186772-82-7

Upstream product

• 67-56-1 methanol 
• 134881-77-9 1,4-bis[2-(2-(2-(2-toluene-p-sulfonylethoxy)ethoxy)ethoxy)ethoxy]benzene 
• 123-31-9 hydroquinone 
• 37860-51-8 tetraethylene glycol di(p-toluenesulfonate) 
• 23783-42-8 tetraethylene glycol monomethyl ether 
• 112-60-7 Tetraethylene glycol 
• 62921-76-0 2,5,8,11-tetraoxatridecan-13-ol tosylate 

Downstream Products

• 775324-81-7 1,4-bis(chloromethyl)-2,5-bis-(2-{2-[2-(2-methoxyethoxy)ethoxy]ethoxy}ethoxy)benzene 

Relevant academic research and scientific papers

Synthesis and physical properties of poly(phenylene vinylene)s having oligo(ethylene oxide) in the side chain

Oligo(ethylene oxide) chains were introduced into the phenyl ring of the poly(phenylene vinylene) (PPV) derivatives to obtain electronic and ionic conductive liquid crystalline PPV derivatives. Thermal decomposition of all PPV derivatives occurred before isotropic melt. A typical texture of the liquid crystalline phase was not shown but birefringence was observed below the thermal decomposition temperature. Exhibition of a smectic phase for the polymers having triethylene or tetraethylene oxide chains was supported by X-ray measurements. Electronic conductivity of the PPV derivatives doped with I 2 and ionic conductivity of the mixture of these polymers and LiClO4 were also discussed.

From p-dimethoxybenzene to crown-benzenophanes, 4: Cation-complexing properties of Bis(p-phenylene-34-crown-10) - A structural and spectrophotometric study

The title compound 2, an electron-rich macrocyclic paracyclophane of the coronand type, known to form a charge-transfer complex with paraquat, was found to encapsulate strontium cations and to bind to magnesium cations. X-ray analysis revealed that 2 forms a 2:1 (metal/substrate) complex with Sr(ClO4)2, in which the two benzene rings weakly overlap, whereas in the single crystals grown from Mg(ClO4)2, the metal cation prefers to lie outside the coronand (1:1 stoichiometry). In acetonitrile solution, cations were observed to trigger an hypsochromic shift of the UV absorption spectra, proportional to their size and charge density. The stoichiometries and binding constants were also determined by UV absorption titration in acetonitrile using the LETAGROP-SPEFO program for several monovalent and divalent cations. For Na+, Ca2+, and Sr2+, 1:1 and 2:1 complexes were shown to be formed. In the free ligand, a weak interaction between the benzene rings was detected by fluorescence decay kinetic analysis, indicating the presence of two conformer populations within the nanosecond time scale. In solution, metal cations neither induce detectable excimer formation nor seem to have a strong influence on the fluorescence emission spectra, except a heavy atom quenching with Sr2+and Ba2+, in contrast to the effect observed in absorption. However, Sr2+ and Mg2+induce a clear hypsochromic shift in the single crystal fluorescence spectra. Compound 2 was prepared by a new and efficient route which is compared to the previous procedures. VCH Verlagsgesellschaft mbH, 1997.