Si(CH3)3Cl分子电离电势和化学键能的测定

The photoionization spectroscopy of Si(CH3)3Cl in the range of 50 -130 nm was studied with synchrotron radiation source. The adiabatic ionization potentials of molecule Si(CH3)3Cl and radical Si(CH3)3 are 10.06 ±0.02 eV and 7.00±0.03 eV respectively. In addition, the appearance potentials of Si(CH3)2Cl+, Si(CH3)3+, SiCl+ and SiCH3+ were determined:
AP(Si(CH3)2Cl+) ＝10.49±0.02eV, AP(Si(CH3)3+) ＝ 11.91 ±0.02eV
AP(SiCl+) ＝ 18.64 ±0.06eV, AP(SiCH3+)＝ 18.62 ±0.02eV
From these, some chemical bond energies of Si(CH3)3Cl+ were calculated:
D(Si(CH3)2Cl+ - CH3) ＝0.43 ±0.02eV, D(Si(CH3)3+ - Cl) ＝ 1.85 ± 0.02eV
D(SiCH3+ - (2CH3 ＋ Cl)) ＝ 8.56 ± 0．06eV, D(SiCH3+ - 2CH3) ＝6.71±0．06eV
D(SiCl+ - 3CH3) ＝ 8.58 ± 0.06eV, D(SiCl＋- 2CH3) ＝ 8.15 ±0.06eV
D(SiCH3+- (CH3 ＋ Cl)) ＝8.13 ±0.06eV     

壳聚糖季铵盐的合成及结构表征

用异相法合成了水溶性壳聚糖季铵盐衍生物，并用红外光谱及核磁共振谱进行结构表征。结果表明：在中性反应条件下，壳聚糖分子的季铵盐衍生化反应主要发生于亲该中心Ｃ２位的氨基上，所合成的壳聚糖季铵盐衍生物可直接溶解于水。其水溶液可以任意比例与乙醇、丙二醇、甘油等混溶。     

H(Fe)ZSM-5分子筛的合成、表征及其催化性能的研究

用水热法合成出含铁ZSM-5沸石,并对其物相、外貌、结构组成、吸附、表面酸性和催化活性等性能作了测试。ESR和XPS测定结果表明Fe~(3+)进入沸石骨架。实验结果表明,表面总酸性较弱,L酸位浓度较大的H(Fe)ZSM-5在甲醇转化反应中有利于低碳烃的齐聚和异构化,而酸性较强的HZSM-5易使低碳烯烃氢转移而生成大量的气态烃。     

双酚A聚砜链对对苯二酚聚砜链结晶性能的影响

本文报导了双酚A聚砜(B)与对苯二酚聚砜(H)两组份含量不同的嵌段共聚物的X射线衍射结果,B链的加入,使共聚物的结晶性能被破坏,B/H为0.48(摩尔比)时,所得共聚物已呈现出完全非晶相结构的特征.由IGC及DSC实验测定,表明这两种聚砜链是相容的.     

新工科项目“地方(行业)高校化学类专业应对产业变化的升级改造研究与实践”的实施

This "emerging engineering education (3E)" project "Upgrade and Practice of Chemistry-related Majors of Local and/or Specialized University Responding to the Industry Changes" was supported by the Ministry of Education. To aim at the issue of how to upgrade the chemistry-related majors of a local and/or specialized university responding to industry changes, an investigation on local regional economy and industry changes was carried out, the capability requirements of 3E for talents were analyzed, and the training objectives, graduation requirements as well as the new teaching models were also studied for the major to meet the future requirements. The practical experience for 3E construction of chemistry-related majors by selected universities was suggested.     

催化裂化轻汽油及醚化产品的气相色谱分析

1引言催化裂化轻汽油醚化工艺将催化裂化汽油中的叔碳烯烃转化为甲基叔烷基醚,不但可以提高辛烷值,增加含氧量,还可以降低蒸汽压和烯烃含量,因而是生产环境友好汽油的理想工艺。在催化裂化轻汽油醚化工艺的研究过程中,原料与产品需要快速准确的分析手段。本文采用气相色谱／质谱法（GC／MS）结合标准样对照法进行定性,根据采用自制的标准样测定的甲醇和醚类的相对重量校正因子进行定量分析,取得了满意的结果,为试验研究和工业生产提供了一种快速准确的分析方法。2实验部分2．1仪器与试剂MAT90型GC/MS联用仪（德国菲尼根公司）…     

脱水KFI沸石中钾离子分布的模拟退火研究

基于四个固定的参量设值：阳离子位能差E_M2-E_M1=25.50 kJ/mol、 E_M3-E_M1=-10.73 kJ/mol和最近邻阳离子对互作用能W₁₂=45.6 kJ/mol、 W₁₄=0.56 kJ/mol以及一个温度依赖的参量E_M4-E<     

尖吻蝮蛇蛇毒中纤溶组分与铽的相互作用

利用平衡析,原子吸收,荧光滴定和荧光寿命测定等方法确定了皖南尖吻蝮蛇蛇毒纤溶组分中Ｃａ＾２＋含量,并利用荧光光谱研究了Ｔｂ＾３＋与ＦＰ中色氨酸残基之间能量转移和ＦＰ中的微区结构。     

Lutidine‐Based Chiral Pincer Manganese Catalysts for Enantioselective Hydrogenation of Ketones

A series of Mn^I complexes containing lutidine‐based chiral pincer ligands with modular and tunable structures has been developed. The complex shows unprecedentedly high activities (up to 9800 TON; TON=turnover number), broad substrate scope (81 examples), good functional‐group tolerance, and excellent enantioselectivities (85–98 % ee) in the hydrogenation of various ketones. These aspects are rare in earth‐abundant metal catalyzed hydrogenations. The utility of the protocol have been demonstrated in the asymmetric synthesis of a variety of key intermediates for chiral drugs. Preliminary mechanistic investigations indicate that an outer‐sphere mode of substrate–catalyst interactions probably dominates the catalysis.     

Rational Design of a Two‐Photon Fluorogenic Probe for Visualizing Monoamine Oxidase A Activity in Human Glioma Tissues

Monoamine oxidases have two functionally distinct but structurally similar isoforms (MAO‐A and MAO‐B). The ability to differentiate them by using fluorescence detection/imaging technology is of significant biological relevance, but highly challenging with available chemical tools. Herein, we report the first MAO‐A‐specific two‐photon fluorogenic probe ( F1 ), capable of selective imaging of endogenous MAO‐A enzymatic activities from a variety of biological samples, including MAO‐A‐expressing neuronal SY‐SY5Y cells, the brain of tumor‐bearing mice and human Glioma tissues by using two‐photon fluorescence microscopy (TPFM) with minimal cytotoxicity.