1235990-39-2

Basic information

• Product Name: 2-ethynyl-7-(4-(4-methylstyryl)styryl)-9,9-dioctyl-9H-fluorene
• Synonyms: 2-ethynyl-7-(4-(4-methylstyryl)styryl)-9,9-dioctyl-9H-fluorene
• CAS NO: 1235990-39-2
• Molecular Weight: 632.973
• Mol File: 1235990-39-2.mol

Chemical Properties

• CAS DataBase Reference: 2-ethynyl-7-(4-(4-methylstyryl)styryl)-9,9-dioctyl-9H-fluorene(CAS DataBase Reference)
• NIST Chemistry Reference: 2-ethynyl-7-(4-(4-methylstyryl)styryl)-9,9-dioctyl-9H-fluorene(1235990-39-2)
• EPA Substance Registry System: 2-ethynyl-7-(4-(4-methylstyryl)styryl)-9,9-dioctyl-9H-fluorene(1235990-39-2)

Safety Data

• Hazardous Substances Data: 1235990-39-2(Hazardous Substances Data)

Upstream product

• 198964-46-4 2,7-dibromo-9,9-dioctylfluorene 
• 111-83-1 1-bromo-octane 
• 16433-88-8 2,7-dibromo-9H-fluorene 
• 726-61-4 [(4-ethenylphenyl)methyl]phosphonic acid diethyl ester 
• 1592-20-7 4-Vinylbenzyl chloride 

Relevant articles and documents

Polyfluorenylacetylene for near-infrared laser protection: Polymer synthesis, optical limiting mechanism and relationship between molecular structure and properties

A series of functional polyacetylenes bearing the fluorene moiety with different conjugated lengths and terminal substituents, poly[2-ethynyl-7-(4-nitrostyryl)-9,9-dioctyl-9H-fluorene] (P1), poly[2-ethynyl-7-(4-(4-nitrostyryl)styryl)-9,9-dioctyl-9H-fluorene] (P2), poly[2-ethynyl-7-(4-(4-methoxystyryl)styryl)-9,9-dioctyl-9H-fluorene] (P3), poly[2-ethynyl-7-(4-(4-methylstyryl)styryl)-9,9-dioctyl-9H-fluorene] (P4), and poly[2-ethynyl-7-(4-(4-methylstyryl)styryl)-9,9-didodecyl-9H-fluorene] (P5), were designed and prepared using [Rh(nbd)Cl]2 as the catalyst. Their structures and properties were characterized and evaluated by FTIR, NMR, UV, FL, GPC and TGA analyses. The optical limiting properties were investigated using 450 fs laser pulses at 780 nm. These results show that the incorporation of styryl/stilbene functionalized polyfluorenylacetylenes has endowed resultant polyacetylenes with novel near-infrared laser protection properties and enhanced thermal stability. The optical limiting mechanism for laser protection was studied. It was found that the optical limiting properties mainly originated from two-photon absorption (TPA) of molecules in the resulting polyacetylenes. Additionally, it was also found that the functionalized polyacetylene with a longer fluorene-based conjugated chromophore and a stronger terminal electron acceptor group exhibits better optical limiting properties because of the larger π-electron delocalization and dipolar effect.