High yield synthesis of some phosphonic acid derivatives as surface tethers for energy harvesting technologies
作者:A. Mungalimane
DOI:10.4314/bcse.v28i1.17
日期:——
Efficient synthesis of novel 6-(2-bromo-2-methyl propanoyloxy)hexyl phosphonic acid, dodecane di-phosphonic acid, 6-(thiophene-3-carbonyloxy)hexyl phosphonic acid, octadecyl phosphonic acid and such other derivatives are reported here. These derivatives have a potential application as tethers to nanoparticle surfaces that can promote efficient electron transfer process in solar energy conversion. KEY
Provided is a process for the preparation of certain bisphosphonate compounds and their ester derivatives. In this process certain bisphosphonate compounds such as medronic acid is prepared via the reaction of the corresponding isopropyl esters with (i) trimethylsilylbromide or trimethylsilyl iodide, or (ii) trimethylsilyl chloride and an alkali metal iodide or bromide; followed by treatment with a liquid comprising water. The process surprisingly provides the desired compounds, despite having relatively bulky ester groups such as isopropyl on the starting material bisphosphonate ester.
Organic Thin‐Film Transistors Fabricated by Solution‐Processed and Low‐Temperature Condensed Hybrid Gate Dielectrics
作者:Youngmin Song、Young‐Geun Ha
DOI:10.1002/bkcs.11928
日期:2020.2
Herein, we report on the preparation of new solution‐processed and low‐temperature condensed organic–inorganic hybrid dielectricfilms and their electrical properties for applications in low‐power organic thin‐filmtransistors (OTFTs). The low‐temperature condensed hybrid dielectricfilms (~19 nm thick) were simply fabricated by spin coating a mixture solution of a zirconium chloride and synthesized bifunctional
在此,我们报道了用于低功率有机薄膜晶体管(OTFT)的新型固溶处理和低温冷凝有机-无机混合介电膜的制备及其电学性能。通过旋涂氯化锆和合成的双功能膦酸有机试剂的混合溶液,然后在相对较低的温度下(〜90°C)进行退火,可以简单地制备低温凝结的混合介电膜(约19 nm厚)。制备的混合介电膜表现出优异的介电性能(低漏电流密度<10 -6 A / cm 2和高电容520 nF / cm 2)以及光滑的表面(RMS粗糙度<0.3 nm)。因此,使用这些混合电介质制造并五苯基OTFT,并在相对较低的工作偏压(-2 V)下有效发挥功能,并展现出出色的TFT特性(空穴迁移率:0.3 cm 2 / V / s,低阈值电压:-0.7) V,低亚阈值摆幅:0.17 V / dec,开/关电流比:10 5)。
Microwave MichaelisâBecker synthesis of diethyl phosphonates, tetraethyl diphosphonates, and their total or partial dealkylation
Diethylphosphonates and tetraethyl alkyldiphosphonates were efficiently and rapidly prepared via the Michaelis–Becker reaction, under microwave irradiation. These compounds were then hydrolyzed to phosphonic and diphosphonic acids or selectively monodealkylated to give monoesters of phosphonic acids and symmetrical diethyl esters of diphosphonic acids. These reactions were also achieved rapidly in