5447-79-0Relevant articles and documents
Diels-Alder polysulfones as dielectric materials: Computational guidance & synthesis
Lorenzini, Robert G.,Greco, Jordan A.,Birge, Robert R.,Sotzing, Gregory A.
, p. 3573 - 3578 (2014)
Herein, we describe the synthesis and characterization of polymers formed by the Diels-Alder (DA) reaction between various difurans and divinylsulfone, and evaluate their dielectric properties. These syntheses were planned with computational support a priori in the form of HOMO/LUMO calculations for the dienes and dienophiles, with the calculated ΔE for the DA reactions ranging between 9.33 and 9.42 eV. We describe the structure-property relationship observed when changing an atom in the linking unit between two furan rings (-CH2-, -O-, -S-, -NH-) with respect to the dielectric constant and loss tangent. Dielectric constants for the polymers range between 4.96 and 5.98, with dielectric loss tangents ranging from 0.4 to 0.9% at 1 kHz and room temperature. Bandgaps of the polymers are elucidated with UV/Visible spectroscopy, and range from 2.15 to 2.61 eV. The retro DA onset is determined using three analytical methods: thermogravimetric analysis, dynamic scanning calorimetry, and gas chromatography/mass spectrometry polymer desorption spectroscopy, and is determined to be over 125 °C in all cases.
Porous interpenetrated zirconium-organic frameworks (PIZOFs): A chemically versatile family of metal-organic frameworks
Schaate, Andreas,Roy, Pascal,Preusse, Thomas,Lohmeier, Sven Jare,Godt, Adelheid,Behrens, Peter
supporting information; experimental part, p. 9320 - 9325 (2011/10/02)
We present the synthesis and characterization of porous interpenetrated zirconium-organic frameworks (PIZOFs), a new family of metal-organic frameworks obtained from ZrCl4 and the rodlike dicarboxylic acids HO 2C[PE-P(R1,R2)-EP]CO2H that consist of alternating phenylene (P) and ethynylene (E) units. The substituents R 1,R2 were broadly varied (alkyl, Oalkyl, oligo(ethylene glycol)), including postsynthetically addressable substituents (amino, alkyne, furan). The PIZOF structure is highly tolerant towards the variation of R 1 and R2. This together with the modular synthesis of the diacids offers a facile tuning of the chemical environment within the pores. The PIZOF structure was solved from single-crystal X-ray diffraction analysis. The PIZOFs are stable under ambient conditions. PIZOF-2, the PIZOF prepared from HO2C[PE-P(OMe,OMe)-EP]CO2H, served as a prototype to determine thermal stability and porosity. It is stable up to 325°C in air as determined by using thermogravimetry and powder X-ray diffraction. Argon sorption isotherms on PIZOF-2 revealed a Brunauer-Emmett-Teller (BET) surface area of 1250 m2 g-1 and a total pore volume of 0.68 cm3 g-1. Copyright
New strategy for the stereocontrolled construction of decalins and fused polycycles via a tandem diels - Alder ring-opening sequence
Lautens, Mark,Fillion, Eric
, p. 7994 - 7995 (2007/10/03)
-