scholarly journals Simple generation of neutral bimetallic aluminium and zinc alkyls Schiff bases bridged by a central resorcinol moiety

2010 ◽  
Vol 8 (6) ◽  
pp. 1305-1310 ◽  
Author(s):  
Elham Aazam ◽  
Martyn Coles
Keyword(s):  
Schiff Base ◽  
Schiff Bases ◽  
Schiff Base Ligand ◽  
Ring Opening ◽  
Rotation Axis ◽  
Zinc Complexes ◽  
Ethyl Benzene ◽  
Alkyl Complexes ◽  
Neutral Ligands ◽  
Coordinate Geometry

AbstractAluminium and zinc complexes bearing the N,O-chelating Schiff base ligand 4,6-bis-1-(2-(dimethylamino)ethylimino)ethyl)benzene-1,3-diol, (C6H2(OH)2(NCH2CH2NMe2)2) (1a), have been synthesized. Bimetallic aluminium and zinc alkyl complexes (2a–4a) were prepared by treatment of the hexadentate 1a with the appropriate amount of AlMe3, ZnMe2 and ZnEt2, respectively. 2a has been characterized crystallographically, it lies on a crystallographic two-fold rotation axis and each aluminium centre adopts a five coordinate geometry. Complex 2a was tested as a catalyst in the ring-opening polymerisation of ɛ-caprolactone. We describe here the synthesis of two neutral ligands (1a and (C6H2(OH)2(C6H5NH2) (C=O(CH3)) (1b)) and demonstrate their application in the synthesis of molecular aluminium and zinc derivatives.

Manganese and zinc complexes incorporating an unsaturated cyclic Schiff base ligand

1976 ◽  
Vol 15 (1) ◽  
pp. 129-134 ◽  
Author(s):  
David R. Neves ◽  
James C. Dabrowiak
Keyword(s):  
Schiff Base ◽  
Schiff Base Ligand ◽  
Zinc Complexes

Improvement in zinc complexes bearing Schiff base in ring-opening polymerization of ε-caprolactone: A five-membered ring system

Polymer ◽  
2019 ◽  
Vol 182 ◽  
pp. 121812 ◽  
Author(s):  
Feng-Jie Lai ◽  
Li-Ling Chiu ◽  
Chieh-Ling Lee ◽  
Wei-Yi Lu ◽  
Yi-Chun Lai ◽  
...  
Keyword(s):  
Schiff Base ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Ring System ◽  
Membered Ring ◽  
Zinc Complexes

Copper(II) complexes of the bidentate Schiff-base ligand 2-(Phenyliminomethyl)pyridine and some related ligands

1975 ◽  
Vol 28 (2) ◽  
pp. 313 ◽  
Author(s):  
EJ Halbert
Keyword(s):  
Schiff Base ◽  
Schiff Bases ◽  
Schiff Base Ligand ◽  
Bidentate Schiff Base Ligand ◽  
Aliphatic Diamines ◽  
Solid Compounds

A number of copper(II) complexes of anils of pyridine-2-carbaldehyde with chloride, bromide, nitrate and perchlorate as anions have been prepared. Spectral and conductivity studies suggest that the compounds may be compared with the complexes of ligands such as bipyridyl and Schiff bases derived from pyridine-2-carbaldehyde and aliphatic diamines. Physicochemical evidence is given for the stereochemistry of the compounds. Mono-, bis- and tris-chelated compounds have been obtained. Complexes of the type CuLX2 (where X = Cl and Br) appear to be polymers with a five- or six-coordinate copper(II) stereochemistry. Evidence is presented for the existence of the five-coordinate cation [CuL2X]+ (where X = Br and NO3) in the solid compounds of type CuL2X2. In solution in nitromethane and methanol interaction occurs with the solvent. The bis- and tris- perchlorato compounds CuL2(ClO4)2 and CuL3(ClO4)2,2H2O are described and possible structures suggested by comparison with analogous compounds.

Bulk solvent-free melt ring-opening polymerization of L-lactide catalyzed by Cu(II) and Cu(II)-Nd(III) complexes of the Salen-type Schiff-base ligand

2011 ◽  
Vol 25 (4) ◽  
pp. 310-316 ◽  
Author(s):  
Lei-Lei Chen ◽  
Li-Qin Ding ◽  
Chu Zeng ◽  
Yong Long ◽  
Xing-Qiang Lü ◽  
...  
Keyword(s):  
Schiff Base ◽  
Schiff Base Ligand ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Solvent Free

scholarly journals Synthesis and antibacterial activity of some Schiff base complexes

2006 ◽  
Vol 71 (7) ◽  
pp. 733-744 ◽  
Author(s):  
R. Nair ◽  
A. Shah ◽  
S. Baluja ◽  
S. Chanda
Keyword(s):  
Antibacterial Activity ◽  
Schiff Base ◽  
Metal Complexes ◽  
Schiff Bases ◽  
Schiff Base Complexes ◽  
Ethyl Benzene ◽  
Resistant Bacteria ◽  
Bacterial Strains ◽  
Iron And Zinc

Two Schiff bases were synthesized from raceacetophenone: 1) ADS1 4-ethyl-6-{(E)-1-[(3-nitrophenyl)imino]ethyl}benzene-1,3-diol and 2) ADS3 4-ethyl-6-[(E)-1-{(2-nitrophenyl)imino]ethyl}benzene-1,3-diol. Then their metal complexes were formed. The metals selected for the preparation of complexes were copper, nickel, iron and zinc. Hence, in total 8 metal complexes were synthesized and screened for antibacterial activity against some clinically important bacteria, such as Pseudomonas aeruginosa, Proteus vulgaris, Proteus mirabilis, Klebsiella pneumoniae and Staphylococcus aureus. The in vitro antibacterial activity was determined by the Agar Ditch technique using DMF (polar) and 1,4-dioxane (non polar) as solvents. The Schiff bases showed greater activity than theirmetal complexes; themetal complexes showed differential effects on the bacterial strains investigated and the solvent used, suggesting that the antibacterial activity is dependent on the molecular structure of the compound, the solvent used and the bacterial strain under consideration. The Schiff base ADS3 in the polar solvent DMF showed better antibacterial activity towards the investigated bacterial strains. Amongst the four metals, Zn showed the best antibacterial activity followed by Fe in 1,4-dioxane while Ni followed by Zn and Fe showed the best antibacterial activity in DMF. P. vulgaris was the most resistant bacteria.

scholarly journals Crystal structure of {2-[({2-[(2-aminoethyl)amino]ethyl}imino)methyl]-6-hydroxyphenolato-κ4N,N′,N′′,O1}(nitrato-κO)copper(II) ethanol 0.25-solvate

2015 ◽  
Vol 71 (11) ◽  
pp. m205-m206 ◽  
Author(s):  
Shabana Noor ◽  
Sarvendra Kumar ◽  
Suhail Sabir ◽  
Rüdiger W. Seidel ◽  
Richard Goddard
Keyword(s):  
Crystal Structure ◽  
Schiff Base ◽  
Hydrogen Bonds ◽  
Schiff Base Ligand ◽  
Rotation Axis ◽  
Solvent Molecule ◽  
Nitrate Anion ◽  
Complex Molecules ◽  
Pyramidal Configuration ◽  
Axis Of Symmetry

In the crystal structure of the title mononuclear CuIIcomplex, [Cu(C11H16N3O2)(NO3)]·0.25C2H5OH, the complex molecules are linked by N—H...O and O—H...O hydrogen bonds, forming a dimer with an approximate non-crystallographic twofold rotation axis of symmetry. In the monomeric unit, the Cu2+ion exhibits a distorted square-pyramidal configuration, whereby the anionic [HL]−Schiff base ligand binds in a tetradentate fashionviathe O and the three N atoms which all are approximately coplanar. The O atom of a nitrate anion occupies the fifth coordination site, causing the CuIIatom to move slightly out of the approximate basal plane toward the bound nitrate group. The structure exhibits disorder of the ethanol solvent molecule.

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