scholarly journals Synthesis, characterization and biological study of Cu(II) complexes of aminopyridine and (aminomethyl)pyridine Schiff bases

2018 ◽  
Vol 83 (7-8) ◽  
pp. 809-819 ◽  
Author(s):  
Abdullahi Sobola ◽  
Gareth Watkins ◽  
Brecht van
Keyword(s):  
Antimicrobial Activity ◽  
Schiff Base ◽  
Biological Study ◽  
Planar Geometry ◽  
Molecular Formula ◽  
Schiff Base Ligands ◽  
Monoclinic System ◽  
1H And 13C Nmr ◽  
Square Planar

The synthesis, characterization and antimicrobial activity determination of some aminopyridine- and (aminomethyl)pyridine?salicylaldimine copper(II) complexes were realized. The ligands, L1?L6, were prepared by condensing salicylaldehyde and o-vanillin with 2- and 3-amino- and (aminomethyl)pyridine, respectively. The complexes were characterized by micro-analytical, electronic, infrared and conductivity data. The structures of the Schiff base ligands were further confirmed from 1H- and 13C-NMR spectral data. This study established that salicylaldimine ligands could coordinate as neutral species via the imine-N and the undeprotonated phenolic-O. The complexes have the molecular formula: [CuLCl], [Cu(LH)2Cl2]?xH2O or [Cu(LH)Cl(H2O)]Cl. The X-ray crystal structure of [CuL6Cl] indicated a square planar geometry with the Schiff base ligand coordinated to the Cu(II) ion as a tridentate monobasic, N2O, ligand. The crystals crystallized in a monoclinic system with P21/c space group. All the ligands and their Cu(II) complexes were screened for their antimicrobial activity against Staphylococcus aureus subsp. aureus ATCC? 6538?*, Bacillus subtillis subsp. spizizenii ATCC? 6633?*, Escherichia coli ATCC? 8739?* and Candida albicans ATCC? 2091?* using agar diffusion and broth dilution techniques. The presence of the methoxyl group enhanced the antimicrobial activity of the salicylaldimine Schiff base ligands.

Bis[6-(cyclopentyliminomethyl)-2-methoxyphenolato]nickel(II)

2007 ◽  
Vol 63 (3) ◽  
pp. m704-m705 ◽  
Author(s):  
Xiao-Fan Zhao
Keyword(s):  
Schiff Base ◽  
Planar Geometry ◽  
Inversion Symmetry ◽  
Schiff Base Ligands ◽  
Square Planar

The molecule of the title mononuclear compound, [Ni(C13H16NO2)2], possesses crystallographic inversion symmetry. The Ni atom, lying on the inversion centre, is four-coordinated in a square-planar geometry by two Schiff base ligands.

Bis[2-(4-chlorophenyliminomethyl)phenolato]nickel(II)

2006 ◽  
Vol 62 (5) ◽  
pp. m1066-m1068 ◽  
Author(s):  
Sanjun Peng ◽  
Congshan Zhou ◽  
Tao Yang
Keyword(s):  
Schiff Base ◽  
Dihedral Angle ◽  
Planar Geometry ◽  
Inversion Center ◽  
Schiff Base Ligands ◽  
Square Planar

In the title mononuclear nickel(II) complex, [Ni(C13H9ClNO)2], the NiII atom lies on an inversion center and is coordinated by the N and O atoms of the two Schiff base ligands in a square-planar geometry. The dihedral angle between the two chlorophenyl rings is 39.5 (3)°.

scholarly journals Bis[S-hexyl (E)-3-(4-methoxybenzylidene)dithiocarbazato-κ2N3,S]palladium(II)

IUCrData ◽  
2016 ◽  
Vol 1 (4) ◽  
Author(s):  
E. Zangrando ◽  
M. S. Begum ◽  
M. B. H. Howlader ◽  
M. C. Sheikh ◽  
R. Miyatake
Keyword(s):  
Schiff Base ◽  
Chelate Ring ◽  
Title Complex ◽  
Planar Geometry ◽  
Inversion Center ◽  
Schiff Base Ligands ◽  
Complex Molecules ◽  
Planar Configuration ◽  
Square Planar ◽  
The Mean

In the title complex, [Pd(C15H21N2OS2)2], the PdIIion is located on a crystallographic inversion center. The two Schiff base ligands in a deprotonated imino thiolate form chelate the metal atomviathe azomithine N and thiolate S atoms in atrans-square-planar configuration as imposed by the crystal symmetry. The complex has an approximately planar geometry with the exception of the hexyl chains; the mean plane of the five-membered chelate ring makes a dihedral angle of 15.43 (5)° with the benzene ring. In the crystal, the complex molecules are stacked along theaaxis.

scholarly journals Synthesis, Characterization and Investigation of Antimicrobial Activity of a New Schiff Base, 2-(((2-((4-hydroxybenzylidene) amino)ethyl)imino)methyl) Phenol and Its Cu(II) and Ni(II) Complexes

2020 ◽  
pp. 30-38
Author(s):  
Musarat Farjana Yesmin ◽  
Farzana Khanm Camellia ◽  
Modina Bashar ◽  
Md. Sajjad Hossain ◽  
Saiyad Nasira ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Schiff Base ◽  
Spectral Studies ◽  
Planar Geometry ◽  
Conductivity Measurements ◽  
Physico Chemical ◽  
Square Planar ◽  
Infrared Spectral ◽  
Chemical Techniques ◽  
And Staphylococcus Aureus

New complexes of Cu (II) and Ni (II) of the Schiff Base, 2-(((2-((4-hydroxybenzylidene) amino)ethyl)imino)methyl) phenol were synthesized and characterized by analytical and  physico-chemical techniques including magnetic susceptibility, conductivity measurements, electronic and IR spectral studies. The infrared spectral studies revealed the tetra-dentate nature of the Schiff base in the complexes. On the basis of all characterizations, square- planar geometry has proposed for all the obtained complexes. The complexes showed moderate antimicrobial activity against Escherichia coli and Staphylococcus aureus.

scholarly journals Mononuclear and Tetranuclear Copper(II) Complexes Bearing Amino Acid Schiff Base Ligands: Structural Characterization and Catalytic Applications

Molecules ◽  
2021 ◽  
Vol 26 (23) ◽  
pp. 7301
Author(s):  
Karla-Alejandra López-Gastélum ◽  
Enrique F. Velázquez-Contreras ◽  
Juventino J. García ◽  
Marcos Flores-Alamo ◽  
Gerardo Aguirre ◽  
...  
Keyword(s):  
Schiff Base ◽  
Tridentate Ligand ◽  
Planar Geometry ◽  
X Ray Diffraction ◽  
Schiff Base Ligands ◽  
X Ray ◽  
Square Planar ◽  
Catalytic Applications ◽  
Amino Acid Schiff Base ◽  
Very High

Two new glycine-Schiff base copper(II) complexes were synthesized. Single crystal X-ray diffraction (SCXRD) allowed us to establish the structure of both complexes in the solid state. The glycine-Schiff base copper(II) complex derived from 2′-hydroxy-5′-nitroacetophenone showed a mononuclear hydrated structure, in which the Schiff base acted as a tridentate ligand, and the glycine-Schiff base copper(II) complex derived from 2′-hydroxy-5′-methylacetophenone showed a less common tetranuclear anhydrous metallocyclic structure, in which the Schiff base acted as a tetradentate ligand. In both compounds, copper(II) had a tetracoordinated square planar geometry. The results of vibrational, electronic, and paramagnetic spectroscopies, as well as thermal analysis, were consistent with the crystal structures. Both complexes were evaluated as catalysts in the olefin cyclopropanation by carbene transference, and both led to very high diastereoselectivity (greater than 98%).

{1-[2-(Methylamino)ethyliminomethyl]naphthalen-2-olato}thiocyanatocopper(II)

2006 ◽  
Vol 62 (7) ◽  
pp. m1533-m1534 ◽  
Author(s):  
Han-Na Hou
Keyword(s):  
Schiff Base ◽  
Schiff Base Ligand ◽  
Title Compound ◽  
Planar Geometry ◽  
Asymmetric Unit ◽  
Thiocyanate Anion ◽  
Square Planar

The title compound, [Cu(C14H15N2O)(NCS)], is a mononuclear copper(II) complex, with two molecules in the asymmetric unit. The CuII ion is coordinated by one O and two N atoms of a Schiff base ligand, and by one N atom of a thiocyanate anion, forming a square-planar geometry.

scholarly journals Unsymmetrical Schiff Base Functionalized as Monobasic Tridentate Ligand on Complexation with Some Transition Metal Ions

2012 ◽  
Vol 9 (2) ◽  
pp. 532-544
Author(s):  
Bibhesh K. Singh ◽  
Narendar Bhojak ◽  
Anant Prakash
Keyword(s):  
Schiff Base ◽  
Transition Metal Ions ◽  
Tridentate Ligand ◽  
Planar Geometry ◽  
Physico Chemical ◽  
Square Planar ◽  
Unsymmetrical Schiff Base ◽  
Mm2 Calculations ◽  
Microbial Potential

Cu(II), Co(II), Ni(II) and Mn(II) complexes of Schiff base derived from 2-aminophenol and pyrrole-2- carbaldehyde have been prepared. The complexes are formed by coordination of N and O atoms of the ligand. Their structures were characterized by physico-chemical and spectroscopic methods. Molecular structure of the complexes has been optimized by MM2 calculations and suggests a tetrahedral/ square planar geometry. The bio-efficacy of the ligand and their complexes has been examined against the growth of bacteriain vitroto evaluate their anti-microbial potential.

scholarly journals Crystal structure of bis(2-{1-[(E)-(4-fluorobenzyl)imino]ethyl}phenolato-κ2N,O)palladium(II)

2015 ◽  
Vol 71 (4) ◽  
pp. 350-353
Author(s):  
Amalina Mohd Tajuddin ◽  
Hadariah Bahron ◽  
Hamizah Mohd Zaki ◽  
Karimah Kassim ◽  
Suchada Chantrapromma
Keyword(s):  
Crystal Structure ◽  
Schiff Base ◽  
Hydrogen Bonds ◽  
Dihedral Angle ◽  
Title Complex ◽  
Asymmetric Unit ◽  
Schiff Base Ligands ◽  
Bond Lengths ◽  
Square Planar ◽  
Coordination Plane

The asymmetric unit of the title complex, [Pd(C15H13FNO)2], contains one half of the molecule with the PdIIcation lying on an inversion centre and is coordinated by the bidentate Schiff base anion. The geometry around the cationic PdIIcentre is distorted square planar, chelated by the imine N- and phenolate O-donor atoms of the two Schiff base ligands. The N- and O-donor atoms of the two ligands are mutuallytrans, with Pd—N and Pd—O bond lengths of 2.028 (2) and 1.9770 (18) Å, respectively. The fluorophenyl ring is tilted away from the coordination plane and makes a dihedral angle of 66.2 (2)° with the phenolate ring. In the crystal, molecules are linked into chains along the [101] direction by weak C—H...O hydrogen bonds. Weak π–π interactions with centroid–centroid distances of 4.079 (2) Å stack the molecules alongc.

scholarly journals Syntheses, Characterization, Crystal Structures and Antimicrobial Activity of Schiff Base Copper(II) Complexes Derived from 2-Bromo-6-((2-(isopropylamino) ethylimino)methyl)phenol

2021 ◽  
Vol 68 (4) ◽  
pp. 1008-1015
Author(s):  
Yong Yuan ◽  
Xi-Kun Lu ◽  
Gao-Qi Zhou ◽  
Xiao-Yang Qiu
Keyword(s):  
Antimicrobial Activity ◽  
Schiff Base ◽  
Single Crystal ◽  
Elemental Analysis ◽  
Structure Determination ◽  
Antimicrobial Activities ◽  
X Ray ◽  
Zwitterionic Form ◽  
Square Planar ◽  
Vis Spectroscopy

Three new copper(II) complexes, [Cu(LH)2]Br2 (1), [Cu(LH)2]NCS2 (2), and [Cu(LH)2](NO3)2 (3), where LH is the zwitterionic form of 2-bromo-6-((2-(isopropylamino)ethylimino)methyl)phenol (HL), were synthesized and characterized by elemental analysis, IR and UV-vis spectroscopy. The structures of the complexes were further confirmed by single crystal X-ray structure determination. All compounds are mononuclear copper(II) complexes. The Cu atoms in the complexes are coordinated by two imino N and two phenolate O atoms from two LH ligands, forming square planar coordination. The compounds were assayed for their antimicrobial activities.

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