1338725-52-2

Upstream product

• 104-36-9 1,4-dibutoxybenzene 
• 123-31-9 hydroquinone 
• 3034-86-4 4-ethynylbenzoic acid methyl ester 
• 145483-70-1 1,4-di-n-butoxy-2,5-diiodobenzene 

Downstream Products

• 1338725-54-4 dimethyl 4,4'-(4,4'-(ethyne-1,2-diyl)bis(2,5-dibutoxy-4,1-phenylene))bis(ethyne-2,1-diyl)dibenzoate 

Relevant academic research and scientific papers

New water soluble terphenylene diethynylene fluorophores

Inspired by our earlier works on sensors from dendritic phenyleneethynylenes, two new star-shaped water-soluble fluorophores containing terphenylene diethynylene units and anionic carboxylate peripheries are successfully synthesized. The convergent synthesis relies on Sonogashira cross-coupling reactions between tris-(4-ethynylphenyl)amine and the iodophenyleneethynylene branches. All of the compounds are characterized by 1H, 13C NMR, and mass spectrometry. In aqueous solution, the less polar fluorophore 1 shows lower quantum yield than 2 (18 vs 33 %) as a result of hydrophobic induced aggregation. One of these anionic water-soluble fluorophores exhibits a selective fluorescence quenching by Fe3+ ion in phosphate buffer pH 8.