FREE shipping to on qualifying orders when you spend or more, processed by Ossila BV. All prices ex. VAT. Qualifying orders ship free worldwide! Fast, secure, and backed by the Ossila guarantee. It looks like you are visiting from , click to shop in or change country. Orders to the EU are processed by our EU subsidiary.

It looks like you are using an unsupported browser. You can still place orders by emailing us on info@ossila.com, but you may experience issues browsing our website. Please consider upgrading to a modern browser for better security and an improved browsing experience.


Product Code B601-1g
Price £330 ex. VAT

High purity monomer

Widely used building block for the synthesis of ultra-narrow band-gap non-fullerene acceptors


Specifications | MSDS | Literature and Reviews


5-Bromo-4-((2-ethylhexyl)oxy)-2-thiophenecarboxaldehyde (EHOThCHO-Br), CAS number 2055812-54-7, is a thiophene derivative with multiple functional groups around the thiophene ring. Both bromo and aldehyde functional groups at 2,5-positions enable C-C formation to grow the chain length and extend its conjugation in the targeted semiconducting molecules. Ethylhexyloxyl group is there not only to enhance the solubility but also to lower the HOMO/LUMO energy levels of the targeted molecules. Comparing with the molecules bearing ethylhexyl group, molecules with ethylhexyloxyl side chains extend their absorption further to near infrared (NIR) region. 5-Bromo-4-((2-ethylhexyl)oxy)-2-thiophenecarboxaldehyde is a widely used building block that is used for the synthesis of ultra-narrow band-gap non-fullerene acceptors (NFAs) such as IEICO, IEICO-4F and IEICO-4Cl.

Absorption of IEICO-4F mainly locates in the deep-red and near infrared region, ranging from ~700 nm to ~1000 nm.

Functional thiophene derivative

Functional thiophene derivative

Synthsis of semiconducting materials

High purity 2055812-54-7

High purity

>98% EHOThCHO-Br Purity

Worldwide shipping for 2055812-54-7

Worldwide shipping

Quick and reliable shipping

Ethylhexyloxyl group

Ethylhexyloxyl group

Enhances solubility and lowers HOMO/LUMO energy levels

General Information


CAS Number 2055812-54-7
Chemical Formula C13H19BrO2S
Molecular Weight 319.26 g/mol
Synonyms 5-Bromo-4-((2-ethylhexyl)oxy)-2-thiophenecarboxaldehyde
Classification / Family Thiophene derivatives, Organic semiconducting materials, Semiconductor Synthesis, Low band gap polymers, OFETs, OLED, Organic Photovoltaics, None-fullerene acceptors (NFAs), NFA-OSCs.

Chemical Structure


EHOThCHO-Br chemical structure
Chemical structure of 5-Bromo-4-((2-ethylhexyl)oxy)-2-thiophenecarboxaldehyde (EHOThCHO-Br), CAS 2055812-54-7

Product Details


Purity >98%
Melting Point N/A
Appearance Brown liquid

MSDS Documentation


EHOThCHO-Br MSDSEHOThCHO-Br MSDS Sheet

Literature and Reviews


  1. Ultra-narrow bandgap non-fullerene organic solar cells with low voltage losses and a large photocurrent, J. Mater. Chem. A, 6, 19934-19940 (2018); DOI:10.1039/C8TA07954D.
  2. Improved charge transfer, mobility and morphology for high performance panchromatic organic photodetectors by adding PC71BM in P3HT:IEICO-4F, Y. Han et al., Org. Electron., 75, 105410 (2019); doi: 10.1016/j.orgel.2019.105410.
  3. 12.5% Flexible Nonfullerene Solar Cells by Passivating the Chemical Interaction Between the Active Layer and Polymer Interfacial Layer, S. Xiong et al., Adv Mater., 31(22):e1806616 (2019); doi: 10.1002/adma.201806616.

Return to the top