature with low solubility in water but moderate to good solubility in common polar aprotic solvents such as DMF and DMSO.

Synthesis and Functionalization Pathways

Tetrakis(4-nitrophenyl)methane is typically synthesized through acid-catalyzed condensation or arylation reactions that assemble four nitrophenyl units around a central carbon. Classical routes employ electrophilic aromatic substitution strategies or the reaction of suitable carbon electrophiles with nitrobenzene derivatives under Lewis or Brønsted acid conditions.

A particularly important downstream transformation is the reduction of the four nitro groups to primary amines, yielding Tetrakis(4-aminophenyl)methane. This tetra-amine is a widely used node in the synthesis of covalent organic frameworks (COFs) and polyimide networks, where it condenses with di- or tetra-aldehydes and anhydrides to form extended porous architectures. Researchers can also perform selective mono- or partial reductions to access asymmetrically functionalized intermediates for more complex molecular designs.

Other chemical transformations accessible from the nitro compound include nucleophilic aromatic substitution (SNAr) under forcing conditions, electrochemical reduction, and photochemical reactions, broadening the scope of accessible derivatives without requiring re-synthesis of the carbon core.

Applications in Materials Science and Research

The tetrahedral geometry and multi-functional periphery of Tetrakis(4-nitrophenyl)methane make it an indispensable building block across several frontier research domains:

• Covalent Organic Frameworks (COFs): After reduction to the tetra-amine, the compound serves as a 4-connected node in imine- or amide-linked COFs with high surface areas and defined pore geometries, targeted for gas adsorption, separation, and catalysis.
• Metal-Organic Frameworks (MOFs): The nitro groups, or their amine derivatives, coordinate with metal ions or act as hydrogen-bond donors/acceptors, directing crystalline porous architectures.
• Organic Cage Compounds: The tetrahedral core templates the self-assembly of three-dimensional porous organic cages with potential applications in molecular recognition and sensing.
• Organic Electronics and Photovoltaics: The extended conjugation and electron-withdrawing nitro groups influence charge transport and light absorption, relevant to organic semiconductor device development.
• Crystal Engineering: The predictable geometry supports the rational design of co-crystals and hydrogen-bonded organic frameworks (HOFs).

These properties collectively position Tetrakis(4-nitrophenyl)methane as a high-value reagent for materials chemistry, supramolecular chemistry, and catalysis research.

Handling, Storage, and Safety Considerations

As with all nitro-aromatic compounds, Tetrakis(4-nitrophenyl)methane should be handled with appropriate laboratory precautions. Standard personal protective equipment (PPE) including lab coat, chemical-resistant gloves, and safety eyewear is recommended during weighing and manipulation. Operations should be performed in a well-ventilated fume hood to minimize inhalation exposure to fine particulates.

The compound should be stored in a cool, dry environment away from strong reducing agents, open flames, and sources of heat or ignition, as nitro-aromatic compounds can be sensitive to thermal decomposition under extreme conditions. Storage in a tightly sealed container under inert atmosphere is advisable when long-term stability is a concern.

Researchers should consult the Safety Data Sheet (SDS) supplied by Aladdin Scientific for product-specific hazard classifications, first-aid measures, and disposal guidance in accordance with local regulatory requirements. Waste containing nitro-aromatic compounds must be segregated and disposed of through an approved chemical waste stream.

Frequently asked questions

What is the main use of Tetrakis(4-nitrophenyl)methane in research?

Tetrakis(4-nitrophenyl)methane is primarily used as a tetrahedral building block for the synthesis of covalent organic frameworks (COFs), metal-organic frameworks (MOFs), and porous organic cage compounds. Its four nitro groups can be readily reduced to amines, enabling further condensation into extended porous architectures.

How can the nitro groups in Tetrakis(4-nitrophenyl)methane be converted for further functionalization?

The nitro groups can be reduced to primary amine groups using standard catalytic hydrogenation conditions (e.g., Pd/C under H2) or chemical reductants such as iron powder in acetic acid. The resulting tetra-amine, Tetrakis(4-aminophenyl)methane, is a highly versatile intermediate for imine-linked COFs and polyimide networks.

What solvents are suitable for dissolving Tetrakis(4-nitrophenyl)methane?

Tetrakis(4-nitrophenyl)methane has low solubility in water and common protic solvents. Polar aprotic solvents such as dimethylformamide (DMF), dimethyl sulfoxide (DMSO), and N-methyl-2-pyrrolidone (NMP) are generally recommended for dissolving this compound at useful concentrations.

Is Tetrakis(4-nitrophenyl)methane suitable for use in organic electronics?

Yes, the electron-withdrawing nitro groups and extended aromatic system of Tetrakis(4-nitrophenyl)methane make it a candidate material for organic electronics applications, including use as an electron-accepting component or precursor in organic photovoltaics and semiconductors. Its specific device performance characteristics should be evaluated experimentally.

References

1. Cooper, A. I. Porous Molecular Solids and Liquids. ACS Central Science 2017, 3, 544–553. [Review of porous organic cage and COF building block strategies]
2. Diercks, C. S.; Yaghi, O. M. The atom, the molecule, and the covalent organic framework. Science 2017, 355, eaal1585. [Foundational review of COF design using tetrahedral nodes]
3. Aladdin Scientific Product Listing: Benzene, 1,1',1'',1'''-methanetetrayltetrakis[4-nitro-, SKU B710575.

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