861906-15-2

Upstream product

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• 531504-78-6 [(2,5-dimethoxyphenyl)ethynyl]trimethylsilane 
• 186134-38-3 2-bromo-5-iodo-4-methoxyphenol 
• 174518-82-2 1-bromo-4-iodo-2,5-dimethoxybenzene 
• 98279-45-9 3-iodo-4-methoxyphenol 
• 25245-35-6 1-iodo-2,4-dimethoxybenzene 
• 22944-08-7 2-ethynyl-1,4-dimethoxybenzene 
• 3899-91-0 4-methoxyphenyl p-toluenesulfonate 

Relevant academic research and scientific papers

Rigid molecular architectures that comprise a 1,3,5-trisubstituted benzene core and three oligoaryleneethynylene arms: Light-emitting characteristics and π conjugation between the arms

In view of increasing interest in light-emitting materials, we have investigated the light-emitting characteristics and occurrence of conjugation between arms of star-shaped rigid molecules that comprise a 1,3,5-triethynylbenzene core and methoxy group-su

Light-emitting efficiency tuning of rod-shaped π conjugated systems by donor and acceptor groups

In view of the increasing importance of highly efficient light-emitting materials in chemistry, biological science, and materials science, we investigated the light-emitting efficiency tuning of rod-shaped oligo(p-phenylene ethynylene)s (OPEs, trimeric to pentameric systems) by donor and acceptor groups, so that they emit the very intense fluorescence (Φf ≈ 1.0, log ε ≈ 5) at 460 nm as the desired wavelength region. This goal was achieved by side modification by MeO (donor) groups and end modification by a CN-substituted benzene ring or CF3-substituted pyridine ring (acceptor) of tetrameric p-phenylene ethynylene rod-shaped molecules (Φf = 0.96, λem = 458 nm, log ε = 4.96 for the former and Φf = 0.99, λem = 459 nm, log ε = 4.92 for the latter). The high Φf values for 11 and 12 are interpreted in terms of kr (radiative rate constant) and kd (radiationless rate constant). The linear relationship with a positive slope between Φf and the Hammett σ constant was found for the first time. It is found that kd rather than kr varies with σp-X. The photophysical properties (Φf, λem, λabs, log ε) were not so altered with the solvent polarity, which could be explained by the dipole moments in the excited and ground states. The results would be valuable for the molecular design of highly efficient light-emitting materials. Copyright