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1.
本文研究了溴化5-[4-(4-吡啶丁氧基)苯基]-10,15,20-三苯基卟啉与Cu2+的显色反应条件,络合物最大吸收波长为414nm,试剂(H4P2+)最大吸收波长为446nm。对比度为32nm,试剂与铜络合比为1∶1,表观摩尔吸光系数为2.5×105L·mol-1·cm-1,铜含量在0.2—1.0μg/10mL内符合比耳定律,可用于痕量铜的测定。  相似文献   

2.
为了改善卟啉显色剂对金属离子选择性较差的缺点,新合成了不同链长尾式卟啉--三乙胺季铵直力吡季铵盐六种化合物,对新化合物进行元素分析,确定其组成,用NMR和IR研究其化合物的结构,并讨论六种化合物核磁共振谱关系特征及其规律。  相似文献   

3.
一种新型尾式卟啉吡啶季铵盐对锌离子显色反应的研究   总被引:2,自引:0,他引:2  
本文研究了一种新型尾式卟啉吡啶季铵盐5-「4-(4-吡啶丁氧基)苯基」-10,15,20-三(4-氯苯基)卟啉溴化物与锌的反应条件。PH=10.0,在吡啶存在下于沸水浴中加热15min,其与Zn^2+形成1:1配合物,其最大吸收波长位于428.6nm,在此条件下试剂的最大吸收波长在418.2nm,相差10nm,配合物摩尔吸光系数4.64×10^5L·mol·cm^-1,锌在0-1.2μg/10mL  相似文献   

4.
一种新尾式卟啉吡啶季铵盐对锌离子显色反应的研究   总被引:1,自引:0,他引:1  
本文研究了一种新型尾式卟啉吡啶季铵盐5-[4-(4-吡啶丁氧基)苯基]-10,15,20-三(4-氯苯基)卟啉溴化物与锌的反应条件。pH=10.0,在吡啶存在下,于沸水浴中加热15min,其与Zn2+形成1∶1配合物,其最大吸收波长位于428.6nm,在此条件下试剂的最大吸收波长在418.2nm,相差10nm,配合物摩尔吸光系数4.64×105L·mol-1·cm-1,锌在0—1.2μg/10mL范围内符合比耳定律,相关系数r=0.9888,本法是目前报道的分光光度法测定锌的最灵敏方法之一。  相似文献   

5.
新型卟啉吡啶季铵盐与铜(Ⅱ)显色反应的研究   总被引:2,自引:0,他引:2  
本文研究了在不使用表面活性剂情况下,新型卟啉试剂溴化5-[4-(4-吡啶丁氧基)苯基]-10,15,20-三(4-甲氧基苯基)卟啉与铜(Ⅱ)的显色反应。结果表明,pH=5-7时,铜(Ⅱ)与此卟啉形成了稳定配合物,其表观摩尔吸光系数为2.37×105L·mol-1·cm-1,铜浓度在0-1.2μg/10mL范围内服从比耳定律。配合物组成的摩尔比为Cu∶卟啉吡啶季铵盐=1∶2,本方法应用于环境水样中铜的测定,结果满意  相似文献   

6.
研究了三种新型不同链长尾式卟啉 -吡啶季铵盐与Cu2 的显色反应条件 ,其络合物最大吸收波长分别为 4 13nm(Ⅰ ) ,(Ⅱ ) ;4 14nm(Ⅲ )。在相同条件下 ,试剂最大吸收波长分别为 4 4 3 5nm(Ⅰ ) ;4 4 4nm(Ⅱ ) ;4 4 6nm(Ⅲ )。对比度大约 30nm。试剂与铜络合比均为 1∶1,表观摩尔吸光系数为 (Ⅰ ) 3 4× 10 5,(Ⅱ )2 9× 10 5;(Ⅲ ) 2 5× 10 5L·mol-1·cm-1,铜含量分别在 (Ⅰ ) 0~ 0 5 μg·( 10mL) -1;(Ⅱ ) 0~ 0 6 μg·( 10mL) -1;(Ⅲ ) 0~ 1 0 μg·( 10mL) -1内符合比尔定律 ,可用于痕量铜的测定。  相似文献   

7.
测量了c轴高度定向的YBa2Cu3O7-δ高Tc超导薄膜经300~750℃退火后的红外反射光谱和不同掺Zn量的YBa2Cu3-xZnxO7-δ块状材料的红外吸收光谱。根据这些光谱中Cu-O吸收峰的变化,证实了在YBa2Cu3O7-δ体系的红外光谱中,630cm^-1、590cm^-1、和550cm^-1三个吸收峰分别对应的Cu-O伸缩振动膜,以及与氧缺位的关系。并讨论了二维电子气屏蔽对吸收峰的影响  相似文献   

8.
张志华 《光谱实验室》2007,24(2):206-208
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.  相似文献   

9.
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.  相似文献   

10.
本文合成了4种新的N-甲基麻黄素或奎宁手性季铵盐-卟啉化合物,并用元素分析、红外光谱、紫外-可见光谱、核磁共振谱、质谱确定了其结构.  相似文献   

11.
Using cis-1,4-polyisoprene as an example, the influence of the conformation and orientation of the polymer chain on its polarization absorption spectra has been simulated. It has been shown that if a change in the orientation of the polymer chain leads to a monotonic change in the intensities of the absorption bands with their maxima positions remaining unchanged, then changes in the polymer chain conformation additionally cause a shift and the appearance of new absorption bands. According to the results of the calculation of the vibrational spectra, the inversion of the IR dichroism of the absorption bands of polymers is associated with the conformation transition. We simulate the influence on the IR absorption spectrum of the degree of crystallinity of cis-1,4-polyisoprene, in which the amorphous and amorphous-crystalline states are considered as a mixture of noninteracting polymer chains, where each state is characterized by a certain ratio of conformers. Likewise, the changes in the IR absorption spectrum of cis-1,4-polyisoprene under its stretching have been investigated. __________ Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 72, No. 6, pp. 727–733, November–December, 2005.  相似文献   

12.
Optical spectroscopy techniques, including visible and near infrared (IR) Raman and synchrotron IR methods have been applied to study solid nitrogen at megabar pressures. We find that nitrogen becomes totally opaque above 150 GPa, accompanied by the disappearance of Raman and IR vibrational excitations, while new broad IR and Raman bands become visible. Optical absorption measurements reveal that the semiconducting absorption edge responsible for the change of color is characterized by the presence of a wide Urbach-like tail and a high-energy (Tauc) region. These data are consistent with the dissociation of molecular nitrogen into a nonmolecular (possibly amorphous) phase.  相似文献   

13.
几种车前草二维红外相关光谱的分析研究   总被引:1,自引:0,他引:1  
采用二维相关红外技术,并借助于变温过程所跟踪的动态光谱进行分析研究,分析鉴别了来自不同地区的车前草。对不同地区车前草的峰位、峰形、峰强进行比较,可知它们的一维谱图没有明显的区别,而二维相关谱图中,异步图差异比较明显。凭借二维红外相关谱上的自动峰和交叉峰可以较直观的鉴别不同产地的车前草,而且还可以揭示其两者相应各官能团的变化规律。该法快速、准确,可作为中药材鉴定提供一种方法和手段。  相似文献   

14.
《光谱学与光谱分析》2016,(9):3033-3038
The UV-Vis and infrared(IR)absorption spectra of organophosphorus(OP)pesticides have been studied.A correlation in spectra was developed to optimize the OP pesticides in the environments.The spectroscopic(UV-Vis and IR)spectrum of OP pesticides like methyl parathion,malathion and parathion has been interpreted in detail.A complete calculation of the normal frequencies and absolute intensities of UV-Vis and IR absorption bands are interpreted with the help of corresponding experimental data.In the colorimetric reactions,the bands appear at 2 077,1 637,1 455,1 015,655cm~(-1) for malathion;2 081,1 639,1 316,1 015,794,683cm~(-1) for parathion;2 078,1 632,1 032,794cm~(-1) for methyl parathion were used for quantitative or qualitative analysis.All these IR spectra were acquired by averaging 100 scans at a resolution of 4cm~(-1).It is determined experimentally in the region 200~450nm for UV-Vis absorption bands and in the region 400~4 000cm~(-1) for IR absorption bands.It is concluded that the mainly optically active groups(P—OH, C=O,P=O, C—O—C,P—O—C, P=S, —OH)present in pesticides which are responsible in change in significant data for quantitative and qualitative analysis.The various optical properties like wavelength,band energy,wave number,and frequency,also are calculated.  相似文献   

15.
The rubber crush drier exhaust contains mainly styrene, ethylbenzene, cumene, diizopropylbenzene, alkylphenols, monocyclic terpenes and technological additives as stearic acid, oils an colophony. For possible application of d.c. corona discharge to control styrene in exhaust, the reaction of styrene with additives and air in various d.c. corona discharge tubes was studied. The change of styrene content in the gas phase was measured by IR absorption spectrometry. The decrease of styrene concentration was minimum 83% and reached the 98,9% efficiency. No aromatic compounds remain after corona discharge action in gas phase. The structure of solid products was specified with reflection IR absorption spectrometry and compared with a calibration polystyrene foil (300 μm). The main product has been of malein anhydride-styrene copolymer character for a negative corona discharge and of phenol or quinone-styrene copolymer character for a positive corona discharge.  相似文献   

16.
用密度泛函理论的杂化密度泛函B3LYP方法研究了太阳能电池光敏荆5,10,15.三苯基-20-(3,4-二羟基苯)卟啉(卟啉儿荼酚,TPP-cat)的几何结构、电子结构、IR和Raman特性.用自然键轨道方法分析了电荷布居和成键性质.计算结果表明,最强的IR吸收峰位于1175.81 cm-1处,最强的Raman活性位于1587.18 cm-1处.采用含时密度泛函计算了TPP-cat在水溶液中的电子吸收谱,其Soret带和Q带均指认为π→π*跃迁,在大约354 cm-1处的跃迁与一个光诱导分子内电荷转移过程有关.  相似文献   

17.
航天诱变番茄花粉的红外光谱研究   总被引:2,自引:1,他引:1  
应用傅里叶红外光谱(FTIR),测试分析了4种番茄花粉样品的一维红外谱和二阶导数谱.结果表明,番茄花粉富含蛋白质、氨基酸和碳水化合物类成分;航天诱变选育番茄花粉的图谱与普通系统选育花粉的图谱基本类似,但在个别峰位处发生了变异.2种航天诱变选育花粉产生的共同变异是CH3和C-O振动峰增强;不同的是大小番茄航天诱变选育花粉分别在酰胺Ⅰ带和酰胺Ⅱ带处的吸收增加.  相似文献   

18.
The change with thermal annealing of the diffuse-reflection and luminescence spectra of electron irradiated polycrystalline zinc oxide was investigated. It was found that the absorption band of F and F±centers increased at T<543°K and decreased at high temperatures. The change in the parameters of the exciton luminescence bands correlates with the change of absorption in the F and F±bands. Absorption in the band of interstitial zinc ions decreases over the whole range of annealing temperatures. The effect of thermal annealing on the absorption in the near IR range of the spectrum was investigated. Explanation is given of the regularities established.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 9, pp. 60–65, September, 1985.  相似文献   

19.
FTIR光谱法与奶粉的品质分析   总被引:1,自引:0,他引:1  
采用傅里叶变换红外光谱法(FTIR)获得了11种奶粉产品的红外光谱。奶粉中的主要营养成分在红外光谱中具有明显的指纹特征。同一生产厂家不同品牌的奶粉,其脂肪、蛋白质和碳水化合物的相对比例在红外光谱上差异性较显著,不同厂家相同类别的奶粉既有一定的一致性,在添加辅料的类型和用量上又有所不同。奶粉中脂肪含量高的谱图在1747cm^-1附近的C-O吸收峰和2926cm^-1附近的CH2吸收峰很强;蛋白质高的奶粉所对应的酰胺Ⅰ带的C=O吸收峰(1650cm^-1)和酰胺Ⅱ带的N—H及C-N吸收峰(1540cm^-1)强度较大;奶粉中碳水化合物所对应的C-O伸缩振动峰和环的振动峰在1150~900cm^-1范围内较显著。麦芽糊精、蔗糖和乳糖这三种常用辅料同样具有明显的指纹特征。该方法可简便、快速、直观地评价奶粉品质的优劣。  相似文献   

20.
由于红外吸收光谱法具有许多突出的优点,因此它在许多领域有广泛的应用。在薄膜、合成纤维、橡胶、塑料等高聚物的研究方面,用于单体、聚合物、添加剂的定性、定量和结构分析。一般高聚物的红外光谱中谱带的数目很多,而且不同种类的物质其光谱很不相同,特征性很强。此外红外光谱法的制样和实验技术相对比较简单,它适用于各种物理状态的样品。本实验研究以高聚物薄膜材料做样品,对样品高聚物进行红外光谱分析,分析表明,本实验所用样品高聚物成分为聚乙烯材料,这个实验结果也表明,用红外光谱法鉴定高聚物的组成非常有效。红外光谱法用于定量组分分析,与其它测量方法相比,具有制样简单方便、重复性好和测量精度高的特点。  相似文献   

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