نتایج جستجو برای: schiff bases

تعداد نتایج: 72031  

Journal: :Proceedings of the National Academy of Sciences 1979

2012
A. P. Mishra Neha Sharma Rajendra K. Jain

Schiff bases have been synthesized by condensing nicotinamide with methyl isobutyl ketone (MKN) and 2-hydroxy acetophenone (HAN). Metal complexes have been prepared by interacting these Schiff bases with metal ions viz. Ni(II), Cu(II) 1:2 (metal:ligand) ratio. These compounds have been synthesized by conventional as well as microwave methods and characterized by elemental analysis, FT-IR, UV-Vi...

2013
J. Panda

In this study, a series of isatin-based Mannich bases were prepared and their biological activity was evaluated. Schiff bases of isatin were synthesized by condensation of the keto group of isatin with different aromatic primary amines. The NMannich bases of the above Schiff bases were synthesized by reaction of the acidic imino group of isatin with formaldehyde and secondary amine. The chemica...

Journal: :iranian journal of science and technology (sciences) 2011
a. jarrahpour

pure azo schiff bases were readily and conveniently accessible in high yields by mixing of the reagents either as aqueous slurry, or by grinding at room temperature. this method, unlike a classical method, needs neither harsh conditions nor organic solvents. the satisfactory results were obtained with excellent yields, short reaction time, and operational simplicity in the experimental procedur...

Journal: :Molecules 2004
Zeliha Hayvali Mustafa Hayvali Hakan Dal

New crown ether Schiff base derivatives were prepared by the condensation of 4'-formylbenzo-15-crown-5 or 4'-formyl-5'-hydroxybenzo-15-crown-5 with 1,2-bis(2-aminophenoxy)ethane. The structures of these new compounds were confirmed on the basis of elemental analysis, IR, (1)H- and (13)C-NMR, UV-Vis and mass spectroscopic data.

2010
Abeer Mohamed Farag Siang Guan Teoh Hasnah Osman Suchada Chantrapromma Hoong-Kun Fun

The title Schiff base compound, C(17)H(13)N(3)O(3), crystallizes in a zwitterionic form and exists in a trans configuration about the C=N bond. The mol-ecule is slightly twisted, the dihedral angle between the benzene ring and naphthalene ring system being 10.80 (9)°. The nitro group is twisted relative to the plane of the benzene ring [dihedral angle = 8.88 (12)°]. Bifurcated intra-molecular N...

2008
Xue-Wen Zhu Xu-Zhao Yang

In the title centrosymmetric mononuclear nickel(II) complex, [Ni(C(13)H(20)N(2)O(2))(2)](ClO(4))(2), the Ni(II) atom is four-coordinated by the imine N and phenolate O atoms of the zwitterionic forms of two Schiff base ligands in a square-planar coordination geometry. In the crystal structure, mol-ecules are linked through inter-molecular N-H⋯O hydrogen bonds, forming chains running along the a...

2011
Nura Suleiman Gwaram Hamid Khaledi Hapipah Mohd Ali

In the title compound, [ZnI(2)(C(13)H(19)N(3)O)], the Zn(II) ion is five-coordinated in a distorted square-pyramidal geometry, in which the basal plane is defined by three N atoms from the Schiff base ligand and one iodide ion. A second iodide ligand, situated in the apical position, completes the coordination geometry. In the crystal structure, C-H⋯O hydrogen bonds link a pair of mol-ecules ar...

2011
Irvin Booysen Muhammed Ismail Thomas Gerber Eric Hosten Richard Betz

The title compound, C(12)H(14)N(5)O(2) (+)·Br(-), is the hydro-bromide salt of a Schiff base in which protonation has taken place at the pyridine N atom. This organic cation is essentially planar (r.m.s. of all fitted non-H atoms = 0.0448 Å). In the crystal, N-H⋯Br hydrogen bonds as well as C-H⋯O and C-H⋯Br inter-actions connect the mol-ecules, forming a three-dimensional network.

2010
Cong-Shan Zhou Tao Yang

The title Schiff base compound, C(14)H(9)Cl(3)N(2)O, exists in a trans configuration with respect to the C=N bond and the dihedral angle between the two benzene rings is 13.5 (2)°. In the crystal, inter-molecular N-H⋯O hydrogen bonds link adjacent mol-ecules into extended C(4) chains propagating along the c-axis direction.

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