芴类化合物的研究新进展

芴及其衍生物是一类重要的具有刚性平面联苯结构的化合物,分子内含有较大的共轭体系,这种特殊的刚性稠环结构使芴类化合物表现出许多独特的光电性能及生物活性,在光电材料、医药等多领域具有潜在的广泛应用.更为重要的是芴类化合物易于进行结构修饰,在芴环上可方便地引入各种功能基,芴类衍生物的合成及其开拓芴类化合物潜在的新用途,成为近些年来十分活跃的研究领域,且发展迅速.结合自己的工作,参考国内外文献,全面综述了芴类化合物在有机电致发光材料、双光子吸收材料、光致变色材料、太阳能电池材料和生物医药等领域的研究与开发新进展,并对其发展趋势作了展望.     

三苯基咪唑类化合物的合成及其紫外、荧光性质研究

设计合成了四种三苯基咪唑类化合物:4,5-二苯基-2-对甲酰基苯基咪唑(2a),4,5-二(2-硝基苯基)-2-对甲酰基苯基咪唑(2b),N-苄基-4,5-二苯基-2-对甲酰基苯基咪唑(2c)和N-苄基-4,5-二(2-硝基苯基)-2-对甲酰基苯基咪唑(2d),并用FT-IR,NMR和MS进行结构表征.在乙酸乙酯-石油醚溶液中获得了2c的单晶,用X射线单晶衍射法测定了其晶体结构,晶体属于三斜晶系,空间群P1,晶胞参数a=0.73796(15)nm,b=0.90136(18)nm,c=1.6644(3)nm,α=86.87(3)°,β=78.25(3)°,γ=89.94(3)°,V=1.0822(4)nm3,Dc=1.272g/cm3,Z=2,F(000)=436,μ=0.077mm-1,R1=0.0459,wR2=0.1303.研究了四种化合物的紫外与荧光性质,发现官能团硝基与苄基的引入,对其吸收峰和发射峰均有不同程度的影响:在紫外光谱中两种官能团均使吸收峰蓝移;在荧光光谱中苄基使发射峰蓝移而硝基使发射峰红移.测定了2a和2c在不同溶剂中的荧光寿命,其中2a在DMSO中寿命最长,为3.18ns.这些光谱性质为研究其双光子吸收、双光子荧光和非线性光学性质奠定了理论和实验基础.     

高效液相色谱指纹图谱应用于板蓝根的鉴定

利用高效液相色谱建立了板蓝根的色谱指纹图谱。采用反相C18柱，流动相为水：甲醇（V/V=96：4），检测波长为260nm；流速1.0mL/min进行试验。根据相对保留值a和相对面积Sr对色谱指纹图谱进行分析对比研究，建立了一个快速、简易鉴别板蓝根样品的色谱指纹图谱分析方法。该法为中药样品的鉴定提供了较全面的信息，并为HPLC在复杂组分的样品分析和鉴别领域开拓了新的应用。     

Photophysical Properties and Photoinduced Electron Transfer between[60]Fullerene—containing Cyclic Sulphoxide [C60—C60H8SO]and Tetrathiafulvalene（TTF） by Laser Flash Photolysis

Photoinduced electron transfer(PET) processes between C60-C6H8SO and Tetrathiafulvalene(TTF) have been studied by nanosecond laser photolysis.Quantrm yiekds(φet) and rate constants of electron transfer(ket) from TTF to excited triplet state of[60] fullerene-containing cyclic sulphoxide in benzonitrile(BN) have been evaluated by observing the transient absorption bands in the NIR region.With the decay of excited triplet state of [60]fullerene-containing cyclic suplhoxide,the rise of radical anion of [60]fullerene-containing cyclic sulphoxinde is observed.     

C60富勒烯-哌啶硫代荒酸酯稠合体的合成与三线态特征

C₆₀富勒烯与2-(哌啶-硫代荒酸酯)-1,3-丁二烯通过Diels-Alder环加成反应得到C₆₀富勒烯-哌啶硫代荒酸酯稠合体,运用现代波谱技术等确定了产物结构;用半经验方法PM3和AM1计算预测环加成反应性和C₆₀富勒烯-哌啶硫代荒酸酯稠合体的性能.激光光解时间分辨技术初步探究了单加成的C₆₀富勒烯-哌啶硫代荒酸酯稠合体(C₆₀-PX)三线态特征以及与四-(2-噻吩基)-四硫富瓦烯(TT-TTF)分子间的光诱导电子转移反应.     

Enhanced nonlinearity for filamentation in gold-nanoparticle-doped water

We report a universal approach based on the surface plasmon resonances(SPRs) attained in filamentation in water doped with gold nanoparticles for enhancing the nonlinear refractive index. The filament-induced supercontinuum spectrum in water overlaps with SPRs of gold nanospheres, which further leads to a modification on the Kerr nonlinear refractive index. In our experiment, the measured nonlinear refractive index(n_2) in water doped with gold nanoparticles increases by six times, as compared with that in pure water. Such enhancement may be useful for filament-induced nonlinear applications with modest incident intensity.     

基于棒状光子晶体光纤的35W重复频率可调皮秒掺镱光纤激光器

针对激光切片技术缺少重频可调激光光源,设计了一种脉冲平均功率35.4W,脉宽12ps,重复频率300kHz～1MHz可调的高功率掺镱光纤皮秒脉冲激光器。激光器采用全光纤振荡器及预放大系统,配合基于棒状光子晶体光纤的主放大系统,并通过在级联放大中加入声光调制器(AOM)调控重复频率,从而实现重复频率可调的高功率皮秒脉冲输出。激光器振荡器及预放大部分的全光纤设计,相较于空间耦合放大具有光路结构简单、环境稳定性高等特点,有望推动高能量飞秒光纤激光工业化进程,提升其在复杂使用环境的适应性。     

C60及其衍生物非线性光学材料的研究进展

介绍了非线性光学性质的原理以及目前研究的具有这种特殊性质的功能材料的结构特点和应用. C₆₀具有的特殊结构, 使其在众多领域成为了研究的重点. C₆₀本身就具有良好的非线性光学性能, 对其修饰得到的各种衍生物更体现优良的性质, 尤其是目前人们大量研究的富勒烯高分子化功能材料具有非常快速的非线性响应时间. 因此重点介绍了C₆₀及其衍生物的结构、非线性光学原理、性质和国内外最新的研究状况.     

Nonlinear optical properties of 75TeO2－20Nb2O5－5ZnO glasses doped with CeO2

Nonlinear optical properties of 75TeO_2－20Nb_2O_5－5ZnO glasses doped with CeO_2 have been investigated with a self-diffracted time-resolved degenerate four-wave mixing (DFWM) technique at different excitation intensities and lattice temperatures. The DFWM signal exhibits three peaks at higher excitation intensities, where a main peak appears at zero delay time and two rather weak side peaks are located symmetrically at the negative and positive time delay. Due to destructive interferences between the fifth- and third-order polarizations, the line-shape of the main peak around the zero time delay evolves from single peak into a double-peak structure with increasing excitation intensity. Two side peaks emerge at the positive and negative time delay and gradually intensify with increasing excitation intensity or lattice temperature, and their positions are independent of the pulse duration, temperature and excitation intensity, which are attributed to the many-body Coulomb interaction.     

手性相转移催化烷基化研究

手性相转移催化烷基化研究曾和平（华南师范大学化学系，广州５１０６３１）在合成具有重要生理活性天然产物时，立体择选烷基化反应是合成具有特定立体结构的光活性产物的重要步骤之一￣［１］。１９８１年Ｍａｔｓｕｏ报道了２－乙氧羰基环戊酮在氢化钠作用下，以ＤＭＦ...