Synthesis, X-ray crystal structure, DFT calculation and catalytic activity of two new oxido-vanadium(V) complexes containing ONO tridentate Schiff bases
摘要:
Two new oxido-vanadium(V) complexes, [VO(L-1)(EtO)] (1) and [VO(L-2)(2-BuO)] (2) [H2L1 = 2{(5-chloro-2-hydroxyphenyl)iminomethyl}phenol and H2L2 = 4-bromo-2-{(2-hydroxy-5-methylphenyl] iminomethyl}phenol], have been prepared by the reaction of VO(acac)(2) with the ONO tridentate salicylidene Schiff bases H2L1 and H2L2, and fully characterized by FT-IR, molar conductivity, elemental analyses, H-1 NMR and electronic spectra. The structures of the complexes have also been determined by X-ray diffraction. Computational studies were performed at the B3LYP/6-311G(d,p) level. Furthermore, the catalytic activity of these compounds was investigated for a multicomponent reaction of cyclic enaminoketones, malononitrile and aromatic aldehydes. (C) 2014 Elsevier Ltd. All rights reserved.
A series of functionalized 2,3-dihydro-1,4-benzoxazines were obtained in moderate to excellent yields via domino [5 + 1] annulations of 2-halo-1,3-dicarbonyl compounds 2 with imines 1 under mild conditions and the application of this method in the synthesis of bioactive analogues, such as functionalized tetracyclic-1,4-benzoxazines which contain two new heterocyclic rings and one quaternary carbon
The VO(IV) complexes of tridentate ONO Schiff ligands were synthesised and characterized by IR, UV–vis and elemental analysis. The electrochemical properties of the vanadylcomplexes were investigated by cyclic voltammetry. A good correlation was observed between the oxidation potentials and the electron withdrawing character of the substituents on the Schiffbase ligands, showing the following trend:
The synthesis of a series of 3,4-dihydroquinolines (3b–e, 3h and 3i) by Imino Diels–Alderreactions involving sulfolene and boronates 2a–j derived from Schiff bases is described. The reactions are regioselective leading to 4-substituted dihydroquinolines with a cis relative stereochemistry between the phenyl group on the boron atom and the vinyl substituent at position 4, as established by X-ray diffraction
the structures of the compounds was examined. Antimicrobialactivity of the compounds was evaluated against Staphylococcus aureus, Staphylococcus epidermidis, Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa, Proteus mirabilis. Antifungal activities were reported for Candida albicans. Schiffbases showed considerable antimicrobialactivity against S. aureus, S. epidermidis and C. albicans
使用适当的合成路线合成了一系列N-(5-氯-2-羟基苯基)-(3/4 / 5-取代)-水杨醛亚胺(I - XI)。通过FT-IR,UV-Visible,ESI-MS,1 H和13 C NMR光谱技术和分析方法对它们的结构进行了表征。N-(5-氯-2-羟基苯基)-5-溴水杨基醛亚胺(V)的晶体结构在室温下通过X射线衍射测定。研究了熔点与化合物结构之间的关系。评估了该化合物对金黄色葡萄球菌,表皮葡萄球菌,大肠杆菌,肺炎克雷伯菌,铜绿假单胞菌,奇异变形杆菌。据报道,白色念珠菌具有抗真菌活性。席夫碱表现出了相当的抗菌活性对金黄色葡萄球菌,表皮葡萄球菌和Ç。白色的。N-(5-氯-2-羟基苯基)-3-羟基水杨基亚胺(II)具有最广泛和最高的抗菌活性。
Syntheses, characterizations, crystal structures, and biological activities of two new mixed ligand Ni(II) and Cu(II) Schiff base complexes
作者:S. Yousef Ebrahimipour、Maryam Mohamadi、Jesús Castro、Nasrin Mollania、Hadi Amiri Rudbari、Alessandro Saccá
DOI:10.1080/00958972.2014.1000883
日期:2015.2.16
imidazole. Their structures were characterized by microanalysis, FT-IR, UV–vis, molar conductivity, and 1H NMR for [Ni(L)(2imi)]·MeOH. The structures were determined using single crystal X-ray diffraction. Each four-coordinate metal center, Cu(II) in 1 and Ni(II) in 2, is surrounded by donors of Schiff base (L2−) and N of 2-methyl imidazole in square planar geometries. α-Amylase activities of these compounds