436097-07-3Relevant academic research and scientific papers
Structure-function relationship exploration for enhanced thermal stability and electro-optic activity in monolithic organic NLO chromophores
Jin, Wenwei,Johnston, Peter V.,Elder, Delwin L.,Manner, Karl T.,Garrett, Kerry E.,Kaminsky, Werner,Xu, Ruimin,Robinson, Bruce H.,Dalton, Larry R.
supporting information, p. 3119 - 3124 (2016/05/10)
We have developed a series of novel monolithic materials based on molecules previously explored as dopants in guest-host systems to study intrinsic structure-function relationships in organic electro-optic (EO) materials. In a library of EO molecules with varied bridge segments, molecular modification of the donor with bis(tert-butyldiphenylsilyl) groups led to improvement in formation of amorphous films and led to enhanced poling efficiency. Further modification to include a carbazole site-isolation group on the bridge effectively reduced intermolecular dipole-dipole interactions, led to a material with poling efficiency of approximately 3 (nm V-1)2, and an increased glass transition temperature to 20-40 °C higher than similar reported monolithic materials. This level of thermal stability is comparable to common guest/host systems, which incorporated poly(methyl methacrylate) (PMMA) as the host. Our research showed that π-bridge length and type impacted first molecular hyperpolarizability β of a chromophore, which is accordingly reflected in the EO response. These findings further promote the utility of monolithic materials for their increased EO behavior and improved thermal stability, making this material system a competitor of guest-host systems in commercial applications.
Silica-supported HgSO4/H2SO4: A convenient reagent for the hydration of alkynes under mild conditions
Mello, Rossella,Alcalde-Aragonés, Ana,González-Nú?ez, María Elena
scheme or table, p. 4281 - 4283 (2010/09/07)
The silica-supported aqueous-phase catalyst (SAPC) approach has proven convenient for efficiently performing the hydration of alkynes with HgSO 4/H2SO4 to give the corresponding carbonyl compounds in dichloromethane under mild conditions. The use of this solid reagent significantly improves the reaction work-up as it merely involves filtering and evaporating the solvent.
