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1.
四-(对-十二酰氧基)苯基卟啉过渡金属配合物的合成及其液晶行为研究 总被引:6,自引:0,他引:6
合成了5,10,15,20-四-(对-十二酰氧基)苯基卟啉(简称TLPPH2)及其Mn(Ⅲ),Fe(Ⅲ),Co(Ⅱ),Ni(Ⅱ),Cu(Ⅱ)和Zn(Ⅱ)配合物,通过元素分析、紫外可见光谱、红外光声光谱、核磁共振氢谱和摩尔电导等分析方法表征了它们的组成和结构.用DSC和偏光显微镜研究了配体及其锌配合物的液晶行为.结果表明,锌配合物的液晶相变温度始于-50.67℃,相区宽度达143℃. 相似文献
2.
四(对-癸酰氧基)苯基卟啉过渡金属配合物的合成及红外光声光谱解析 总被引:7,自引:0,他引:7
合成出相变温度较低、相区宽的卟啉液晶5,10,15,20-四(对-癸酰氧基)苯基卟啉[简称TDPPH2]及其Mn(Ⅲ),Fe(Ⅲ),Co(Ⅱ),Ni(Ⅱ),Cu(Ⅱ),Zn(Ⅱ)配合物.通过元素分析、紫外可见光谱、红外光声光谱、核磁共振氢谱和摩尔电导等分析方法表征了它们的组成和结构,并用DSC和偏光显微镜研究了配体及其锌配合物的液晶行为.测试并研究了配体及其配合物在3600~190cm-1范围内的傅里叶变换红外光声光谱,对其主要谱带进行了经验归属. 相似文献
3.
合成了5,10,15,20-四(对-十八酰氧基)苯基卟啉及其Mn(Ⅲ),Fe(Ⅲ),Co(Ⅱ),Ni(Ⅱ),Cu(Ⅱ)和Zn(Ⅱ)配合物,用元素分析和紫外-可见光谱等方法进行了表征.研究了这7种卟啉化合物在3600~190cm-1范围内的傅里叶变换红外光声光谱,对主要谱带进行了经验归属.结果表明,3318.0及968.4cm-1处的吸收谱带分别是四(对-十八酰氧基)苯基卟啉N-H键的伸缩振动和面内弯曲振动,生成配合物后这些谱带消失.243cm-1附近的吸收谱带是M-N键伸缩振动和卟啉环变形振动的复合振动,321cm-1附近的吸收谱带是M-Cl键的伸缩振动,金属敏感带出现在1350,1018,995,802,740,632和232cm-1附近. 相似文献
4.
将丙烯酰氯和5-邻氨基苯基-10,15,20-三苯基卟啉(Ⅰ)相连合成了5-邻丙烯酰胺苯基-10,15,20-三苯基卟啉(Ⅱ)。在引发剂作用下,Ⅱ进一步聚合,生成聚5-邻丙烯酰胺苯基-10,15,20-三苯基卟啉(Ⅲ),同时还合成了单体和聚合物的钴配合物。通过元素分析、核磁共振谱、红外光谱和可见吸收光谱对单体和聚合物的结构进行了鉴定。 相似文献
5.
四(对-辛酰氧基)苯基卟啉配合物的红外光声光谱 总被引:6,自引:0,他引:6
测试并研究了四(对-辛酰氧基)苯基卟啉及其Mn(Ⅲ)、Fe(Ⅲ)、co(Ⅱ)、Ni(Ⅱ)、Cu(Ⅱ)、Zn(Ⅱ)配合物在3600~190cm-1范围内的傅立叶变换红外光声光谱,对主要谱带进行了经验归属.结果表明:3318.0和968.0cm-1处的吸收谱带分别是四(对-辛酰氧基)苯基卟啉N-H键的伸缩振动和面内弯曲振动,生成配合物后这些谱带消失.~243cm-1处的吸收谱带是M-N键伸缩振动和卟啉环变形振动的复合振动,~320cm-1处的吸收谱带是M-Cl键的伸缩振动,金属敏感带出现在1504,1350,1022,995,796和235cm-1处. 相似文献
6.
四(对-硝基苯基)卟啉配合物的红外和拉曼光谱 总被引:3,自引:0,他引:3
本文研究了四(对-硝基苯基)卟啉及其Cr(Ⅲ)、Mn(Ⅲ)、Fe(Ⅲ)、Co(Ⅱ)、Ni(Ⅱ)、Cu(Ⅱ)、Zn(Ⅱ)配合物的3500~220cm~(-1)的红外光谱和1700~100cm~(-1)的拉曼光谱.谱带归属表明,~250cm~(-1)谱带是M—N伸缩振动和卟啉环变形振动的复合振动.金属敏感带出现在~1600、~1582、~1547、~1284、~1190、~355和~245cm~(-1)处,其中二价金属配合物金属敏感带频率按Ni>Co>Cu>Zn顺序递减.用金属半径和d_x~2 y~2电子排斥作用解释了金属敏感带变化规律. 相似文献
7.
研究了四(对-硝基)苯基卟啉及其Cr(Ⅲ)、Mn(Ⅲ)、Fe(Ⅲ)、Co(Ⅱ)、Ni(I)、Cu(Ⅱ)、Zn(Ⅱ)配合物的3500-225 cm-1范围的傅立叶变换红外光声光谱.对主要谱带进行经验归属.金属敏感谱带出现在-1489、-1076、-737和-250 cm-1等附近.-250 cm-1谱带是M—N伸缩振动和卟啉环变形的复合振动. 相似文献
8.
9.
5,10,15,20-四(对氯苯基)卟啉羟基稀土配合物的光谱研究 总被引:8,自引:0,他引:8
研究了四(对氯苯基)卟啉及其羟基稀土配合物的紫外-可见光谱、红外光谱和拉曼光谱,对主要谱带进行了经验归属,讨论了中心离子对紫外光谱和共振拉曼光谱结构敏感带频率的影响. 相似文献
10.
11.
Physico-chemical properties of Chitosan films 总被引:1,自引:0,他引:1
Luminita Balau Gabriela Lisa M. I. Popa V. Tura V. Melnig 《Central European Journal of Chemistry》2004,2(4):638-647
Chitosan films obtained by dry phase inversion were prepared from an aqueous solution of chitosan in acetic acid. The films,
of thickness less than 20 μm, were transparent, very flexible and had smooth surfaces. Increasing the film thickness induced
an increase of the internal tensions and the consequent formation of a rough surface. Structural investigations by X-ray diffraction
and Fourier transform IR analysis, showed that the chitosan films, as prepared, are amorphous. Further annealing to evaporate
acetic acid and water traces, changed the amorphous phase into a more ordered phase, characterized by diffraction peaks at
2θ values of 9, 17, 20 and 23 degrees. Thermal investigations by TG, DTG, and DTA revealed that the decomposition of the chitosan
films as prepared proceeds in two stages, starting from 180°C and 540°C. 相似文献
12.
Pyrazoles as molecular probes to study the properties of co-crystals by solid state NMR spectroscopy
Concepción López Rosa M. Claramunt M. Ángeles García José Elguero 《Central European Journal of Chemistry》2004,2(4):660-671
Equimolar mixtures of 3,5-dimethylpyrazole (1) with four NH-imidazoles (2–5) have been studied by13C and 15N CPMAS NMR and by DSC. In three cases, the solid mixture behaves as the sum of the individual components [imidazole (2), 2-methylimidazole (3) and 2,4(5)-dimethylimidazole (5)]. In one case [4,5-dimethylimidazole (4)], the mixture corresponds to a new species in which the dynamic behavior of1 no longer exists. 相似文献
13.
Jinzhang Gao Yongjun Liu Wu Yang Lumei Pu Jie Yu Quanfang Lu 《Central European Journal of Chemistry》2005,3(3):377-386
A plasma induced degradation process has been studied to treat 4-nitrotoluene (4-NT) present as an aqueous pollutant. The
plasma was locally generated from a glow discharge around a tip of a platinum anode in an electrolytic solution. The influence
of initial pH and Fe2+ on the degradation was examined. Major intermediates resulting from the degradation process were identified. Amongst the
aromatic intermediates, p-hydroxybenzoic acid was the predominant degradation product. The formation of oxalic acid, malic
acid was also observed. The final products of degradation were NH
4
+
, NO
3
−
and CO2. Based on the analysis of intermediates and the kinetic considerations, the degradation was shown to follow a pseudo-first
order reaction hence, a possible reaction pathway was proposed. 相似文献
14.
An attempt was made to study the oxidation of manganese by air in synthetic waters. A series of batch experments were performed
at differnet values of concentration, temperature and pH. Unoxidized manganese in the solution was determined by formaldoxime
spectrometric method. Results of these studies indicated that the air oxidation of manganese soluble in water can be effectively
performed in basic media and that oxidation yield increasedwith an increase in pH and concentration. The yield was very high
in the presence of manganese dioxide, sepiolite or clinoptilolite in solution and, the oxidation was almost completed especially
at high values of pH and concentration. The reaction was found to be first order with respect to Mn2+ with a very low activation energy. A yield of 62% was obtained for the air oxidation of wastewater taken from the treatment
plant of Corum Municipality. 相似文献
15.
Friedrich Asinger Alfons Saus Magdalena von Wachtendonk 《Monatshefte für Chemie / Chemical Monthly》1980,111(2):385-398
Thiomorpholine as well as alkyl substituted thiomorpholines and their Sdioxides, respectively, are transformed into the corresponding N-Aminothiomorpholines by nitrosation (1–5) followed by the reduction with zinc in acetic acid/acetic acid anhydride under simultaneous formation of the corresponding N-acetyl derivates, and hydrolysis by hydrochloric acid (6–9). Examples of this method are described. 4-Aminothiomorpholines and their Sdioxides react with aldehydes or ketones to give azomethines (10–31). Acylation with mono-and dicarbonic acid chlorides leads to the N-acyl derivatives32–44.Mannich condensation is also possible. By oxidation with yellow mercury oxide tetracenes are formed (46–47).
Teil der DissertationM. Schmitz, Techn. Hochschule Aachen, 1975. 相似文献
16.
Hansjörg Meyer Hanskarl Müller-Buschbaum 《Monatshefte für Chemie / Chemical Monthly》1981,112(1):51-57
Solid state reaction of CuO and Al2O3 with a flux of PbO about 930°C and reaction time of 8d gives the new compound Cu2Al4O7. The red single crystals were examined by energydispersive microanalysis and X-ray diffraction methods. Cu2Al4O7 has cubic symmetry, space group
,a=908.0 pm. The typical coordination of Cu+ (CN=6 and CN=12) and the interstitial arrangement of the AlO4-tetrahedra are discussed with respect to related compounds. 相似文献
17.
H. S. Singh V. P. Singh B. S. Arya G. R. Varma 《Monatshefte für Chemie / Chemical Monthly》1981,112(11):1253-1260
Kinetics of oxidation of xylitol and galactitol by hexacyanoferrate(III) ion in aqueous alkaline medium is reported. The reaction rate is of first order with respect to hexacyanoferrate(III) in each substrate. The reaction is first order at lower concentrations of xylitol and galactitol and tends towards zero order as the concentration increases. Similarly first order kinetics was obtained with respect to hydroxide ion at lower concentrations and tends to lower order at higher concentration in the oxidation of xylitol; in the oxidation of galactitol the reaction is first order with respect to hydroxide ion even up to manyfold variation. The course of reaction has been considered to proceed through the formation of an activated complex between [K Fe(CN)6]2– and substrate anion which decomposes slowly into radical and [K Fe(CN)6]3–. A probable reaction mechanism is proposed.
Kinetik und Mechanismus der Oxidation von Xylit und Galaktit mit Hexacyanoferrat(III) in wäßriger, alkalischer Lösung
Zusammenfassung Das Geschwindigkeitsgesetz der Titelreaktion ist in beiden Fällen erster Ordnung bezüglich Hexacyanoferrat(III). Die Oxidation ist erster Ordnung bei niedrigen Konzentrationen von Xylit und Galaktit und geht bei Erhöhung der Konzentration gegen null. In gleicher Weise wurde eine Kinetik erster Ordnung bezüglich Hydroxyl bei niedrigen Konzentrationen und eine erniedrigte Ordnung bei höheren Konzentrationen für die Oxidation von Xylit beobachtet; bei Galaktit bleibt die Oxidation auch bei höheren Hydroxyl-Konzentrationen erster Ordnung. Es wird angenommen, daß die Reaktion über einen aktivierten Komplex zwischen [KFe(CN)6]2– und dem Substrat-Anion verläuft; dieser Komplex zerfällt in [KFe(CN)6]3– und ein Substrat-Radikal. Ein möglicher Reaktionsmechanismus wird vorgeschlagen.相似文献
18.
Heinz Falk Günther Höllbacher Otmar Hofer Norbert Müller 《Monatshefte für Chemie / Chemical Monthly》1981,112(3):391-403
A force field model was designed with respect to the special needs of bile pigments. It is parametrized and tested using partial structures of bile pigments as well as an integral pigment; the solution structures of the molecules were previously deduced using independent experimental methods.
38. Mitt::Falk, H., Schlederer, T., Wolshann, P., Mh. Chem.112, 199 (1981). 相似文献
19.
Titus Constantinescu Petre Ionita Ion Chiorescu Gabriela Ionita 《Central European Journal of Chemistry》2003,1(4):465-476
Ten novel and stable free radicals of nitronyl-, imino-nitroxide and hydrazyl type compounds were synthesized and their physico-chemical
properties investigated. UV-Vis and ESR spectroscopic data, as well as the lipophilicities and specific hydrophobic areas
of the compounds are compiled. The reaction of these radical compounds with nitric oxide and nitrogen dioxide was also investigated.
The radicals synthesized, show selectivity in their reaction with these nitric oxides, depending on their structure (nitronyl-nitroxide
radicals react with NO, while hydrazyl radicals react with NO2). The processes are easily monitored by UV-Vis or ESR spectroscopy. 相似文献
20.
Richard Vytlacil 《Monatshefte für Chemie / Chemical Monthly》1980,111(5):1075-1086
In the ternary system silver chloride-lithium chloride-sodium chloride the kinetics of the galvanic deposition of silver on graphite electrodes was investigated as well as its dissolution without current in the molten salt saturated with chlorine gas.In addition the emf-values were measured in the temperature range between 923 K and 1,173 K by means of, the formation cell graphite/Ag(s)/AgCl(l)–LiCl(l)–NaCl(l)/Cl2 graphite From these data the partial molar free excessGibbs energies were calculated. Using the equation for a multicomponent system as suggested byRedlich-Kister
1
G
AgCl
E
values were obtained by a non-linear fitting process, where the fit was performed for all investigated temperatures and over the entire concentration range in the ternary system. With the parameters obtained the partial and integral excess valuesG
i
E
,G
E
,H
i
E
,H
E
,S
i
E
andS
E
were calculated. 相似文献