新型卟啉吡啶季铵盐对铜(Ⅱ)显色反应的研究

研究了在不使用表面活性剂的情况下,新型卟啉吡啶季铵盐溴化5-[4-N-(甲氧基)苄铵基吡啶基]-10,15,20-三(4-N-吡啶基)卟啉对铜(I)的显色反应.结果表明,在pH=1.2时卟啉与Cu2 形成了稳定的配合物,其最大吸收波长为423nm,试剂与Cu2 络合比为1:1,表观摩尔吸光系数为3.24×105L·mol-1·cm-1,铜含量在0-0.8μg/10mL范围内符合比耳定律,该方法应用于环境水样中铜的测定,结果令人满意.     

两种新型卟啉吡啶季铵盐的合成

合成了两种新型卟啉吡啶季铵盐:溴化5-[4-N-(对硝基)苄铵基吡啶基]-10,15,20-三(4-N吡啶基)卟啉和氯化5-[4-N-(对甲氧基)苄铵基吡啶基]-10,15,20-三(4-N-吡啶基)卟啉.这两种化合物尚未见文献报道,它们的结构分别由紫外可见光谱、红外光谱、核磁共振谱、质谱、元素分析得到确证.     

2-(2-喹啉偶氮)-5-二甲氨基酚固相萃取光度法测定锌的研究

研究了新试剂2-(2-喹啉偶氮)-5-二甲氨基酚(QADMAP)与锌的显色反应,在pH 8.5的硼酸-氢氧化钠缓冲介质中,Triton X-100存在下,QADMAP与锌反应生成2∶1稳定络合物,体系最大吸收波长λ_max=590 nm,摩尔吸光系数ε=1.22×105 L·moL-1·cm-1,样品中的锌用强阴离子交换固相萃取柱固相萃取预分离和富集后用该方法测定,结果令人满意。     

2-羟基-4-磺酰氨基苯重氮氨基偶氮苯的合成及与锌的显色反应

在 Triton X- 10 0表面活性剂存在下 ,p H=9.5— 11.5的 Na2 B4O7- Na OH缓冲溶液中 ,2 -羟基 - 4-磺酰氨基苯重氮氨基偶氮苯 (HSDAA)与锌 ( )生成 2∶ 1型深红色配合物。最大吸收峰为 λ=5 30 nm处 ,表观摩尔吸光系数为 1.2 4× 10 5L· mol-1· cm-1。 Zn2 的浓度在 0— 4 80μg/L范围内符合比耳定律。用于测定样品中的微量锌 ,结果满意。     

绿色植被红边特征的研究

通过系统分析绿色植被在紫外可见波段光谱的产生机理,得出绿峰和红边是由叶绿素产生的。从叶绿素的结构上看,它属于卟啉类化合物,为了进一步探究红边产生的机理,合成了四苯基卟啉、四(4-甲氧基苯基)卟啉、四(4-磺酸钠苯基)卟啉、四吡啶基卟啉、四甲基卟啉、四(4-甲氧基苯基)卟啉合锌和四(4-甲氧基苯基)卟啉合铜,并采用紫外可见光谱、红外及核磁进行表征。通过对其紫外可见光谱的系统分析,提出“红边”不仅限于叶绿素,而是卟啉类化合物特有的光谱特征,红边是由卟啉环a_2u(π)-e_g(π*) 跃迁产生的Q带所致。其位置不仅与卟啉的浓度相关,与卟啉化合物外侧取代基类型也有关系,金属卟啉对红边的位置影响较大。     

双亲金属卟啉在SDS胶束中的光谱性质及动力学研究

5,10,15-3(4-羟基酚基)-20-(4-十六烷氧基酚基)卟啉锌(P1Zn)增溶于SDS胶束中,用敏感于微环境变化的紫外-可见光谱,研究了P1Zn在pH正向滴定和逆向滴定过程中Sorer带和Q带的变化与体相pH值的依赖关系。随着pH值由中性变化到强酸性,P1Zn中的锌原子被氢原子取代生成P1,而pH值由强酸性变化到中性,P1中的氢原子并未被锌原子取代生成P1Zn。在中性条件下P1与Zn(Ⅱ)的动力学表明,在pH值变化过程中,其增溶位置可能发生了变化,初步分析了双亲卟啉的结构对于增溶位置的影响。     

绿色植被红边特征的研究（英文）

通过系统分析绿色植被在紫外可见波段光谱的产生机理,得出绿峰和红边是由叶绿素产生的。从叶绿素的结构上看,它属于卟啉类化合物,为了进一步探究红边产生的机理,合成了四苯基卟啉、四(4-甲氧基苯基)卟啉、四(4-磺酸钠苯基)卟啉、四吡啶基卟啉、四甲基卟啉、四(4-甲氧基苯基)卟啉合锌和四(4-甲氧基苯基)卟啉合铜,并采用紫外可见光谱、红外及核磁进行表征。通过对其紫外可见光谱的系统分析,提出"红边"不仅限于叶绿素,而是卟啉类化合物特有的光谱特征,红边是由卟啉环a2u(π)-eg(π*)跃迁产生的Q带所致。其位置不仅与卟啉的浓度相关,与卟啉化合物外侧取代基类型也有关系,金属卟啉对红边的位置影响较大。     

德州市交警发铅水平调查

建立了一种测定交警头发中痕量铅的新方法.研究了在Tween-80存在下,铅与非水溶性试剂meso-四（4-氯苯基）卟啉的显色反应条件,提出了一个高灵敏度测定铅的分光光度法.络合物的最大吸收波长为466nm,组成摩尔比为1∶1,铅含量在0-6μg/10mL范围内有较好的线性关系,表观摩尔吸光系数为1.74×105L·mol-1·cm-1,并将其应用于交警头发中痕量铅的测定.     

在阴离子表面活性剂存在下meso-四-(4-吡啶)卟啉与铅的显色反应

在十二烷基硫酸钠 (SDS)存在下 ,铅与 meso-四 - (4 -吡啶 )卟啉 (TPyr P)进行显色反应 ,生成 1∶ 1络合物 ,最大吸收波长为 4 6 4nm,表观摩尔吸光系数为 1.14× 10 5L· mol-1· cm-1。铅含量在 0— 8μg/ 10 m L范围内有较好的线性关系 ,建立了一个高灵敏度测定铅的分光光度法。用于水样中铅的测定 ,结果令人满意     

4-甲氧基-2-磺酸基苯基重氮氨基偶氮苯的合成及其与汞(Ⅱ)的显色反应

合成了4-甲氧基-2-磺酸基苯基重氮氨基偶氮苯(MOSDAA),并对该试剂与汞(Ⅱ)的显色反应进行了研究.实验表明,在pH 11.5的Na2B4O7-NaOH缓冲溶液中,Triton X-100存在下,该试剂与汞(Ⅱ)形成3:1的红色络合物,其最大吸收波长位于520nm,表观摩尔吸光系数为2.56×105L·mol-1·cm-1,Hg(Ⅱ)在0-14μg/25mL范围内遵守比耳定律.     

Guided-Wave Two-Dimensional Acousto-Optic Scanner Using Proton-Exchanged Lithium Niobate Waveguide

Two-dimensional scanning of a 0.6328 mum guided-light beam has been realized using noncolinear acousto-optic (AO) coplanar Bragg diffraction together with colinear AO guided-mode to substrate radiation-mode conversion in a Z-cut Xpropagation LiNbO3 proton-exchanged (PE) waveguide. The two surface acoustic (SAW) waves utilized are at the center frequencies of 500 and 200 MHz, propagating in the Y and X axes, respectively. Two-dimensional scanning of approximately 720 resolvable light beam spots, namely, 18 40 (horizontal vertical) scanning, has been demonstrated using a light beam of 1.0 mm aperture. The total number of resolvable beam spots can be greatly increased from 720 by simply utilizing SAW transducers of larger bandwidth and a light beam of greater aperture. It should also be possible to significantly increase the diffraction efficiency from 3 % by optimizing the parameters of the PE waveguide and the SAWs.     

Effect ofγ-radiation on the spectral luminescence characteristics of impure cadmium tungstate crystals

Results of a study of the effect of γ-radiation on the spectral luminescence properties of cadmium tungstate crystals doped with silver, bismuth, and molybdenum cations are presented. Spectral characteristics of the nondnnnoped crystals are briefly described. Absorption and photo and X-ray luminescence spectra of the crystals taken before and after exposure to γ-radiation (5.5·10⁴ Gy) are compared. It is found that the spectral characteristics of the crystals doped with silver, bismuth, and molybdenum cations do not change markedly after the exposure. The relation between the type of impurity-induced defects, individual characteristics of the impurity cations, and the character of the effect of γ-radiation on the spectral luminescence properties of impure crystals is analyzed (preliminarily). Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 1, pp. 55–60, January–February, 1997.     

Femtosecond Transform-Limited Pulse Generation by Compensating for the Linear Chirp of SPM Spectra in Dispersion Shifted Fibers

A simple technique of pulse compression, based on the linear chirp compensation of self-phase modulation (SPM) spectra in dispersion shifted fibers, is demonstrated. The optimization procedure is carried out, for a short span of a single-mode fiber, using a parabolic law, which describes the behavior of the squared output pulse width versus the pump peak power in the case of Gaussian pulses. The experimental results give a minimum pulse duration of 233 fs, which is in good agreement with the model. Shorter and coherent pulses, down to 90 fs, have been obtained by inserting an interference filter at the optical output.     

Sorting of bending magnets for the SSRF booster

The Shanghai Synchrotron Radiation Facility(SSRF)booster ring,a full energy injector for the storage ring,is deigned to accelerate the electron beam energy from 150MeV to 3.5GeV that demands high extraction efficiency at the extraction energy with low beam loss rate when electrons are ramping.Closed orbit distortion(COD)caused by bending magnet field uniformity errors which affects the machine performance harmfully could be effectively reduced by bending magnet location sorting.Considering the affections of random errors in measurement,both ideal sorting and realistic sorting are studied based on measured bending magnet field uniformity errors and one reasonable combination of bending magnets which can reduce the horizontal COD by a factor of 5is given as the final installation sequence of the booster bending magnets in this paper.     

Measurement of nonlinear coefficient of optical fiber based on small chirped soliton transmission

We measure the waveform and phase curves of short optical pulses before and after transmission over different lengths of fibers by use of the pulse analyzer with the frequency-resolved optical gating (FROG),and numerically simulate pulse evolution under the experimental conditions.The nonlinear coefficient of the fiber is given by comparing the experimental results with the numerical ones.Difference between the experiment and numerical simulation is analyzed.     

Resonance scattering of canonical elastic shells in absorbing fluid medium

Resonance scattering of elastic spherical shell and cylindrical shell while the surrounding fluid medium has absorption is studied. The normal mode solution derived using exact elastic theory and the separation of variables is still applicable. However, the scattering form function has to be modified for the absorbing medium, otherwise the unreasonable result would be obtained. The backscattering form function in the absorbing medium is redefined, and the form function of elastic spherical and cylindrical shell with vacuum or solid matter filled is calculated in various absorption conditions. The results show that the absorption of surrounding fluid leads to notable attenuation of the coincidence resonances in the mid-frequency, but it has a little influence on the low-frequency resonance scattering induced by the filler inside the shell.     

Single-beam self-referenced phase-sensitive surface plasmon resonance sensor with high detection resolution

A versatile and low-cost single-beam self-referenced phase-sensitive surface plasmon resonance(SPR)sensing system with ultra-high resolution performance is presented.The system exhibits a root-mean-square phase fluctuation of ±0.0028.over a period of 45 min.i.e.a resolution of±5.2×10-9 refractive index units.The enhanced performance has been achieved through the incorporation of three design elements:a true single-beam configuration enabling complete self-referencing so that only the phase change associated with SPR gets detected,a differential measurement scheme to eliminate spurious signals not related to the sensor response,and the elimination of retardation drifts by incorporating temperature stabilization in the liquid crystal phase modulato .Our design should bring the detection sensitivity of non-labeling SPR biosensing closer to that achievable by conventional fluorescence-based techniques.     

Influences of SiO2 protective layers and annealing on the laser-induced damage threshold of Ta2O5 films

Ta2O5 films are prepared on BK7 substrates with conventional electron beam evaporation deposition.The effects of SiO2 protective layers and annealing on the laser-induced damage threshold (LIDT) of the films are investigated.The results show that SiO2 protective layers exert little influence on the electric field intensity(EFI)distribution,microstructure and microdefect density but increase the absorption slightly.Annealing iS effective on decreasing the microdefect density and the absorption of the films.Both SiO2 protective layers and annealing are beneficial to the damage resistance of the films and the latter is more effective to improve the LIDT.Moreover,the maximal LIDT of Ta2O5 films is achieved by the combination of SiO2 protective layers and annealing.     

A stereo matching algorithm using multi-peak candidate matches and geometric constraints

Gray cross correlation matching technique is adopted to extract candidate matches with gray cross correla- tion coefficients less than some certain range of maximal correlation coefficient called multi-peak candidate matches. Multi-peak candidates are extracted corresponding to three closest feature points at first. The corresponding multi-peak candidate matches are used to construct the model polygon. Correspondence is determined based on the local geometric relations between the three feature points and the multi-peak candidates. The disparity test and the global consistency checkout are applied to eliminate the remaining ambiguous matches that are not removed by the local geometric relational test. Experimental results show that the proposed algorithm is feasible and accurate.