Order Code: B101


(excluding Taxes)


General Information

CAS number 15155-41-6
Chemical formula C6H2Br2N2S
Molecular weight 293.97 g/mol

Dibromo Benzothiodiazole


Classification / Family

Benzothiodiazole, PCPDTBT

Semiconductor Synthesis, Low band gap polymers, Acceptors

Organic Photovoltaics, Polymer Solar Cells


Product Details



Melting point


Color Light yellow crystals


Chemical Structure

chemical structure of dibromobenzothiadiazole cas number 15155-41-6
Chemical structure of 4,7-Dibromo-2,1,3-benzothiadiazole
CAS number 15155-41-6; Chemical formula C6H2Br2N2S



4,7-Dibromo-2,1,3-benzothiadiazole is the building block or monomer for organic semiconductors synthesis in the application of light-emitting diodes and photovoltaic devices. Intermediate for the synthesis of i.e. PCDTBT and PCPDTBT.

4,7-Dibromo-2,1,3-benzothiadiazole can be synthesised by using 2,1,3-benzothiadiazole as starting materials to react with bromine in hydrobromic acid. Further bromination of 4,7-Dibromo-2,1,3-benzothiadiazole affords 4,7-bis(5-bromothiophen-2-yl)benzo[c][1,2,5]thiadiazole, a red monomer leading to our pilot polymer PCDTBT which can be used for OPV devices. 4,7-Dibromo-2,1,3-benzothiadiazole is also used for the synthesis of PCPDTBT, a good candidate for the polymer solar cell devices.

dibromo thienyl benzothiadiazole synthesis with benzothiadiazole via dibromo benzothiadiazole
Synthesis of 4,7-bis(5-bromothiophen-2-yl)benzo[c][1,2,5]thiadiazole from 2,1,3-benzothiadiazole via 4,7-Dibromo-2,1,3-benzothiadiazole


NMR Characterisation

1H NMR of Dibromo-benzothiadiazole in CDCl3

1H NMR spectrum of 4,7-Dibromo-2,1,3-benzothiadiazole in CDCl3: Instrument AVIIIHD400 (see full version)

Literature and Reviews

  1. Introduction of Perylene Units for Enhanced Interchain Interaction in Conjugated Polymers for Organic Photovoltaic Devices, K. Ji-Hoon et al., Macromolecules, 45(5), 2367-2376 (2012)
  2. Fluorinated Copolymer PCPDTBT with Enhanced Open-Circuit Voltage and Reduced Recombination for Highly Efficient Polymer Solar Cells, S. Albrecht et al., J. Am. Chem. Soc., 134, 14932-14944 (2012)