Chemical Structure and Physicochemical Properties

4-Cyano-3-fluorophenyl 4-(4-ethylcyclohexyl)benzoate (Aladdin SKU C1065064) is a rod-shaped organic molecule that belongs to the broad class of benzoate ester mesogens. Its molecular architecture consists of three recognizable segments: (1) a 4-cyano-3-fluorophenyl ester group acting as the polar terminal unit, (2) a central benzoate ester linkage providing rigidity and conjugation, and (3) a 4-ethylcyclohexyl substituent offering a semi-flexible aliphatic tail.

The incorporation of fluorine at the 3-position of the cyanophenyl ring introduces a strong local dipole moment and modifies the electron density distribution across the aromatic system, which can influence dielectric anisotropy, birefringence, and the temperature range of mesophase stability. The cyano group at the 4-position adds a high longitudinal dipole that is characteristic of many commercially important nematic liquid crystal materials.

The 4-ethylcyclohexyl group adopts predominantly an equatorial conformation, contributing to molecular linearity — a geometric requirement for nematic mesophase formation. The ester bridge between the benzoyl and the fluorocyanophenyl moieties further enhances molecular polarizability.

Note: Exact melting point, clearing point, and dielectric data should be verified against the manufacturer's Certificate of Analysis (CoA). Values not available in the current source material are flagged for review.

Liquid Crystal Behaviour and Mesophase Characteristics

Compounds of this structural class — combining a rigid benzoate ester core with a polar fluorocyanophenyl headgroup and an aliphatic cyclohexyl tail — are well established as nematic or smectic liquid crystal materials. The precise mesophase type (nematic, smectic A, smectic C, or others) and transition temperatures for 4-Cyano-3-fluorophenyl 4-(4-ethylcyclohexyl)benzoate depend on the specific balance of steric, electronic, and intermolecular interactions intrinsic to its molecular geometry.

Fluorine substitution adjacent to the cyano group is a widely employed strategy in liquid crystal chemistry to fine-tune the dielectric anisotropy (Δε) and to modify the clearing temperature (T_NI). High dielectric anisotropy is particularly desirable for electro-optical switching applications, including twisted nematic (TN) and in-plane switching (IPS) display technologies.

When used as a component in multicomponent LC mixtures, this compound can help broaden the nematic temperature range, adjust viscosity, and optimize threshold voltage. The ethyl substituent on the cyclohexyl ring contributes to the fine adjustment of melting point and mesophase range relative to methyl or propyl analogues.

Specific transition temperatures and mesophase assignments for this exact compound require experimental characterisation (DSC, POM) or literature confirmation; these are flagged as needing review.

Synthesis and Structural Analogues

Benzoate ester mesogens of this family are generally synthesised via esterification of the corresponding benzoic acid derivative with the appropriate phenol. For 4-Cyano-3-fluorophenyl 4-(4-ethylcyclohexyl)benzoate, the retrosynthetic disconnection suggests two key precursors: 4-(4-ethylcyclohexyl)benzoic acid and 4-cyano-3-fluorophenol (also known as 2-fluoro-4-hydroxybenzonitrile).

The esterification can be accomplished under standard conditions using coupling reagents such as dicyclohexylcarbodiimide (DCC) with catalytic 4-dimethylaminopyridine (DMAP), or via acid chloride intermediate formation followed by reaction with the fluorophenol under mild base. Both routes are well precedented in the liquid crystal literature for analogous ester mesogens.

Structural analogues include other 4-cyanophenyl and 4-cyano-3-fluorophenyl esters of 4-alkylcyclohexylbenzoic acids, which form a large combinatorial family differing in the alkyl chain length (methyl, propyl, butyl, pentyl). These are widely used as reference compounds in mesophase studies and LC mixture optimisation programs.

Specific synthetic yields, reaction conditions, or literature references for this exact compound are not available in the current source material and should be verified independently.

Research Applications and Ordering Information

4-Cyano-3-fluorophenyl 4-(4-ethylcyclohexyl)benzoate (C1065064) is suitable for research applications including:

• Liquid crystal mixture formulation: As a component in nematic or smectic host mixtures for the systematic study of mesophase behaviour, dielectric properties, and optical anisotropy.
• Electro-optical device research: For evaluation in prototype LC cells targeting display or photonic applications.
• Structure–activity relationship (SAR) studies: As part of a series of fluorinated benzoate mesogens to establish correlations between molecular structure and mesophase properties.
• Thermal analysis reference: As a calibration or reference standard in differential scanning calorimetry (DSC) and polarised optical microscopy (POM) studies of phase transitions.

Researchers requiring this compound may order directly from Aladdin Scientific under SKU C1065064. For quantity pricing, bulk availability, and custom purity specifications, contact Aladdin Scientific technical sales. Always consult the current Safety Data Sheet (SDS) and Certificate of Analysis (CoA) before use.