An Efficient Catalytic Method for the C-N Acylation of Heterocycles by Schiff Base Co(II), Ni(II), Cu(II) and Zn(II) Transition Metal Complexes..

2020 ◽  
Vol 17 ◽  
Author(s):  
Sujit Hegade ◽  
Gautam Gaikwad ◽  
Yuvraj Jadhav ◽  
Sanjay Chavan ◽  
Ganpatrao Mulik
Keyword(s):  
Schiff Base ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Acetyl Chloride ◽  
Structural Type ◽  
High Thermal Stability ◽  
Schiff Base Complexes ◽  
Catalytic Method ◽  
X Ray

: The catalytic activity of Schiff base Co(II), Ni(II), Cu(II) and Zn(II) transition metal complexes were tested for N-Acylation of heterocycles with acetyl chloride. It is observed that all the complexes worked as the efficient catalysts. The Structural type of the complexes were studied by X-ray powder diffractogram (XRD). The mixed ligand complexes with PPh3 ligand show greater activity as compared to Phen complexes and Schiff base complexes. Especially complex [Ni(L)(PPh3)2Cl2] efficiently worked as catalyst because of high thermal stability (TGA-DSC) and large catalytic surface area (BET).

X-ray Crystal Structure of the N-(2-hydroxy-1-naphthalidene)phenylglycine Schiff Base. Synthesis and Characterization of its Transition Metal Complexes

2006 ◽  
Vol 31 (5) ◽  
pp. 580-585 ◽  
Author(s):  
Kalagouda B. Gudasi ◽  
Manjula S. Patil ◽  
Ramesh S. Vadavi ◽  
Rashmi V. Shenoy ◽  
Siddappa A. Patil ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Schiff Base ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Synthesis And Characterization ◽  
X Ray

Synthesis, spectral characterization and some biological studies of transition metal complexes with Schiff base ligand containing N,O and S as donor atoms

2017 ◽  
Vol 13 (9) ◽  
pp. 6513-6519
Author(s):  
Anil Kumar M R ◽  
Shanmukhappa S ◽  
Rangaswamy B E ◽  
Revanasiddappa M
Keyword(s):  
Schiff Base ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Schiff Base Ligand ◽  
Dna Cleavage ◽  
Schiff Base Complexes ◽  
Spectral Studies ◽  
Planar Geometry ◽  
Biological Studies

Transition metal complexes of Cu(II), Co(II), Ni(II), Zn(II), Cd(II) and Mn(II) have been synthesized with the Schiff base ligand 5-Sub-N-(2-mercaptophenyl)salicylideneimine. Elemental analysis of these complexes suggest that these metal ions forms complexes of type ML(H2O)stoichiometry for Cu(II), Co(II), Ni(II), Zn(II), Cd(II) and Mn(II). The ligand behaves as tridentate and forms coordinate bonds through O, S and N atoms. Magnetic susceptibility, IR, UV – Visible, Mass and ESR spectral studies suggest that Cu(II), Ni(II) complexes posses square planar geometry, whereas Co(II), Zn(II), Cd(II) and Mn(II) complexes posses tetrahedral geometry. The complexes were tested for their antimicrobial activity against the bacterial strains Staphylococcus aureus and Bacillus subtilis.The Schiff base metal complexes evaluated for their antifungal activity against the fungi A. niger and C. oxysporum. The DNA cleavage studies of Schiff base complexes werestudied using Calf – Thymus DNA by agarose gel electrophoresis method.

Syntheses and Structure Investigations of 3d Transition Metal Complexes with a Flexible N4O2-Donor Hexadentate Schiff-Base Ligand

2017 ◽  
Vol 70 (5) ◽  
pp. 581 ◽  
Author(s):  
Kyle J. Howard-Smith ◽  
Alexander R. Craze ◽  
Mohan Badbhade ◽  
Christopher E. Marjo ◽  
Timothy D. Murphy ◽  
...  
Keyword(s):  
Schiff Base ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Schiff Base Ligand ◽  
High Resolution Mass Spectrometry ◽  
Molecular Structures ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structure Investigations

The syntheses and structure investigations of four new 3d transition metal complexes (1–4) with a flexible N4O2-donor hexadentate Schiff-base ligand are described; three complexes (1, 2, and 4) of FeIII, CoIII, and CuII metal ions have been investigated by UV-vis, FT-IR, high-resolution mass spectrometry (HR-MS), and scanning electron microscopy–electron dispersive spectroscopy, as well as single crystal X-ray diffraction. The X-ray structure of NiII complex 3 is also reported. The molecular structures of the complexes (1–3) demonstrate distorted octahedral coordination geometry, each exhibiting 1 : 1 (M : L) ratios and the CuII complex 4 shows a trinuclear structure with a CuII : L ratio of 3 : 2 in the solid state, which has been proven by X-ray diffraction. On the other hand, a mononuclear species of the CuII complex is formed in solution, which has been identified by electrospray ionization HR-MS.

Synthesis, Crystal Structures and Properties of Two Transition Metal Complexes Based on 4, 4'-{[2, 2'-(ethane-1, 2-bicarboxymethyl)] amino-bis(acetyl)} Dibenzoic Acid

2014 ◽  
Vol 997 ◽  
pp. 255-259
Author(s):  
Ying Ying Bing ◽  
Hong Gao ◽  
Ming Hu
Keyword(s):  
Thermal Stability ◽  
Thermogravimetric Analysis ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
High Thermal Stability ◽  
Two Dimensional ◽  
Hydrothermal Conditions ◽  
X Ray ◽  
Structures And Properties

Two isostructural transition metal complexes based on the 4,4'-{[2,2'-(ethane-1,2-bicarboxymethyl)] amino-bis (acetyl)} dibenzoic acid (H4L) were synthesized under hydrothermal conditions, namely, [M(H2L)(H2O)]·3H2O (M=Ni, 1 ; Co, 2). The two compounds were structurally characterized by infrared spectra, thermogravimetric analysis and single crystal X-ray diffractions. Compounds 1-2 are mononuclear units and further extended to generate the two dimensional structures by hydrogen-bonds and π-π interactions. Compounds 1 exhibit the high thermal stability.

Übergangsmetallkomplexe mit Schwefelliganden, XCII. Oxidation von Thiolat-Amin- zu Schiffbase-Eisen(II)-Komplexen. Röntgenstrukturanalyse und Reaktivität von [Fe('N2S2')]2 (′N2S2′2- = Glyoxal-bis(2-mercaptoanil)(2 – )) / Transition Metal Complexes with Sulfur Ligands, XCII. Oxidation of Thiolate Amine to Schiff Base Iron(II) Complexes. X-Ray Structure Analysis and Reactivity of [Fe(′N2S2')]2 (′N2S2′2- = Glyoxal-bis(2-mercaptoanil)(2–))

1992 ◽  
Vol 47 (11) ◽  
pp. 1545-1550 ◽  
Author(s):  
Dieter Sellmann ◽  
Marcus Hannakam ◽  
Falk Knoch ◽  
Matthias Moll
Keyword(s):  
Schiff Base ◽  
Transition Metal ◽  
Metal Complexes ◽  
Single Crystal ◽  
Structure Analysis ◽  
Transition Metal Complexes ◽  
X Ray

Oxidation of [Fe(CO)2(′N2H2S2′')] (1) (′N2H2S2'2- = 1,2-ethanediamine-N,N′-bis(2-benzenethiolate)(2—)) gave insoluble [Fe(′N2S2')]2 (2) ('N2S2'2- = glyoxal-bis(2-mercaptoanil)(2—)). Dinuclear, thiolato-bridged 2 was characterized by single crystal X-ray structure analysis. It does not react with CO or H2, but yields bis or mono adducts with PR3 (R = Me, n-Bu, Cy).

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