New Unsymmetrical Oxovanadium(IV) Complexes of Mixed‐Donor Amido and Oxo Ligands
摘要:
The novel, unsymmetrical, mixed-donor, tetradentate amido, and oxo complexes of V(IV) of the general formula VOLx were synthesized by a nontemplate method and characterized by physico-chemical methods. The ligands were prepared by a two-stage aldol condensation reaction in the molar ratio I : I of 2-hydroxybenzaldehyde, 2'-hydroxyacetophenone, or 2',4'-dihydroxyacetophenone and 1,2-diaminopropane of the general formula HA(x) (x = 1-3) as precursors. The tetradentate mixed donor ligands of the general formula H2Lx (x = 1-6) were obtained by condensation reaction of precursors with appropriate ketone or aldehyde. The synthesis of the ligand system, described here, is an efficient and easy method with the advantages of high yield, selectivity, and short reaction times. Only a brown polymeric form was obtained for VOL2 and green monomeric forms were obtained for VOLx, x = 1, 3-5, while in the presence of strong field ligands only monomeric forms were obtained. These observations suggest that monomeric forms of oxovanadium(IV) complexes exhibit a coordination number of five with N2O3 donor sets and the polymeric form exhibits a coordination number of six with N2O4 donor sets. Analytical data, H-1 NMR, IR, UV-VIS spectra, and elemental analyses confirm the nature of the products.
Synthesis, Characterisation and Antiamoebic Studies of Dioxovanadium(
<scp>V</scp>
) Complexes Containing ONS Donor Ligands Derived from
<i>S</i>
‐Benzyldithiocarbazate
作者:Mannar R. Maurya、Shilpa Khurana、Shailendra、Amir Azam、Wenjian Zhang、Dieter Rehder
DOI:10.1002/ejic.200200642
日期:2003.5
The potassium counterions, coordinated to water molecules, the phenolate-O, the oxo groups on vanadium and, in the case of 1, to the thiolate, provide interlinkages between the anions and thus a complex supramolecular network, further reinforced by intermolecular hydrogen bonds between oxo groups and water molecules. In vitro tests of the antiamoebic activity against the protozoan parasite Entamoeba
Oxidovanadium (V and IV) complexes incorporating coumarin based O^N^O ligand: Synthesis, structure and catalytic activities
作者:Mitali Majumder、Kajal Krishna Rajak
DOI:10.1016/j.poly.2019.114241
日期:2020.1
Abstract The tridentate ligand H2L1, [(E)-7-Hydroxy-8-[(2-hydroxy-phenylimino)-methyl]-4-methyl-chromen-2-one] has been used in the present work towards the synthesis of mononuclear oxidovanadium complexes. Three mononuclear complexes [VOL1(OMe)(MeOH)], 1; [VO(L1)(8-Hq)], 2 and [VO(L1)(1,10-phen)], 3 have been successfully synthesized with high yields by reacting [VO(acac)2] with H2L1 in 1:1 ratio
摘要三齿配体H2L1 [[(E)-7-Hydroxy-8-[(2-hydroxy-phenylimino)-methyl] -4-methyl-chromen-2-one]已用于本研究的合成单核氧钒络合物。三种单核配合物[VOL1(OMe)(MeOH)],1; [VO(L1)(8-Hq)],2和[VO(L1)(1,10-phen)],3通过[VO(acac)2]与H2L1的1:反应成功地成功合成了3在回流条件下甲醇中的比率为1,其中在配合物2和3的合成中使用8-羟基喹啉和1,10-菲咯啉作为共配体。X射线晶体学研究表明,在本研究中合成的所有配合物中,配体H2L1作为O ^ N ^ O配体结合。通过使用UV-Vis,IR,NMR和质谱技术可以很好地表征合成的复合物。密度泛函理论(DFT)和时间依赖的密度泛函理论(TDDFT)计算已很好地解释了其理化性质。建立合成的配合物以显示一些独特的特性,
Designing high energy density flow batteries by tuning active-material thermodynamics
作者:Shyam K. Pahari、Tugba Ceren Gokoglan、Benjoe Rey B. Visayas、Jennifer Woehl、James A. Golen、Rachael Howland、Maricris L. Mayes、Ertan Agar、Patrick J. Cappillino
DOI:10.1039/d0ra10913d
日期:——
With the cost of renewable energy near parity with fossil fuels, energy storage is paramount. We report a breakthrough on a bioinspired NRFB active-material, with greatly improved solubility, and place it in a predictive theoretical framework.
ligand and the complex were performed. The proposed structures for the free ligand and the corresponding vanadium complex were corroborated by the use of geometry optimization and conformational analysis. The solid state structure of complex VOL was fully determined by single crystal X-ray diffraction analysis. Similar electrochemical behavior for both the ligand and the corresponding complex have been
由席夫碱配体通过邻苯二胺和5-溴水杨醛缩合反应合成了一种新的氧钒钒络合物。所有新化合物均通过1 H NMR,IR光谱,UV-Vis光谱,元素分析和质谱进行了表征。摩尔电导数据表明金属络合物是非电解质。进行了配体和配合物的热分析技术(TGA / DTA)。通过使用几何优化和构象分析,证实了所提出的游离配体和相应的钒配合物的结构。通过单晶X射线衍射分析完全确定了复合物VOL的固态结构。 通过循环伏安法(CV)已观察到配体和相应配合物的相似电化学行为。该络合物在606 mV / SCE下给出了基于金属的单电子准可逆氧化还原对,对应于VO IV / VO V氧化还原过程,这与流体动力学伏安图一致。随着扫描速率增长的CV中的其他峰已归因于配体的连续单电子还原。在环己烯的氧化反应中测试了氧钒席夫碱配合物VOL的催化活性。催化剂的效率受氧化剂的性质影响。结果表明,该配合物在最佳条件下对环己烯酮具有高活性和选择性。
Observations on the Mechanochemical Insertion of Zinc(II), Copper(II), Magnesium(II), and Select Other Metal(II) Ions into Porphyrins
作者:Adewole O. Atoyebi、Christian Brückner
DOI:10.1021/acs.inorgchem.9b00052
日期:2019.8.5
such as ball mill speed and reaction time, and investigated the often surprising roles of a variety of grinding agents. Also, the mechanochemical reaction conditions that remove zinc from a zinc porphyrin complex or exchange it for copper were studied. Using some standardized conditions, we also screened the feasibility of a number of other metal(II) insertion reactions (VO, Ni, Fe, Co, Ag, Cd, Pd