標(biāo)題：Polyoxometaate-Engineered Nanostructures
報(bào)告時(shí)間：2024年7月19日（星期五） 9:30-10:30
報(bào)告地點(diǎn)：人民大街校區(qū)惟真樓230會(huì)議室
主講人：lra Weinstock
主辦單位：化學(xué)學(xué)院
報(bào)告內(nèi)容簡(jiǎn)介：
Colloid science, and its more recent iteration as a branch of nanoscience, lies at theconceptual interace between molecular svstems and functional solid-state materials. Unlikemolecules, most colloidal structures are not amenable to characterization by single-crvstal X-ravcrystallography, while characterization of their surface features (such as protecting-liganddomains) lies outside the scope of the crystallographic methods used to define bulk phases ofsolidstate materials. As such, proaress in this area reauires a determined focus on theestablishment of reliable structurereactivity relationships. One approach, demonstrated in thepresent talk, is to use cryogenic transmission electron spectroscopy (cryo-TEM) to inyestiaatesoluble metal and metal-oxide nanostructures stabilized by readily imaged (highly electron dense)polytungstate (POM) cluster-anion ligands. The POM ligands simultaneously serve as "leavinggroups" for controlingthe transformations of the metal-nanoparticle ligand shells, and, forexample, guiding their self-assembly into supra-structures capable of host-guest chemistry.1Moreover, POMs can serve as coordinately linked anionic ligands for reactive metal-oxidenanocrystals, giving a new class of nanostructures uniquely positioned between molecularmacroanions and traditional colloids. While metal-oxide nanocrystals (NCs) are hiahlyreactivechallenging obstacles impede the systematic development of their solution-state chemistriesNamely, metal-oxide NCs are highly susceptible to precipitation in water. And, while organicligands impart stability, they block access to catalytically-active NC surfaces and lead to insolubleassemblies, Both these obstacles are overcome by replacing traditional organic ligands bywater-soluble cluster anions, This new family of soluble POM-complexed nanostructures wilbediscussed in the context of our larger vision of bringing reactive metal-oxide NCs into the tractableand flexible realm of solutionstate chemistry.
主講人簡(jiǎn)介：
Ira A.Weinstock教授目前是以色列本古里安大學(xué)無(wú)機(jī)化學(xué)教授。1990年在麻省理工學(xué)院（MIT）獲得博士學(xué)位，與Richard R.Schrock一起研究炔烴復(fù)分解。此后在新墨西哥州阿爾伯克基的桑迪亞國(guó)家實(shí)驗(yàn)室工作了一年后，在威斯康星州麥迪遜的美國(guó)農(nóng)業(yè)部擔(dān)任組長(zhǎng)，在那里開(kāi)始使用多金屬氧酸鹽作為綠色催化劑，用于水中生物量的好氧氧化。
