Composite Mesoporous Silica Nanoparticles with Dual-color Afterglow for Cross-correlation-based Living Cell Imaging

Room temperature phosphorescence (RTP) materials are characterized with emission after removing the excitation source. Such long-lived emission feature possesses great potential in biological fluorescence imaging because it enables a way regarding temporal dimension for separating the interference of autofluorescence and common noises typically encountered in conventional fluorescence imaging. Herein, we constructed a new type of mesoporous silica nanoparticles (MSNs)-based composite nanoparticles (NPs) with dual-color long-lived emission, namely millisecond-level green phosphorescence and sub-millisecond-level delayed red fluorescence by encapsulating a typical RTP dye and Rhodamine dye in the cavities of the MSNs with the former acting as energy donor (D) while the latter as acceptor (A). Benefiting from the close D-A proximity, energy match between the donor and the acceptor and the optimized D/A ratio in the composite NPs, efficient triplet-to-singlet Förster resonance energy transfer (TS-FRET) in the NPs occurred upon exciting the donor, which enabled dual-color long-lived emission. The preliminary results of dual-color correlation imaging of live cells based on such emission feature unequivocally verified the unique ability of such NPs for distinguishing the false positive generated by common emitters with single-color emission feature.     

N-甲基苯胺、二苯胺与质子受体相互作用的研究

测量了N-甲基苯胺、二苯胺与一些极性非质子溶剂（B）在CCl_4中的红外光谱，观察到这两种劳胺均与所研究的质子受体发生了氢键交叉缔合作用，并利用光谱数据计算了相应缔合物的形成常数和部分氢键能．结果表明，二苯胺是比N-甲基苯胺更强的质子供体，非质子溶剂的极性、空间效应和不同成键原子对交叉缔合物的稳定性均有一定的影响．还从分子结构对有关结果进行了讨论.     

铁,钴,铜酞菁／Y型分子筛的制备,表征及催化苯酚羟化的研究

制备了铁，钴，铜酞菁／Ｙ型发子筛，利用元素分析，ＩＲ、ＵＶ－Ｖｉｓ，ＴＧ、ＢＥＴ及ＸＲＤ确定了分子筛笼中铁，钴，铜酞菁化合物的生成及其晶体结构，考察了实验参数对苯酚的转化率及产物选择性的影响。     

Reductive Coupling Reaction of Carbonyl Compounds In a TiCl4/Ga Bimetal Redox System

For about 20 yeers the chemisty of low-valent titanium complexes has received great attention¹ and now many of the reactions involving them are commonly used in synethesis². The reactivity, of the low-valent titanium slurries, obtained after reduction of titanium trichloride or titanium tetrachloride by means of strong reducting agents such as magnesium, zinc in tetrahydrofuran has also been studied^3-4. In 1995,we reported that carbonyl compounds react with ethyl trichloracetate and iodoacetonitrile in a PbCl₂/Ga bimetal redox system⁵. Herein, we report reductive coupling reaction of carbonyl compound to afford E-alkenes with TiCl₄/Ga bimetal redox system. Simplicity of produre and moderate to excellent yields of product.     

微波在柴油机滤烟器催化再生中的应用 Ⅰ.滤烟器在氮气中的微波加热温升行为

利用柴油机台架装置及微波加热装置考察了柴油机催化滤烟器的微波加热温升效应． 结果表明,过滤体上捕集的烟碳量对催化滤烟器在氮气中的微波加热温升至关重要,烟碳量的微小增加,可引起滤烟体温度的显著升高． 另外,当微波加热过程中隔离氧气时,滤烟体上出现了明显的金属氧化物催化剂被碳还原的现象．     

3, 6-二取代-均三唑并[3, 4-b]-1, 3, 4-噻二唑的合成

研究了2-苯基-1, 2, 3-三唑-4-羧酸(1)与3-烷基/芳基-4-氨基-5-巯基-1, 2, 4-三唑(2a～o)在POCl~3催化下, 脱水缩合得到15个新的3-烷基/芳基-6-(2'-苯基-1', 2', 3'-三唑-4'-基)均三唑并[3,4-b]-1, 3, 4-噻二唑类化合物(3a～o)。     

Atom Transfer Radical Polymerization of Methyl Methacrylate with α,α-Dichlorotoluene or α,α,α-Trichlorotoluene as Initiator

lnAtomTransferRadicalPolymerization(ATRP),whichisanew"living"/contr0lledradicalp0lymerizati0ntechniquedevel0pedindependentlybyMatyjaszewskieIallandSawam0t0eIaP,anyalkyIhalidewithactivatedsubstituents0na-carbonsuchasaryl,carb0nyl0rallylcanbeusedasinitiatoe.Benzy1haIideandpolymerswithbenzylhalideendgr0upwerereportedtobeefficientinitiator0rmacroinitiatorfortheATRPofstyrene".H0wever,whenbenzylhalidewasusedt0initiateMMAp0Iymerization,itwasfoundthattheinitiationefficiencywasveryIowinourlabo…     

盐酸羟胺的间接分光光度法测定

拟定了在铁（Ⅲ）—２－［２－（６－甲基苯并噻唑）偶氮］－５－二乙氨基苯甲酸（６ＭｅＢＴＡＥＢ）络合物和十二烷基硫酸钠存在下盐酸羟胺的间接分光光度测定方法,回收试验表明该法准确可靠,方便快捷。同时测定了盐酸羟胺与Ｆｅ（Ⅲ）－６＿Ｍｅ＿ＢＴＡＥＢ络合物的反应比。     

聚对苯二甲酸乙二酯/蒙脱土纳米复合材料的制备和性能

讨论了聚对苯二甲酸乙二醇酯（ＰＥＴ）／层状硅酸盐（蒙脱土）纳米复合材料的制备技术和新材料的结构与性能特征．天然蒙脱土矿物经有机离子修饰剂处理后,参与ＰＥＴ的缩聚反应．ＴＥＭ测定证实蒙脱土在ＰＥＴ中的层厚分布为３０～５０ｎｍ．蒙脱土不影响ＰＥＴ的分子量及其分布．利用ＤＳＣ、ＷＡＸＤ、ＳＡＬＳ和偏光显微镜测定了ＰＥＴ／蒙脱土的结晶速率和结晶形态,说明ＰＥＴ／蒙脱土有着很快的结晶速率,不能生成球晶结构,一般只能生成结构不完整的微晶体．ＰＥＴ／蒙脱土在工程塑料和工业纤维领域有潜在的应用前景