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Upstream product

• 357219-52-4 4-[(1E)-2-[4-(dihexylamino)phenyl]ethenyl]benzaldehyde 
• 771577-73-2 2-(4-bromomethylphenyl)-4,4,5,5-tetramethyl-[1,3]dioxolane 
• 51359-78-5 4-(bromomethyl)benzaldehyde 
• 90134-07-9 4[(E)-2-(4-bromophenyl)vinyl]-N,N-dihexylaniline 
• 90133-80-5 4-formyl-N,N-dihexylaniline 
• 4430-09-5 N,N-dihexylaniline 
• 670274-17-6 4,4,5,5-tetramethyl-2-(para-methyldiethylphosphonatephenyl)-1,3-dioxolane 
• 81172-89-6 terephthalaldehyde mono(diethylacetal) 
• 125734-44-3 4-(hydroxymethyl)benzaldehyde diethyl acetal 

Relevant academic research and scientific papers

Star-shaped push-pull compounds having 1,3,5-triazine cores

The 1,3,5-triazines 9-11 having OPV chains in the 2-, 4- and 6-position represent star-shaped compounds which exhibit strong push-pull effects. Their long-wavelength absorption S0 → S1 is characterized by an intramolecular charge tra

Two-photon absorption in three-dimensional chromophores based on [2.2]-paracyclophane

A series of α,ω-bis donor substituted oligophenylenevinylene dimers held together by the [2.2]-paracyclophane core were synthesized to probe how the number of repeat units and through-space delocalization influence two-photon absorption cross sections. Specifically, the paracyclophane molecules are tetra(4,7,12,15)-(4′-dihexylaminostyryl)[2.2]paracyclophane (3R D), tetra(4,7,12,15)-(4″-(4′-dihexylaminostyryl)styryl) [2.2]paracyclophane (5RD), and tetra(4,7,12,15)-(4?-(4″- (4′-dihexylaminostyryl)styryl)styryl)[2.2]paracyclophane (7RD). The compounds bis(1,4)-(4′-dihexylaminostyryl)benzene (3R) and bis(1,4)-(4″-(4′-dihexylaminostyryl)styryl)benzene (5R) were also synthesized to reveal the properties of the "monomeric" counterparts. The two-photon absorption cross sections were determined by the two-photon induced fluorescence method using both femtosecond and nanosecond pulsed lasers as excitation sources. While there is a red shift in the linear absorption spectra when going from the "monomer" chromophore to the paracyclophane "dimer" (i.e., 3R → 3RD, 5R → 5RD), there is no shift in the two-photon absorption maxima. A theoretical treatment of these trends and the dependence of transition dipole moments on molecular structure rely on calculations that interfaced time-dependent density functional theory (TDDFT) techniques with the collective electronic oscillator (CEO) program. These theoretical and experimental results indicate that intermolecular interactions can strongly affect Bu states but weakly perturb Ag states, due to the small dipole-dipole coupling between Ag states on the chromophores in the dimer.