Chelates of nickel(II) and copper(II) with tridentate Schiff base formed by the condensation of S-benzyldithiocarbazate with benzoin

1978 ◽  
Vol 56 (15) ◽  
pp. 2000-2002 ◽  
Author(s):  
M. T. H. Tarafder ◽  
M. Akbar Ali
Keyword(s):  
Schiff Base ◽  
Spectral Data ◽  
General Formula ◽  
Schiff Base Ligand ◽  
Nickel Complexes ◽  
Planar Structure ◽  
Spectral Studies ◽  
Square Planar ◽  
Elemental Analyses ◽  
Tridentate Schiff Base

New complexes with the Schiff base ligand derived from S-benzyldithiocarbazate (NH2—NH—CSSCH2C6H5) have been prepared and characterized by elemental analyses, magnetic, conductometric, ir, and electronic spectral studies. The tridentate ONS Schiff base S-benzyl-β-N-(phenyl, phenylhydroxymethyl)methylenedithiocarbazate gave mono-ligand complexes with Ni(II) and Cu(II) having the general formula [MligandX] (M = Ni(II) and Cu(II); X = NO3, Cl, Br, NCS). A proposed square-planar structure for the nickel complexes is supported by magnetic and spectral data. A square-planar structure is also suggested for Cu(II) complexes. The ir results give evidence of the different bondings present in the complexes.

scholarly journals Nickel(II)-Based Building Blocks with Schiff Base Derivatives: Experimental Insights and DFT Calculations

Molecules ◽  
2021 ◽  
Vol 26 (17) ◽  
pp. 5316
Author(s):  
Néstor Novoa ◽  
Carolina Manzur ◽  
Thierry Roisnel ◽  
Samia Kahlal ◽  
Jean-Yves Saillard ◽  
...  
Keyword(s):  
Schiff Base ◽  
General Formula ◽  
Metal Ion ◽  
Density Functional ◽  
Building Blocks ◽  
Switching Behavior ◽  
Planar Geometry ◽  
Centrosymmetric Dimer ◽  
Square Planar ◽  
Tridentate Schiff Base

We have recently reported a series of neutral square planar tridentate Schiff base (L) complexes of the general formula [(L)M(py)], showing relatively high first-order hyperpolarizabilities and NLO redox switching behavior. In the present study, new members of this family of compounds have been prepared with the objective to investigate their potential as building blocks in the on-demand construction of D-π-A push–pull systems. Namely, ternary nickel(II) building blocks of general formula [(LA/D)Ni(4-pyX)] (4–7), where LA/D stands for an electron accepting or donating dianionic O,N,O-tridentate Schiff base ligand resulting from the monocondensation of 2-aminophenol or its 4-substituted nitro derivative and β-diketones R-C(=O)CH2C(=O)CH3 (R = methyl, anisyl, ferrocenyl), and 4-pyX is 4-iodopyridine or 4-ethynylpyridine, were synthesized and isolated in 60–78% yields. Unexpectedly, the Sonogashira cross-coupling reaction between the 4-iodopyridine derivative 6 and 4-ethynylpyridine led to the formation of the bis(4-pyridyl) acetylene bridged centrosymmetric dimer [{(LD)Ni}2(µ2-py-C≡C-py)] (8). Complexes 4–8 were characterized by elemental analysis, FT-IR and NMR spectroscopy, single crystal X-ray diffraction and computational methods. In each compound, the four-coordinate Ni(II) metal ion adopts a square planar geometry with two nitrogen and two oxygen atoms as donors occupying trans positions. In 8, the Ni…Ni separation is of 13.62(14) Å. Experimental results were proved and explained theoretically exploiting Density Functional Theory calculations.

Square Planar Complexes of Cu(II) with an N2O Donor Set of a New Schiff Base Ligand: Synthesis and Structural Aspects

2004 ◽  
Vol 59 (6) ◽  
pp. 655-660 ◽  
Author(s):  
Pritha Talukder ◽  
Amitabha Datta ◽  
Samiran Mitra ◽  
Georgina Rosair
Keyword(s):  
Schiff Base ◽  
Crystal Structures ◽  
Schiff Base Ligand ◽  
Condensation Product ◽  
Planar Geometry ◽  
Square Planar ◽  
Square Planar Complexes ◽  
Tridentate Schiff Base ◽  
Copper Centre ◽  
Structural Aspects

The title compounds, [Cu(C16H23N2O)SCN] (1) and [Cu(C16H23N2O)N3] (2), containing a tridentate Schiff base ligand, which is the 1:1 condensation product of benzoylacetone and 2- diethylaminoethylamine, have been synthesised and their crystal structures determined. The structure of 1 is based on a four coordinate copper centre with square-planar geometry formed by the N2O donor set of the Schiff base and an N atom of the thiocyanate anion. A similar arrangement occurs in 2 with the N2O donor set of the Schiff base and an N atom of the azide anion. The Cu-N and Cu-O distances are 1.924(8), 2.073(8), 1.927(9) and 1.910(6)Å , for 1 and 1.960(4), 2.050(4), 1.935(4) and 1.907(3) for 2, respectively.

A novel method for copper(ii) mediated region-selective bromination of aromatic rings under mild conditions

RSC Advances ◽  
2016 ◽  
Vol 6 (66) ◽  
pp. 61214-61220 ◽  
Author(s):  
Samim Khan ◽  
Subrata Jana ◽  
Michael G. B. Drew ◽  
Antonio Bauza ◽  
Antonio Frontera ◽  
...  
Keyword(s):  
Schiff Base ◽  
Complex Formation ◽  
Aromatic Ring ◽  
Schiff Base Ligand ◽  
Aromatic Rings ◽  
Mild Conditions ◽  
Square Planar ◽  
Novel Method ◽  
Tridentate Schiff Base

A square planar copper(ii) complex has been synthesized using a tridentate Schiff base ligand H2L and characterized. During complex formation, bromination at the 4 position of the aromatic ring of the Schiff base ligand has taken place.

scholarly journals Synthesis, Spectral Characterization and Antimicrobial Evaluation of New Metal Complexes of Novel Schiff Base Derived from 4,6-dihydroxy-1,3-phenylenediethanone

2021 ◽  
Author(s):  
Yasmin mamdoh hussien Ahmed ◽  
Gehad G. Mohamed
Keyword(s):  
Staphylococcus Aureus ◽  
Schiff Base ◽  
Schiff Base Ligand ◽  
Magnetic Moment ◽  
Magnetic Measurements ◽  
Diffusion Method ◽  
Spectral Studies ◽  
Conductivity Measurements ◽  
Absorption Bands ◽  
Elemental Analyses

Abstract A new tetradentate Schiff base ligand was prepared from condensation of 4,6-dihydroxy-1,3-phenylenediethanone with ethane-1,2-diylbis(oxy)diethanamine. The ligand forms complexes in good yield. The Schiff base and its complexes were characterized by analytical (CHN elemental analyses, solubility, melting point, conductivity) measurements, spectral (IR, UV-vis, 1H NMR and MS) and magnetic measurements. The elemental analyses, Uv-vis spectra, and room temperature magnetic moment data and theoretically through density function theory were used as characterizing techniques in supporting of further interpretation of the complexes structures. The results of elemental analyses, EI-mass and conductivity measurements confirmed the stoichiometry of the ligand and its complexes while the characteristic absorption bands and resonance peaks in IR and NMR spectra confirmed the formation of the ligand frameworks around the metal ions. The octahedral environment for complexes derived from Schiff base ligand have been confirmed on the basis of results of electronic and diffused reflectance spectral studies and magnetic moment measurements. Detailed studies of the thermal properties of the Schiff base ligand and complexes were investigated by thermogravimetric technique. Moreover, the molecular docking into (PDB: 6NE0) was the DNA binding and supports the experimental finding and 6IY0 Crystal structure of conserved hypothetical protein SAV0927 from Staphylococcus aureus subsp. aureus Mu50. The synthesized ligand and its complexes were tested for in vitro antimicrobial activity against Candida albicans, Bacillus subtilis, Aspergillus flavus, Escherichia coli, Pseudomonas aeruginosa and Staphylococcus aureus by using agar-well diffusion method.

Synthesis, crystal structures, spectral studies and reactivity of square planar copper(II) complexes containing Schiff base ligand

2013 ◽  
Vol 66 (4) ◽  
pp. 568-579 ◽  
Author(s):  
Poulami Pattanayak ◽  
Jahar Lal Pratihar ◽  
Debprasad Patra ◽  
Chia-Her Lin ◽  
Paula Brandão ◽  
...  
Keyword(s):  
Schiff Base ◽  
Crystal Structures ◽  
Schiff Base Ligand ◽  
Spectral Studies ◽  
Square Planar

scholarly journals Designing, synthesis and spectral characterization of Schiff base transition metal complexes: DNA cleavage and antimicrobial activity studies

2008 ◽  
Vol 73 (11) ◽  
pp. 1063-1071 ◽  
Author(s):  
N. Raman ◽  
Syed Ali ◽  
Dhaveethu Raja
Keyword(s):  
Magnetic Susceptibility ◽  
Schiff Base ◽  
Transition Metal ◽  
Metal Complexes ◽  
Spectral Data ◽  
Transition Metal Complexes ◽  
Metal Ion ◽  
Spectral Studies ◽  
Central Metal ◽  
Elemental Analyses

A new series of transition metal complexes of Cu(II), Ni(II), Co(II) and Zn(II) have been designed and synthesized using a Schiff base (L) derived from 4-aminoantipyrine, benzaldehyde and o-phenylenediamine. The structural features were derived from their elemental analyses, magnetic susceptibility and molar conductivity, as well as from mass, IR, UV-Vis, 1H-NMR and ESR spectral studies. The FAB mass spectral data and elemental analyses showed that the complexes had a composition of the ML type. The UV-Vis and ESR spectral data of the complexes suggested a square-planar geometry around the central metal ion. The magnetic susceptibility values of the complexes indicated that they were monomeric in nature. Antimicrobial screening tests were also performed against four bacteria, viz. Salmonella typhi, Staphylococcus aureus, Escherichia coli, and Bacillus subtilis and three fungi, viz. Aspergillus niger, Aspergillus flavus and Rhizoctonia bataicola. These data gave good results in the presence of metal ion in the ligand system. The nuclease activity of the above metal complexes shows that only the copper complex cleaves CT DNA in the presence of an oxidant.

π–π Dimerization of a mono(pyridyl–imine) platinum(II) chelate

2012 ◽  
Vol 68 (7) ◽  
pp. m189-m193
Author(s):  
Rosanne C. Salmond ◽  
Orde Q. Munro
Keyword(s):  
Schiff Base ◽  
Schiff Base Ligand ◽  
Pyridine Ring ◽  
Chloride Ion ◽  
Complex Salt ◽  
Title Complex ◽  
Lateral Shift ◽  
Square Planar ◽  
Tridentate Schiff Base

The cation of the title complex salt, chlorido{2,2-dimethyl-N-[(E)-1-(pyridin-2-yl)ethylidene]propane-1,3-diamine}platinum(II) tetrafluoridoborate, [PtCl(C12H19N3)]BF4, exhibits a nominally square-planar PtIIion coordinated to a chloride ion [Pt—Cl = 2.3046 (9) Å] and three unique N-atom types,viz.pyridine, imine and amine, of the tridentate Schiff base ligand formed by the 1:1 condensation of 1-(pyridin-2-yl)ethanone and 2,2-dimethylpropane-1,3-diamine. The cations are π-stacked in inversion-related pairs (dimers), with a mean plane separation of 3.426 Å, an intradimer Pt...Pt separation of 5.0785 (6) Å and a lateral shift of 3.676 Å. The centroid (Cg) of the pyridine ring is positioned approximately over the PtIIion of the neighbouring cation (Pt...Cg= 3.503 Å).

scholarly journals Spectral, Theoretical and Biological Studies of 3-((4-Mercaptophenyl)imino)- 1-phenylindolin-2-one Schiff Base and Its Organotellurium(IV) Complexes

2021 ◽  
Vol 33 (8) ◽  
pp. 1749-1756
Author(s):  
Manish Kumar ◽  
Poonam Jangra Darolia ◽  
Nidhi Antil ◽  
Mahak Dalal ◽  
Jitender Narwal ◽  
...  
Keyword(s):  
Schiff Base ◽  
Schiff Base Ligand ◽  
Molar Conductance ◽  
Spectral Studies ◽  
Receptor Proteins ◽  
E Coli ◽  
Biological Studies ◽  
Elemental Analyses ◽  
Ft Ir ◽  
Bacteria And Fungi

Schiff base ligand (3-((4-mercaptophenyl)imino)-1-phenylindolin-2-one) of 1-phenylindoline-2,3-dione and 4-aminothiophenol was synthesized by refluxing. Organotellurium(IV) complexes of type (RTeCl3.NPhIATP and R2TeCl2.NPhIATP, where R = 4-hydroxyphenyl, 4-methoxyphenyl and 3-methyl-4-hydroxyphenyl, NPhIATP = Schiff base ligand). The ligand and its organotellurium(IV) complexes (9a-f) were characterized by FT-IR, molar conductance, elemental analyses, UV-vis, mass, 1H & 13C NMR spectral studies. Geometry of all the compounds were optimized and octahedral geometry have been proposed for all the tellurium(IV) complexes. Molecular docking was studied to find the binding interactions between ligand (NPhIATP) and receptor proteins: E. coli (3t88) and S. aureus (3ty7). The antimicrobial activity of ligand and its tellurium(IV) complexes have been screened against bacteria and fungi. All the organotellurium(IV) complexes complexes showed good activity to ligand towards different studied microorganisms.

scholarly journals Tridentate hydrazido-hydrazones vanadium complexes. Synthesis, properties and biological activity

2019 ◽  
Vol 4 (1) ◽  
pp. 9-20 ◽  
Author(s):  
Janusz Szklarzewicz ◽  
Anna Jurowska ◽  
Maciej Hodorowicz ◽  
Dariusz Matoga ◽  
Ryszard Gryboś ◽  
...  
Keyword(s):  
Schiff Base ◽  
Schiff Base Ligand ◽  
Distorted Octahedral Geometry ◽  
Vanadium Complexes ◽  
Equatorial Position ◽  
Acceptor Center ◽  
Distorted Octahedral ◽  
Elemental Analyses ◽  
Synthesis Properties ◽  
Tridentate Schiff Base

Nine new vanadium complexes, with tridentate Schiff base ligand based on 3,5-di-tert-butyl-2-hydroxybenzaldehyde and different hydrazides, are described and characterized. The X-ray crystal structure of complex 8 shows distorted octahedral geometry of vanadium, with ONO ligand in equatorial position. The tridentate Schiff base ligand forms six membered and five-membered chelate rings at the V(V) acceptor center, with the corresponding bite angles being 82.97(9)˚ and 74.48(9)˚. The molecules are gathered by means of intermolecular O-H∙∙∙N hydrogen bond and layered by π∙∙∙π interactions involving the pyridine and phenolate rings. Such interactions expand the structure along the crystallographic a axis. The complexes were characterized by the elemental analyses, IR, UV-Vis, EPR spectroscopy, cyclic voltammetry, thermogravimetry and magnetic susceptibility measurements. The stabilization role of co-ligands is discussed. The cytotoxicity versus HepG2 hepatocytes and inhibition of human recombinant PTP1B was studied.

Azaoxa Macrocyclic and Acyclic Complexesof Lanthanides

1998 ◽  
Vol 63 (3) ◽  
pp. 363-370 ◽  
Author(s):  
Violetta Patroniak-Krzyminiewska ◽  
Wanda Radecka-Paryzek
Keyword(s):  
Schiff Base ◽  
Spectral Data ◽  
Macrocyclic Ligand ◽  
Lanthanide Ions ◽  
H Nmr ◽  
Elemental Analyses ◽  
Acyclic Complexes ◽  
Schiff Base Cyclocondensation

The template reactions of 2,6-diacetylpyridine with 3,6-dioxaoctane-1,8-diamine in the presence of dysprosium(III), thulium(III) and lutetium(III) chlorides and erbium(III) perchlorate produce the complexes of 15-membered macrocyclic ligand with an N3O2 set of donor atoms as a result of the [1+1] Schiff base cyclocondensation. In contrast, analogous reactions involving the lighter lanthanide ions (lanthanum(III), samarium(III) and europium(III)) yield the acyclic complexes with terminal acetylpyridyl groupings as products of the partial [2+1] condensation. The complexes were characterized by spectral data (IR, UV-VIS, 1H NMR, MS), and thermogravimetric and elemental analyses.

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