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CAS Number 40817-08-1

Liquid Crystals, Materials, Optoelectronic Materials

Product Code M2361A1-10g
Price £105 ex. VAT

4′-Pentyl-4-biphenylcarbonitrile (8OCB), room temperature liquid crystal (nematic)

Liquid crystal for the application of optical electronics i.e. in liquid-crystal display (LCD)

Specifications | Pricing and Options | MSDS | Literature and Reviews

4′-Pentyl-4-biphenylcarbonitrile (5CB), CAS number 40817-08-1, is a nematic liquid crystal at room temperature with a chemical structure of cyano and pentyl substituted 1,1'-biphenyl at 4,4'-positions. 5CB undergoes a phase transition from a crystalline state to a nematic state at 22.5 °C and it goes from a nematic to an isotropic state at 35.0 °C.

In a binary 5CB/7CB mixture, crystal to nematic transition only is observed at lower rates but no apparent phase transition at higher rates, This gives a indication of a favourable synergism in the binary mixture compared to the pure system. Nematic to crystalline transition, however, is not observed in the binary mixture with increased disorder due to the different chain lengths presented in the liquid crystal phase.

When ZnO NPs is presented in 5CB as an additive, not only the threshold voltage but also the driving voltage (Vd) of 5CB can be dramatically decreased. The decrease of driving voltage of liquid crystal can help reduce power consumption for liquid crystal displays.

Room temperature nematic liquid crystal

Room temperature nematic liquid crystal

Mesomorphic range 18.0 to 35.0 °C

Reduced power consumption for liquid crystal displays

Reduced power consumption for liquid crystal displays

Decreases threshold voltage and driving voltage with ZnO

Worldwide shipping for 40817-08-01

Worldwide shipping

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High purity

High purity

>98% High purity

Chemical Structure

4-Cyano-4'-pentylbiphenyl chemical structure, CAS 40817-08-1
Chemical structure of 4-Cyano-4'-pentylbiphenyl (5CB), CAS 40817-08-1

General Information

CAS Number 40817-08-1
Chemical Formula C18H19N
Molecular Weight 249.36
Full Name 4′-Pentyl-4-biphenylcarbonitrile
Synonyms 5CB, 4-Cyano-4'-pentylbiphenyl, 4-Pentyl-4-cyanobiphenyl
Classification / Family Biphenylcarbonitrile, Room Temperature Liquid Crystals

Product Details

Purity >98% (1HNMR)
Form White liquid
Refractive Index n20/D 1.532 (lit.)
Mesomorphic Range 18.0 to 35.0 °C (lit.)
Density 1.008 g/mL at 25 °C (lit.)
Boiling Point 215 °C/3.0 mmHg


Batch Quantity Price
M2361A1 10 g £105
M2361A1 25 g £210
M2361A1 50 g £350

MSDS Documentation

4′-Pentyl-4-biphenylcarbonitrile MSDS4′-Pentyl-4-biphenylcarbonitrile MSDS Sheet

Literature and Reviews

  1. Low Driving Voltage of a Liquid Crystal Device Fabricated from 4′-Pentyl-4-biphenylcarbonitrile Doped with Environmentally Friendly ZnO Nanoparticles, J. Hui et al., Chem. Lett., 38 (6), 566-567 (2009); DOI: 10.1246/cl.2009.566.
  2. Dielectric studies of dispersions of carbon nanotubes in liquid crystals 5CB, A. Koval’chuk et al., Semicond. Phys. Quantum Electron. Optoelectron., 44 (4), 337-341 (2008); DOI:10.15407/spqeo11.04.337.
  3. A new approach to study interaction parameters in cyanobiphenyl liquid crystal binary systems, S. Javadian et al., J. Chem. Thermodynamics 80, 22–29 (2015); DOI: 10.1016/j.jct.2014.08.010.
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