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1.
Eshtiagh-Hosseini H Housaindokht MR Beyramabadi SA Tabatabaei SH Esmaeili AA Khoshkholgh MJ 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2011,78(3):1046-1050
A new N,N'-dipyridoxyl(1,4-butanediamine) [=H(2)BS] Schiff-base ligand and its Cu(II) salen complex, [Cu(BS)(H(2)O)(CH(3)OH)], were synthesized and characterized by IR, UV-vis, (1)H NMR, mass spectrometry and elemental analysis. Also, full optimization of the geometries, (1)H NMR chemical shifts (for the H(2)BS) and vibrational frequencies were calculated by using density functional theory (DFT) method. Structure of the H(2)BS ligand is not planar, i.e. two pyridine rings are not in the same plane. In the structure of the Cu complex, the Schiff-base ligand acts as a dianionic tetradentate ligand in N, N, O(-), O(-) manner. The coordinating atoms of BS(2-) occupy equatorial positions of the octahedral complex, where the H(2)O and CH(3)OH ligands locate at axial positions. The calculated results are in good agreement with the experimental data, confirming the suitability of the proposed and optimized structures for the H(2)BS ligand and its Cu complex. 相似文献
2.
Ali Sarafraz-Yazdi Amirhassan AmiriGholamhossein Rounaghi Hossein Eshtiagh-Hosseini 《Analytica chimica acta》2012
In this study, poly(ethylene glycol) (PEG) grafted multi-walled carbon nanotubes (PEG-g-MWCNTs) were synthesized by the covalent functionalization of MWCNTs with hydroxyl-terminated PEG chains. PEG-g-MWCNTs was used as a novel stationary phase to prepare the sol–gel solid-phase microextraction (SPME) fiber in combination with gas chromatography–flame ionization detector (GC–FID) for the determination of ibuprofen, naproxen and diclofenac in real water samples. 相似文献
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Mohsen Nikpour Hossein Eshtiagh-Hosseini Masoud Mirzaei Amir Aghaei Kaju Soroush Zarinabadi 《中国化学快报》2010,21(4):501-505
<正>A unique ionic hybrid material[C_6H_(12)N_5O]_3[(PO_4)W__(12)O_(36)]·5H_2O has been synthesized from the reaction of((1H-tetrazole-5- yl)methyl)morpholine andα-H_3[(PO_4)W_(12)O_(36)]·21H_2O.It has successfully been characterized by elemental analysis,IR and ~1H NMR spectroscopies,TGA and single-crystal X-ray diffraction method.The title compound is constructed from the three [C_6H_(12)N_5O]~+ cations andα-Keggin[(PO_4)W_(12)O_(36)]~(3-) polyoxoanion.The most remarkable structural feature of this hybrid can be described as two-dimensional inorganic infinite plane-like(2D/∞)[(PO_4)W_(12)O_(36)]~(3-)) which forming via van der Waals interactions along the x axis. 相似文献
5.
Hossein Eshtiagh-Hosseini Mohammad Reza Housaindokht Mohammad Chahkandi Ali Morsali 《Transition Metal Chemistry》2010,35(8):939-947
Abstract
Density functional theory has been used to study the mechanism of bromide oxidation by the oxo-peroxo complex K[VO(O2)Hheida] (heida = N-(2-hydroxyethyl)iminodiacetic acid), which has the highest reported rate constant for bromide oxidation of any vanadium complex. Two possible mechanisms were explored, involving bromide attack on a protonated or unprotonated peroxo atom. The direct nucleophilic attack of bromide on a protonated peroxo begins the reaction, i.e. the protonated peroxo ligand is the active site of reaction. We examined five different transition states in the mechanism. Two transition states were found to have lower activation barriers. A reduction in the potential energy barriers, when calculated using the polarisable continuum model, indicates that with the involvement of acetonitrile as a solvent the transition states become more stable. 相似文献6.
M. Sohani M. R. Housaindokht R. Jalal H. Eshtiagh-Hosseini A. Hassanpoor Z. Rouhbakhsh Zaeri 《Journal of the Iranian Chemical Society》2017,14(6):1309-1316
A new cobalt (II) coordination compound was synthesized using proton transfer mechanism. The reaction between CoCl2·2H2O, Salicylic acid (H2Sal) and acridine (Acr) gave a new coordination compound formulated as (HAcr)4[Co(Sal)3], which was characterized by elemental analysis, NMR, IR and UV/Vis spectroscopies. The interaction of this complex with DNA has been investigated in vitro using UV absorption, fluorescence spectroscopy, viscosity measurements and gel electrophoresis methods. The intrinsic binding constant has been estimated to be 5.8 × 105 M?1 using UV absorption. The interaction of DNA–Co (II) complex caused quenching in fluorescence. The binding constant, the number of binding site and Stern–Volmer quenching constant have been calculated to be 7.7 × 104 M?1, 1.143 and 1.5 × 104 Lmol?1, respectively. The increase in the viscosity of DNA with increasing the concentration of the Co (II) complex and the observations of other experiments suggest that the cobalt (II) complex binds to DNA by partial intercalation binding mode. Furthermore, the interaction of DNA–Co (II) complex was confirmed using gel electrophoresis studies. Moreover, molecular docking technique predicted partial intercalation binding mode for the complex. 相似文献
7.
Mirzaei M. Eshtiagh-Hosseini H. Alfi N. Aghabozorg H. Gharamaleki J. Attar Beyramabadi S. A. Khavasi H. R. Salimi A. R. Shokrollahi A. Aghaei R. Karami E. 《Structural chemistry》2011,22(6):1365-1377
Structural Chemistry - Three new coordination compounds of Cu(II), Co(II), and Zn(II) based on different dicarboxylic acids formulated as (AcrH)[Cu(pydc)(pydcH)]·5H2O (1)... 相似文献
8.
Sara Hosseinzadeh-Baghan Masoud Mirzaei Hossein Eshtiagh-Hosseini Vahideh Zadsirjan Majid M. Heravi Joel T. Mague 《应用有机金属化学》2020,34(9):e5793
A novel inorganic–organic hybrid, [Dy4(PDA)4(H2O)11(SiMo12O40)]·7H2O denoted as (POM@Dy-PDA), based on a lanthanide cluster, a Keggin-type polyoxomolybdate, and PDA (1,10-phenanthroline-2,9-dicarboxylic acid) was prepared and fully characterized by elemental analysis, Fourier-transform infrared and UV–Vis spectroscopies, thermogravimetric analysis, powder X-ray diffraction (PXRD), and single-crystal X-ray diffraction. The structural analysis study showed that the [SiMo12O40]4− ions reside in the interspace between two cationic layers as discrete counterions and are not coordinated to the rare-earth ions. Significantly, this hybrid catalyst is a rare case of an inorganic–organic hybrid polyoxometalate (POM) with a PDA ligand based on CSD search (CSD version 5.40/November2018). The hybrid catalyst was further characterized via powder X-ray diffraction (PXRD) pattern at room temperature which indicated the good phase purity of the catalyst. BET and Langmuir surface area analysis indicate surface area of POM@Dy-PDA 6.6 and 51.3 m2g-1, respectively. The catalytic activity of the hybrid catalyst was successfully examined in the synthesis of 2-amino-4H-chromene derivatives through a multicomponent reaction. A three-component, one-pot reaction involving differently substituted benzaldehydes, resorcinol/α-naphthol/β-naphthol/4-hydroxycoumarin/3-methyl-4H-pyrazole-5(4H)-one, and malononitrile or ethyl cyanoacetate in the presence of a catalytic quantity of the aforementioned hybrid catalyst in EtOH/H2O under reflux condition gave the corresponding highly functionalized 2-amino-4H-chromenes in satisfactory yields. The catalyst can be reused several times without appreciable loss in its catalytic activity. 相似文献
9.
Hossein Eshtiagh-Hosseini Harold W. Kroto John F. Nixon Osamu Ohashi 《Journal of organometallic chemistry》1979,181(2):C1-C3
The previously postulated phosphaalkene intermediate CF3 P=CF2 in the alkaline hydrolyses of (CF3)2 PH has been trapped and characterised by its 19F and 31P NMR spectra. 相似文献
10.
Syntheses of Co2Rh2(CO)8(PF3)4 and Co2Rh2(CO)10(PF3)2 are described and their structures are discussed. Evidence is presented for an intermolecular ligand exchange between several tetranuclear cluster complexes. 19F and 31P NMR and mass spectroscopic data are presented and discussed. The complexes Rh4(CO)4(PF3)8 and Co2Ir2(CO)8(PF3)4 have been identified by their mass spectra. 相似文献