115705-51-6Relevant academic research and scientific papers
Substituent effect on redox potential of terephthalate-based electrode materials for lithium batteries
Lakraychi,Dolhem,Djeda?ni-Pilard,Becuwe
, p. 71 - 75 (2018)
The substituent effect on the redox potential of lithium terephthalate was studied using symmetrical dilithium disubstituted-terephthalates incorporating bromo, methoxy and amino groups. All the terephthalate derivatives have been synthesized and evaluated as anode material for lithium-ion batteries. The electrochemical results revealed an increase in the reduction potential in the case of bromo and methoxy groups and almost the same in the case of amino group compared to unmodified dilithium terephthalate. In addition, a very first tendency between the 13C chemical shifts and FTIR signal of the carbonyl and the reduction potential of the studied disubstituted-terephthalates was formulated.
A novel integrated Cr(vi) adsorption-photoreduction system using MOF?polymer composite beads
Kampouri, Stavroula,Mensi, Mounir D.,Nguyen, Tu N.,Queen, Wendy L.,Smit, Berend,Stylianou, Kyriakos,Sun, Daniel T.,Valizadeh, Bardiya
, p. 9629 - 9637 (2020)
Herein, a novel integrated adsorption-photoreduction system, which captures highly mobile and toxic hexavalent chromium (Cr(vi)) from real-world water samples and reduces it to less mobile and benign Cr(iii) species, was designed. To do this, a known Zr-MOF, UiO-66, was functionalized with double amino groups. This modification permits the new material, Zr-BDC-(NH2)2, to play a dual-purpose as both adsorbent and photocatalyst. Next, Zr-BDC-(NH2)2was incorporated into MOF?polymer beads (M?PB) using polyethersulfone (PES) that was chemically modified with carboxylic acid groups to improve hydrophilicity. The modification enhances the Cr(vi) extraction rate of the beads by a factor of ~3 when compared to the unmodified counterpart. In addition, Zr-BDC-(NH2)2?PB offers one of the highest Cr(vi) uptake capacities reported to date, rapid extraction rates, high selectivity for Cr(vi) in real-world water samples, and full recyclability. The adsorption and subsequent regeneration cycles are carried out in a glass column equipped with a visible light source, demonstrating that the Cr(vi) concentration is brought below drinkable levels, and the Cr(vi) subsequently photoreduced to Cr(iii) species using light irradiation during adsorbent regeneration. To the best of our knowledge, this is the first demonstration of MOF-based adsorption-photoreduction of Cr(vi) in a single process.
Synthesis and Electrochemistry of Pyrimidoquinazoline-5,10-diones. Design of Hydrolytically Stable High Potential Quinones and New Reductive Alkylation Systems
Skibo, Edward B.,Gilchrist, James H.
, p. 4209 - 4218 (2007/10/02)
The synthesis of pyrimidoquinazoline-5,10-diones 1 and pyrimidoquinazoline-5,10-diones 2 was carried out in conjunction with the design of both hydrolytically stable high potential quinones and new purine-like reductive alkylators.These systems consist of a benzoquinone ring bearing two fused pyrimidin-4(3H)-one rings.The fused pyrimidinone rings serve to protect 1 and 2 from hydrolysis as well as to raise quinone redox potentials by stabilizing the hydroquinones with internal hydrogen bonds (65 mV increase per hydrogen bond).Synthesis of 1 and 2 involved pyrimidinone ring annelation to a 2,5-diamino-3-nitroterephthalic acid derivative and to a 2,4-diamino-1,5-dicarboxy-3-nitrobenzene derivative, respectively.The synthetic studies provided insights into the electronic effects of nitro and amino groups on the annelation process.
