27192-91-2

Basic information

• Product Name: 2,2',7,7'-TetrabroMo-9,9'-bifluorenylidene
• Synonyms: 2,2',7,7'-TetrabroMo-9,9'-bifluorenylidene
• CAS NO: 27192-91-2
• Molecular Formula: C₂₆H₁₂Br₄
• Molecular Weight: 643.98948
• Mol File: 27192-91-2.mol
• Article Data: 7

Chemical Properties

• Melting Point: 455°C(lit.)
• Boiling Point: 655.5±55.0 °C(Predicted)
• Appearance: /
• Density: 1.985±0.06 g/cm3(Predicted)
• CAS DataBase Reference: 2,2',7,7'-TetrabroMo-9,9'-bifluorenylidene(CAS DataBase Reference)
• NIST Chemistry Reference: 2,2',7,7'-TetrabroMo-9,9'-bifluorenylidene(27192-91-2)
• EPA Substance Registry System: 2,2',7,7'-TetrabroMo-9,9'-bifluorenylidene(27192-91-2)

Safety Data

• Hazardous Substances Data: 27192-91-2(Hazardous Substances Data)

Usage

Uses

2,2'',7,7''-Tetrabromo-9,9’-bifluoroenylidene (cas# 27192-91-2) is an electron acceptor used in organic electronics and solar cells.

Upstream product

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• 14348-75-5 2,7-dibromofluorene-9-one 
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• 54983-24-3 2,7-dibromo-9,9-dichloro-fluorene 
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• 23346-72-7 2,7,2'',7''-tetrabromo-[9,9';9',9'']terfluorene 
• 23346-73-8 2,7-dibromo-[9,9';9',9'']terfluorene 
• 113425-39-1 C₁₅H₁₀Br₂S₂ 
• 26279-24-3 2,7,9-tribromofluorene 

Downstream Products

• 16433-88-8 2,7-dibromo-9H-fluorene 

Relevant articles and documents

9,9′-Bifluorenylidene-Core Perylene Diimide Acceptors for As-Cast Non-Fullerene Organic Solar Cells: The Isomeric Effect on Optoelectronic Properties

Two different non-fullerene small-molecule acceptors, m-PIB and p-PIB, based on 9,9′-bifluorenylidene (BF) and perylene diimide (PDI) were designed and synthesized. Four β-substituted PDIs were linked to BF in different positions. Based on DFT analysis, derivative p-PIB exhibited reduced intramolecular twisting between the PDI moieties, more delocalized wave function, and sufficiently wider π-electron delocalization than that of m-PIB. The absorption ability of p-PIB was enhanced due to increased intermolecular interactions. By blending p-PIB with poly{4,8-bis[5-(2ethylhexyl)thiophen-2-yl]benzo[1,2-b:4,5-b′]dithiophene-co-3-fluorothieno[3,4-b]-thiophene-2-carboxylate} (PTB7-Th), organic solar cells (OSCs) based on p-PIB obtained a maximum power conversion efficiency of 5.95 % without any treatments. Due to the improved and balanced hole and electron mobilities, the short-circuit current and fill factor of OSCs based on PTB7-Th and p-PIB were significantly increased. The AFM and TEM results revealed that the PTB7-Th:p-PIB film had favorable nanoscale phase separation and formed a bicontinuous interpenetrating network.

ELECTROACTIVE MATERIALS, PRINTING COMPOSITIONS AND METHODS OF MANUFACTURING SOLAR CELLS

The present disclosure relates to electroactive materials such as hole transport materials (HTMs) for use in solar cells, for example solid state organic/hybrid solar cells such as solid state perovskite solar cells. The present disclosure also relates to

Strain and hueckel aromaticity: Driving forces for a promising new generation of electron acceptors in organic electronics

(Figure Presented) Straining at the leash: The main features of electron-accepting materials with a 9,9′-bifluorenylidene backbone are strain relief and a gain in aromaticity. These dimers (see picture) exhibit absorption near the red spectral region (ca. 600 nm) and HOMO (5.58-5.06 eV) and LUMO (3.37-3.09 eV) energy levels, which, together with high solubility and thermal stability render these materials attractive acceptors for bulk heterojunction (BHJ) solar cells.