Description

4-Cyano-4′-pentylbiphenyl (CAS No. 40817-08-1) is a high-purity liquid crystal compound with the molecular formula C₁₈H₁₉N. This biphenyl derivative features a cyano group at the 4-position and a pentyl chain at the 4′-position, making it a key component in nematic liquid crystal mixtures for advanced electro-optical applications. Our product is synthesized under strict quality control to ensure >99% purity (HPLC), with low ionic content and excellent batch-to-batch consistency. The material exhibits a wide nematic phase range, optimal birefringence (Δn ≈ 0.18-0.22), and good dielectric anisotropy, making it particularly valuable for twisted nematic (TN) and super-twisted nematic (STN) LCD displays. Packaged under nitrogen in amber glass vials to prevent degradation, this compound is ideal for research in liquid crystal formulations, display technology development, and advanced materials science.

Properties

• CAS Number: 40817-08-1
• Complexity: 284
• IUPAC Name: 4-(4-pentylphenyl)benzonitrile
• InChI: InChI=1S/C18H19N/c1-2-3-4-5-15-6-10-17(11-7-15)18-12-8-16(14-19)9-13-18/h6-13H,2-5H2,1H3
• InChI Key: HHPCNRKYVYWYAU-UHFFFAOYSA-N
• Exact Mass: 249.151749610
• Molecular Formula: C18H19N
• Molecular Weight: 249.3
• SMILES: CCCCCC1=CC=C(C=C1)C2=CC=C(C=C2)C#N
• Topological: 23.8
• Monoisotopic Mass: 249.151749610
• Synonyms: 4-Cyano-4′-pentylbiphenyl, [1,1′-Biphenyl]-4-carbonitrile, 4′-pentyl-, p-Cyano-p’-pentylbiphenyl, 4-n-pentyl-4′-cyanobiphenyl, 4′-pentylbiphenyl-4-carbonitrile, 2R6RYG3ZGM, 4′-Pentyl[1,1′-biphenyl]-4-carbonitrile, 4′-pentyl-4-cyanobiphenyl, pentyl cyanobiphenyl, EINECS 255-093-2, (1,1′-Biphenyl)-4-carbonitrile, 4′-pentyl-, 4,4′-n-Pentylcyanobiphenyl, DTXSID3068255, 4?-Pentyl-biphenyl-4-carbonitrile, 4′-n-Pentyl-4-biphenylcarbonitrile, 4′-Pentyl(1,1′-biphenyl)-4-carbonitrile, DTXCID4039817, hhpcnrkyvywyau-uhfffaoysa-n, inchi=1/c18h19n/c1-2-3-4-5-15-6-10-17(11-7-15)18-12-8-16(14-19)9-13-18/h6-13h,2-5h2,1h, 40817-08-1, 4′-Pentyl-[1,1′-biphenyl]-4-carbonitrile, 4-Cyano-4′-n-pentylbiphenyl, 4′-Pentyl-4-biphenylcarbonitrile, 4-(4-pentylphenyl)benzonitrile, 4-Pentyl-4′-cyanobiphenyl, MFCD00036350, 5CB, 4-Cyano-4-pentylbiphenyl, 4-(4-pentylphenyl)benzenecarbonitrile, 4′-Amyl-4-biphenylcarbonitrile, UNII-2R6RYG3ZGM, SCHEMBL263560, 4′-Heptyl-4-biphenylcarbonitrile, SBB008542, AKOS015839649, CS-W012656, AS-17503, SY036398, DB-009037, 4-Pentyl-[1,1′-biphenyl]-4′-carbonitrile, NS00030851, ST50825933, 4′-Pentyl[1,1′-biphenyl]-4-carbonitrile #, Q1490706, 4-Cyano-4 inverted exclamation mark -n-Pentylbiphenyl, 4 inverted exclamation mark -Pentylbiphenyl-4-carbonitrile, 4 inverted exclamation marka-Pentyl-4-biphenylcarbonitrile, 4′-Pentyl-4-biphenylcarbonitrile, liquid crystal (nematic), 98%, 4-(4′-Pentylphenyl)benzonitrile; 4′-Pentyl[1,1′-biphenyl]-4-carbonitrile

Application

4-Cyano-4′-pentylbiphenyl serves as a fundamental component in nematic liquid crystal mixtures for display technologies, particularly in watch and calculator LCDs. Researchers utilize this compound to study phase transition behavior and electro-optical properties in liquid crystal systems. Its stable nematic phase makes it valuable for developing temperature-sensitive optical devices and testing new alignment layers.

Safety and Hazards

GHS Hazard Statements

• H302 (83.6%): Harmful if swallowed [Warning Acute toxicity, oral]
• H312 (83.6%): Harmful in contact with skin [Warning Acute toxicity, dermal]
• H315 (74.5%): Causes skin irritation [Warning Skin corrosion/irritation]
• H317 (16.4%): May cause an allergic skin reaction [Warning Sensitization, Skin]
• H319 (74.5%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]
• H332 (83.6%): Harmful if inhaled [Warning Acute toxicity, inhalation]
• H335 (74.5%): May cause respiratory irritation [Warning Specific target organ toxicity, single exposure; Respiratory tract irritation]

Precautionary Statements

• P261, P264, P264+P265, P270, P271, P272, P280, P301+P317, P302+P352, P304+P340, P305+P351+P338, P317, P319, P321, P330, P332+P317, P333+P317, P337+P317, P362+P364, P403+P233, P405, and P501

Hazard Classes and Categories

• Acute Tox. 4 (83.6%)
• Acute Tox. 4 (83.6%)
• Skin Irrit. 2 (74.5%)
• Skin Sens. 1 (16.4%)
• Eye Irrit. 2 (74.5%)
• Acute Tox. 4 (83.6%)
• STOT SE 3 (74.5%)

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