排序方式: 共有37条查询结果,搜索用时 203 毫秒
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Electrochemistry: A Tool for Characterization of Hybrid Materials Obtained by Non-Hydrolytic Sol-Gel Route and Containing Ferrocene Derivatives 总被引:3,自引:0,他引:3
G. Calleja G. Cerveau P. Labbé L. Coche-Guérente 《Journal of Sol-Gel Science and Technology》2003,26(1-3):307-310
The 1,1-ferrocenediyldichlorosilane 1 was introduced into oxide matrices (SiO2, TiO2, Al2O3) by non-hydrolytic sol-gel route. In all cases some degradation of the ferrocenyl moiety occurred. The materials were immobilized onto an electrode surface as a composite film with PTFE and their cyclic voltammograms were studied. For each sample a reduction wave around –375 mV was evidenced which was attributed to the reduction of [FeIII Cl
x
]3 – x
species arising from the decomposition of ferrocenyl species during the condensation process. 相似文献
3.
维生素B12及其衍生物的电化学研究 总被引:2,自引:0,他引:2
评述了维生素B12及其衍生物的电化学研究,讨论了电化学在理解B12生理功能方面的重要性,阐述了有关B12电化学研究的最新进展,预测了研究的前景。 相似文献
4.
The complexes formed in the interaction between copper(II) anda-andβ-galacturonic acid, in the pH range 2.5–11.0, have been investigated by means of d.c. polarography and cyclic voltammetry.
Witha-galacturonic acid, no complex is formed with copper up to pH 6. Between pH 6 and about 9.5, a complex is formed in solution.
Above pH 9.5, the complex appears to break up releasing the ligand. In the case of β-galacturanic acid, no complex is formed
until pH 3.5, and persists in solution up to a pH of about 9.5. A second complex forms above pH 6.9 and co-exists with the
first complex up to pH 9.5. The complexes formed with both forms of galacturonic acid were studied and the stability constant
of the coppera-galacturonate determined. 相似文献
5.
Milan Maji Mossaraf Hossain Madhumita Chatterjee Shyamal Kumar Chattopadhyay Vedavati G. Puranik Pinak Chakrabarti Saktiprosad Ghosh 《Polyhedron》1999,18(27):1436-3739
Reaction of Ru(PPh3)2Br2 with the NNS chelating tridentate ligand 2-pyridyl-N-(2′-methylthiophenyl)methyleneimine (L) led to the isolation of the ruthenium(II) complex [Ru(L)(PPh3)Br2]. Reactivity of this complex with different bidentate chelating ligands revealed that the products are quite different from those obtained by reacting Ru(L)(PPh3)Cl2 (the corresponding cis dichloro complex) with the same ligands under comparable conditions. The mixed chelates were isolated and characterised by elemental analysis, magnetic moment measurement and by different spectroscopic methods along with their precursor. Electrochemistry of the complexes was examined by cyclic voltammetry using a platinum working electrode and a Ag/AgCl electrode as reference. The crystal structure of [Ru(L)(PPh3)Br2] disclosed that, unlike Ru(L)(PPh3)Cl2, the two bromo ligands are in trans position and this explained the difference in its reactivity pattern from the corresponding chloro complex. 相似文献
6.
Synthesis and characterization of some phenyl azo substituted tetraaza macrocyclic complexes of Ni(II) are reported. Electrochemical
behaviour of these macrocyclic complexes has been examined using polarographic, voltammetric and spectroscopic techniques.
These studies show that both the ligand and the metal are electrochemically active. The electrochemical behaviour of the azo
function has been shown to occur through a single four-electron process. When a nitro group is also present, the nitro function
of the azo moiety is reduced in a six-electron cathodic wave. 相似文献
7.
Juan M. Fernández-G. Ma.del Rocío Patiño-Maya Rubén A. Toscano Luis Velasco Martha Otero-López Martha Aguilar-Martínez 《Polyhedron》1997,16(24):4351-4378
The Schiff base ligands, 2-hydroxy-N-cyclohexyl-l-naphthaldimine (I), and 3-hydroxy-N-cyclohexyl-2-naphthaldimine (II), and their corresponding CuII complexes (1–2) respectively were synthesized and characterized. The crystal and molecular structures of bis-{(cyclohexyl)[(2-oxo-1H-naphth-1-ylidene)-methyl]aminato}copper(II) (1) and bis-{(cyclohexyl)[(3-oxo-2H-naphth-2-ylidene)-methyl]aminato} copper(II) (2), were determined. The X-ray diffraction study shows that the geometry around the metal atom for (1), is stepped square planar with a step of 1.063 Å while for (2), the geometry around the metal atom for square planar with an angle between the coordination planes O(1)---Cu---N(1) and O(1a)---Cu---N(1a) of 39.9°. Electrochemical studies show a dependence of the CuII/CuI potentials on the ligand structure. 相似文献
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HaoWANG QiuHongLI SuXiangWU FengHuaWEI 《中国化学快报》2004,15(4):486-488
Polyaniline(PANI)film was electrosynthesized on 304 stainless steel by cyclic voltammetry using aqueous oxalic acid as supporting electrolyte.The potential sweep rates were changed to achieve the PANI film with different thickness and structures.Protective properties of the PANI film for corrosion of stainless steel in 3% NaC1 aqueous solution were investigated by monitoring potentiodynamic polarization curves and electrochemical impedance spectroscopy(EIS).The results showed that the PANI film which was formed with lower sweep rate led to more positive shift of corrosion potential and greater charge transfer resistance,reflecting higher inhibition for corrosion of the stainless steel. 相似文献
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IntroductionTherareearthsandtheiralloysarewidelyusedasmagnetic,ophcal,nuclear,andsuperconductingmaterials.IfsuchametalthinfilInwaspreParedbyelectrodeposition,thefimctionefficiencywouldbegreatlyborovedandtheaPplicationfieldshouldex-pandextensively.However,theelectrodepositionofrareearthfromaqueoussoluhoniscomPlicatedbythefactthathydrogenisevolvedbeforerareearthisdeposited.Thus,aProhcnonaqueoussolventssuchasddriethylformandde(DMF),dAnethylsulfoxide(DMSo),propylenecarbonate(PC),andformandde… 相似文献
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E. Yu. Khmel'nitskaya N. B. Grigor'ev S. Yu. Ryabova Yu. I. Trofimkin V. A. Azimov V. G. Granik 《Chemistry of Heterocyclic Compounds》2002,38(11):1357-1362
We have conducted an electrochemical study of the oxidation-reduction properties of synthesized dienediamines: derivatives of indole, pyrrole, and thiophene. We have established that reduction of the indicated compounds occurs with successive transfer of two electrons, the first transfer being reversible. We consider the effect of structural factors and the nature of the heterocycle on the ease of reduction of the given compounds. We present the results of an initial study of the NO-donor ability of the compounds upon oxidation. 相似文献