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CAS Number 41122-71-8

Liquid Crystals, Materials, Optoelectronic Materials

Product Code M2359A1-5g
Price $163 ex. VAT

4′-Heptyl-4-biphenylcarbonitrile (7CB), liquid crystal (nematic).

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′-Heptyl-4-biphenylcarbonitrile (7CB), CAS number 41122-71-8, has a simple structure of 1,1'-biphenyl with cyano and heptyl groups located at 4,4'-positions. 7CB belongs to the family of thermotropic liquid crystals from the cyanobiphenyl family. 

Studies showed that the dispersion of CQDs in host nematic matrix can induce the  quenching of photoluminescence and reduce the UV–Vis absorbance of pure nematic at a lower wavelength. Dielectric properties of the 7CB liquid crystal can change quite significantly when multiwalled carbon nanotubes are presented in the liquid crystal matrix.

Liquid crystal molecule 4′-heptyl-4-biphenylcarbonitrile can also enhance the device performance of perovskite solar cells by interacting with PbI2 to control the crystal growth orientation for fine and oriented perovskite domains for the benefit of electron transport and device stability. When compared with the pristine devices, the power conversion efficiency (PCE) of the liquid crystal based device improved from 17.14% to 20.19% with a high fill factor (FF over 80%). Also 7BC based PSCs retain 92% of their initial efficiency at 25 °C, and a relative humidity of 70% after 500 h, whereas the control devices are almost degraded completely.

Liquid crystal

Liquid crystal

With biphenylcarbonitrile core

Induce alignment

Induce alignment

To improve perovskite solar cells performance

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High purity

High purity

>98% High purity

Chemical Structure

4'-Heptyl-4-biphenylcarbonitrile, CAS 41122-71-8
Chemical structure of 4'-Heptyl-4-biphenylcarbonitrile, CAS 41122-71-8

General Information

CAS Number 41122-71-8
Chemical Formula C20H23N
Molecular Weight 277.40
Full Name 4′-Heptyl-4-biphenylcarbonitrile
Synonyms 7CB, 4-Cyano-4'-heptylbiphenyl, 4'-Heptyl-4-biphenylcarbonitrile
Classification / Family Biphenylcarbonitrile, Nematic Liquid Crystals

Product Details

Purity >98% (1HNMR)
Form White powder/crystals
Mesomorphic Range 27.0 to 45.0 °C
Melting Point Tm = 36.0 °C


Batch Quantity Price
M2359A1 5 g £130
M2359A1 10 g £220
M2359A1 25 g £440

MSDS Documentation

4′-Heptyl-4-biphenylcarbonitrile MSDS4′-Heptyl-4-biphenylcarbonitrile MSDS Sheet

Literature and Reviews

  1. Optical properties and zeta potential of carbon quantum dots (CQDs) dispersed nematic liquid crystal 4′- heptyl-4-biphenylcarbonitrile (7CB), F. Pandey et al., Opt. Mater., 105, 109849 (2020); DOI: 10.1016/j.optmat.2020.109849.
  2. Liquid Crystal Molecule as “Binding Agent” Enables Superior Stable Perovskite Solar Cells with High Fill Factor, L. Tao et al., RRL Solar, 3 (8), 1900125 (2019); DOI: 10.1002/solr.201900125.
  3. Liquid crystalline cyanobiphenyl homologues doped with gold nanoparticles, K. Vardanyan et al., Liq. Cryst., 39 (9), 1083–1098 (2012); DOI: 10.1080/02678292.2012.696729.
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