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, but you may experience issues browsing our website. Please consider upgrading to a modern browser for better security and an improved browsing experience.


CAS Number 2289758-98-9

Carbaldehyde Monomers, Chemistry Building Blocks, COF Ligands, Materials, Monomers, Porous Organic Frameworks

Product Code B3831-1g
Price £83 ex. VAT

Covalent Organic Frameworks (COFs) Phenylethynylbenzene Ligand

A formyl functional ligand linker for COFs in application of carbon dioxide reduction and photocatalytic H2O2 production

Specifications | MSDS | Literature and Reviews

C3-type electron-rich monomer 4,4',4''-(Benzene-1,3,5-triyltris(ethyne-2,1-diyl))tribenzaldehyde (BTETBA), CAS number 2289758-98-9, is consisted of three 4-formylphenylethynyl functional groups sitting on the meta positions of a benzene ring.

Metal-free covalent organic framework, BTETBA-COF was obtained by incorporating ethynyl groups into the conjugated skeleton. The bridging with the ethynyl groups afforded a significant improvement in π-conjugation and photogenerated charge separation and transfer, promoting CO2 photoreduction in a solid-gas mode with only water vapor and CO2. The CO production rate with BTETBA-COF as the photocatalyst reached as high as 382.0 µmol g−1 h−1, ranking as one of the best among all additive-free CO2 photoreduction catalysts. Another BTETBA-TRz-COF, with spatially separated triazine and acetylene units, was engaged for photocatalytic H2O2 production. The spatial separation of triazine and acetylene cores leads to efficient charge separation and suppressed charge recombination, and carbon-carbon double bond linkage facilitates electrons transport over the skeletons.

MOF and COF ligands

MOF and COF ligands

Aldehyde ligand for cross-linked COF networks

Worldwide shipping for 2289758-98-9

Worldwide shipping

Quick and reliable shipping

High purity 2289758-98-9

High purity

>97% High purity

Facile reactions

Facile reactions

Aldehyde possesses excellent reactivity

General Information

CAS Number 2289758-98-9
Chemical Formula C33H18O3
Full Name 4,4',4''-(Benzene-1,3,5-triyltris(ethyne-2,1-diyl))tribenzaldehyde
Molecular Weight 462.49 g/mol
Synonyms BTETBA, BTEA, TPEB-CHO, BTTA, 1,3,5-tris(4-formylphenylethynyl)benzene
Classification / Family Phenylethynylbenzene, COF ligands

Chemical Structure

2289758-98-9 - 4,4',4''-(benzene-1,3,5-triyltris(ethyne-2,1-diyl))tribenzaldehyde chemical structure
4,4',4''-(Benzene-1,3,5-triyltris(ethyne-2,1-diyl))tribenzaldehyde (BTETBA) Chemical Structure, 2289758-98-9

Product Details

Purity >97%
Melting Point N/A
Appearance White to off-white powder to fibres/crystals

MSDS Documentation

4,4',4''-(Benzene-1,3,5-triyltris(ethyne-2,1-diyl))tribenzaldehyde4,4',4''-(Benzene-1,3,5-triyltris(ethyne-2,1-diyl))tribenzaldehyde MSDS Sheet

Literature and Reviews

  1. Constructing Synergistic Triazine and Acetylene Cores in Fully Conjugated Covalent Organic Frameworks for Cascade Photocatalytic H2O2 Production, L. Zhao et al., Chem. Mater., 34 (11), 5232–5240 (2022); DOI: 10.1021/acs.chemmater.2c00910.
  2. Regulating π-Conjugation in sp2-Carbon-Linked Covalent Organic Frameworks for Efficient Metal-Free CO2 Photoreduction with H2O, L. Yang et al., Small, 19 (27), 2208118 (2023); DOI: 10.1002/smll.202208118.
  3. Engineering active sites in two dimensional covalent organic frameworks boosts the capture of iodine, L. Yang et al., Sep. Purif. Technol., 328, 125054 (2024); DOI: 10.1016/j.seppur.2023.125054.
Return to the top