激光剥蚀电感耦合等离子体质谱微区分析新进展

从仪器、基础研究诸方面评述近年来LA-ICP-MS微区分析进展,重点介绍了与ICP-MS联用的激光技术发展、校正方法、分馏效应、剥蚀颗粒分布研究及仪器装置与实验技术与改进,对LA-ICP-MS技术的应用作了回顾与展望。     

超氧化物歧化酶邻苯三酚测活法的研究及改进

对目前国内外普遍采用的超氧化物歧化酶邻苯三酚测活法（Marklund法）进行了系统研究。实验表明,该测活性系中缓冲溶液的介质组成、浓度、PH及所含的EDTA量等均对体系测活灵敏度有显著影响。根据条件优选实验,提出了改进新体系,改良后的新方法的测活灵敏度较经典法提高65．5％。     

钐配合物有序分子膜的激光诱导荧光研究

用Langmuir-Blodgett(LB)膜方法组装了可发红色荧光的钐配合物有序分子膜。用时间分辨技术得到了其激光诱导荧光光谱,并分析了荧光光谱的精细结构,计算了有序分子膜中钐离子的能级常数,测定了配合物中心离子的荧光寿命,从分子内及分子间能量转移机理上研究了分子存在状态、膜中组分对钐配合物荧光寿命及能级常数的影响。     

衬底上石墨烯制备及改性研究

大面积高质量石墨烯的制备对石墨烯电子特性及石墨烯基纳器件相关研究有重要意义。本文综述了近几年来衬底上制备石墨烯的相关实验以及衬底与石墨烯相互作用研究的重要进展。目前,采用化学气相沉积、外延生长等方法可在衬底表面上制备出较大面积、高质量的石墨烯材料。衬底与石墨烯相互作用和界面间晶格匹配、原子成键及电荷转移等密切相关,其对吸附石墨烯的几何结构、能带结构及电子特性等产生明显影响。实验与理论计算的结合可望加深衬底与石墨烯作用机理的理解,指导衬底上石墨烯制备及改性的进一步研究。     

Synthesis of δ-carbolines via a Pd-catalyzed sequential reaction from 2-iodoanilines and N-tosyl-enynamines

A facile Pd-catalyzed sequential reaction has been developed for the synthesis of δ-carbolines from 2-iodoanilines and N-tosyl-enynamines. This protocol involves Larock heteroannulation/elimination/electrocyclization/oxidative aromatization cascade sequences and allows access to multisubstituted δ-carbolines in moderate to good yields.     

Nuclear resonance vibrational spectra of five-coordinate imidazole-ligated iron(II) porphyrinates

Nuclear resonance vibrational spectra have been obtained for six five-coordinate imidazole-ligated iron(II) porphyrinates, [Fe(Por)(L)] (Por = tetraphenylporphyrinate, octaethylporphyrinate, tetratolylporphyrinate, or protoporphyrinate IX and L = 2-methylimidazole or 1,2-dimethylimidazole). Measurements have been made on both powder and oriented crystal samples. The spectra are dominated by strong signals around 200-300 cm(-1). Although the in-plane and out-of-plane vibrations are seriously overlapped, oriented crystal spectra allow their deconvolution. Thus, oriented crystal experimental data, along with density functional theory (DFT) calculations, enable the assignment of key vibrations in the spectra. Molecular dynamics are also discussed. The nature of the Fe-N(Im) vibrations has been elaborated further than was possible from resonance Raman studies. Our study suggests that the Fe motions are coupled with the porphyrin core and peripheral groups motions. Both peripheral groups and their conformations have significant influence on the vibrational spectra (position and shape).     

One unprecedented 1-D europium thioindate-thioantimonate based on heterometallic mixed nitro-thioclusters with photoluminescent properties

One novel 1-D europium thioindate-thioantimonate {[Eu(tepa)](2)[μ(2)-SbS(3)](μ(2)-H(2)O)}[Eu(tepa)In(4)S(9)]·0.25tepa (1, tepa = tetraethylenepentamine) has been solvothermally synthesized. 1 represents the first example of the coordination of a soft Lewis basic 1-D polymeric [In(4)S(9)(6-)](n) ligand to a hard Lewis acidic Eu(3+) ion. The wide-band-gap semiconductor and photoluminescence properties of 1 have been investigated.     

Development of three end-capped para-benzoyl calix[4,6, or 8]arene bonded stationary phases for HPLC

Three end-capped para-benzoyl calixarene bonded silica gel stationary phases are prepared and characterized by elemental analysis, infrared spectroscopy, and thermal analysis. The comparison and selectivity of these phases are investigated by using PAHs, disubstituted benezene, and naphthalene positional isomers as probes. Possible separation mechanism based on the different interactions between calixarenes and analytes are discussed. The results indicate that the separation for those analytes are influenced by the supramolecular interaction including π-π interaction, π-electron transfer interactions, space steric hindrance, and hydrogen bonding interaction on the calixarene columns. Importantly, the aromatic probes with polar groups such as -OH, -NO(2), and -NH(2) could regulate the selectivity of calixarene-bonded stationary phases.     

甲苯类化合物的选择性氧化

综述了以O2为清洁氧源甲苯类化合物的气相和液相选择性氧化.甲苯类化合物的气相选择性氧化中主要介绍了金属氧化物、分子筛和负载型催化剂并对影响催化剂活性和选择性的因素进行了分析;甲苯类化合物的液相选择性氧化中重点介绍了MC (mid-century)催化体系及其反应机理方面的研究进展,并特别介绍了仿生催化在甲苯类化合物催化氧化中的应用.对各催化氧化体系的应用前景进行了展望.