氢键和π-π诱导的二维双层Zn(Ⅱ)配位聚合物的晶体结构和荧光性能

本文以间苯二吡啶(1,3-dpb)和4,4′-二苯醚二甲酸(H2oba)为配体,溶剂热合成了一个二维锌配位聚合物{[Zn(oba)(dpb)].H2O}n(1),对其进行了红外,热重,粉末单晶衍射等表征,配合物属于三斜晶系,空间群C2/c。相邻的Zn(Ⅱ)离子通过连接oba2-和dpb形成二维波浪形面,两个相邻的面相互互锁形成2D→2D的结构,并且面与面之间存在氢键。两组2D→2D的结构通过π-π作用进一步形成双层的二维超分子网络。此外,本文也研究了配合物的荧光性能。     

原子荧光光谱法测定镉锭中锡的含量

采用氢化物发生-原子荧光光谱法测定镉锭中锡含量,研究了基体镉对锡的干扰及消除方法,优化了氢化物的发生条件,建立了镉锭中锡含量的快速分析方法。实验证明,原子荧光光谱法对锡的检出限为0.08mg/kg,回收率为99.0%～104.0%,方法准确、可靠,用于日常样品分析,取得了很好的效果。     

掺氮高荧光碳点的一步法制备及对痕量Hg(Ⅱ)离子的选择性检测

采用一步水热法制备了一种水溶性的、具有良好荧光性能的掺氮碳量子点(N-碳点),其尺寸大小均匀,约为7 nm。N-碳点的荧光强度随N的掺杂量、水热反应温度、溶液的pH值而改变。在最佳反应条件下所制备的N-碳点的荧光量子产率高达24.4%。该N-碳点作为一种简单、低成本的荧光探针用于检测痕量Hg²⁺,具有高选择性和高灵敏度的特点,其最低检测极限可达到0.02 μmol·L^-1 (4.012 ng)。     

以1，4-二硝基苯甲酸及邻菲啰啉为配位的镧系金属配位聚合物的合成、结构及性质研究

以1,4-二硝基苯甲酸（HL）和1,10-邻菲罗啉（phen）为配体,通过水热法与镧系金属盐合成了7个一维链状配位聚合物,其分子式为[Ce₂L₆（phen）₂]_n（1）和[LnL₃phen]_n（Ln=Sm,2;Eu,3;Gd,4;Tb,5;Dy,6;Er,7）。由X-射线单晶衍射测定了化合物晶体结构,通过磁性以及荧光测试表征了部分化合物的磁性和荧光性质。     

外围由小分子修饰的树枝状聚酰胺的合成及其荧光性能研究

合成了1－5代外围由小分子荧光体修饰的树枝状聚酰胺，通过红外，紫外，核磁等表征了其结构，并对其荧光性能进行了研究，修饰后的固体产物的荧光较修饰前粘稠体产物的荧光强得多，树枝状高分子荧光受组分比，代数，溶液浓度，溶剂等因素的影响，有机硅对树状高分子的端氨基与3，5二羟基苯甲酸按1／1摩尔比反应时，其产物荧光最强，对于端氨基与3，5－二羟基苯甲酸摩尔比为1／1的不同代树枝状聚酰胺而言，2代产物荧光最强。     

液相色谱荧光衍生法在糖类物质分析中的应用

介绍了目前在液相色谱荧光衍生法分析糖类物质中常用的几类荧光衍生试剂及相应的衍生方法,对近期糖类物质分离分析中的液相色谱荧光检测方法做了系统综述。引用文献60篇。     

Trace enrichment and HPLC analysis of polycyclic aromatic hydrocarbons in environmental samples,using solid phase extraction in connection with UV/VIS diode-array and fluorescence detection

Summary Both the separation of polycyclic aromatic hydrocarbons (PAH's) on tailor made HPLC phases, and their chromatographic enrichment and quantitative determination are of great interest. Because of the generally low concentrations of PAH's in the environment, and the low limiting values in German legislation for drinking water, methods for selective enrichment and sensitive detection are indispensable. On account of their relatively high amounts in soil, the determination of PAH's is valuable for the assessment of the potential danger to ground water by waste materials. These requirements can be fulfilled by used of solid phase extraction on enrichment columns, and fluorescence or UV/VIS diode array detection. For the detection of PAH's in the picogram range, the wavelengths for excitation and emission were time programmed over the chromatogram. With this feature, it is possible to detect all the individual compounds at the highest sensitivity, over the entire analysis.     

PHOTOPHYSICAL STUDIES ON ORGANIC COMPOUNDS——TIME-RESOLVED TRANSIENT ABSORPTION SPECTRA STUDIES ON TRIPHENYLAMINE IN VARIOUS SOLVENTS

The transient absorption spectra of triphenylamine (TPA) in various solvents have beeninvestigated by the methods of nanosecond laser photolysis. The lifetimes of TPA were meas-ured. In hexane and ethanol, the transient absorptions of triplet state and triplet excimer ofTPA were observed. However, the transient absorptions of the TPA cation radical was alsoobserved in acetonitrile besides that of the triplet TPA monomer and excimer. According tothe experimental facts, the transient photophysical mechanism of TPA in various solvents hasbeen proposed.     

Influence of axial coordination on the photophysical property of excited state of zinc porphyrin

The phenomenon that metalloporphyrins are coordinated to axial ligands is very common especially in green-plant and photosynthetic bacteria, where such coordination impacts a signifi-cant effect on both the primary charge separation in the reaction center and energy transfer in an-tenna systems[1]. In addition, it plays a key role in photodynamic therapy and medicine synthesis in a sense that some metalloporphyrins have been assembled by coordination bonds to anti-cancer drugs, enhancing the se…     

树脂预分离氢化物-原子荧光光谱法测定水中的As(Ⅲ)和As(Ⅴ)

建立了As(Ⅲ)、As(V)的树脂分离 氢化物 原子荧光光谱分析方法。利用717阴离子交换树脂选择性的吸附水中的As(Ⅴ),从而实现了对水样中As(Ⅲ)和As(Ⅴ)的分离。考察了溶液的pH和流速以及洗脱剂浓度等条件对分离效果的影响,同时研究了仪器的工作条件、KBH4质量浓度和介质浓度对砷原子荧光强度的影响,并对测定砷时共存离子的干扰和消除进行了探讨。在最佳工作条件下,砷的检出限为0.096μg L,相对标准偏差为2.1%,将该方法应用于水样分析,其回收率为94.7%～107.9%。