scholarly journals Spectral, NLO and antimicrobial studies of Co(II), Ni(II) and Cu(II) complexes of Schiff base ligands of 2-amino-6-nitrobenzothiazole

2019 ◽  
Vol 84 (3) ◽  
pp. 267-275 ◽  
Author(s):  
Chinnaraj Kanagavalli ◽  
Murugesan Sankarganesh ◽  
Raja Dhaveethu ◽  
Manivannan Kalanithi
Keyword(s):  
Schiff Base ◽  
Second Harmonic ◽  
Aromatic Aldehydes ◽  
Antimicrobial Activities ◽  
Spectroscopic Studies ◽  
Molar Conductance ◽  
Spectroscopic Techniques ◽  
Schiff Base Ligands ◽  
Tetrahedral Geometry ◽  
Antimicrobial Studies

Novel series of Co(II), Ni(II) and Cu(II) transition metal complexes were synthesized from the Schiff base ligands HL1?HL4 derived from 2-amino-6- nitrobenzothiazole with various aromatic aldehydes, i.e., 4-methylbenzaldehyde, 4- ethylbenzaldehyde, 2-hydroxybenzaldehyde and 4-hydroxybenzaldehyde, respectively. The ligands HL1?HL4 and their metal (II) complexes were characterized by atomic absorption spectroscopy (AAS), magnetic susceptibility and molar conductance measurements, and UV?Vis, FT-IR and NMR spectroscopic techniques. The spectroscopic studies revealed that the complexes of HL1?HL3 coordinated in an octahedral environment and L4 in square planar/tetrahedral geometry. The ligands HL1?HL4 and their metal(II) complexes were screened for their antimicrobial activities against Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa and Candida albicans. The results suggest that the complexes of HL4 possess greater inhibition activity towards C. albicans. The nonlinear optics (NLO) activities of ligands HL1?HL4 were determined. The obtained results showed that ligands HL1 and HL2 have greater second harmonic generation (SHG) efficiency than HL3and HL4.

scholarly journals Synthesis, Characterization and Antimicrobial Studies of N1-[(1E)-1-(2-Hydroxyphenyl) ethylidene]-2-oxo-2H-chromene-3-carbohydrazide and its Metal Complexes

2009 ◽  
Vol 6 (3) ◽  
pp. 615-624 ◽  
Author(s):  
K. Siddappa ◽  
K. Mallikarjun ◽  
Tukaram Reddy ◽  
M. Mallikarjun ◽  
C. V. Reddy ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Magnetic Susceptibility ◽  
Schiff Base ◽  
Metal Complexes ◽  
Molar Conductance ◽  
Tetrahedral Geometry ◽  
H Nmr ◽  
Antimicrobial Studies ◽  
Mononuclear Complexes ◽  
Uv Visible

A new complexes of the type ML, MʹL and M″L [where M=Cu(II), Co(II), Ni(II) and Mn(II), Mʹ=Fe(III) and M″=Zn(II), Cd(II) and Hg(II) and L=N1-[(1E)-1-(2-hydroxyphenyl)ethylidene]-2-oxo-2H-chromene- 3-carbohydrazide (HL)] Schiff base have been synthesized and characterized by elemental analysis, magnetic susceptibility, molar conductance, IR,1H NMR, UV-Visible and ESR data. The studies indicate the HL acts as doubly monodentate bridge for metal ions and form mononuclear complexes. The complexes Ni(II), Co(II), Cu(II) Mn(II) and Fe(III) complexes are found to be octahedral, where as Zn(II), Cd(II) and Hg(II) complexes are four coordinated with tetrahedral geometry. The synthesized ligand and its metal complexes were screened for their antimicrobial activity.

scholarly journals Synthesis, Characterization and Antimicrobial Studies of 3-[(2-Hydroxy-quinolin-3-ylmethylene)-amino]-2-phenyl-3H-quinazolin-4-one and its Metal(II) Complexes

2008 ◽  
Vol 5 (1) ◽  
pp. 155-162 ◽  
Author(s):  
K. Siddappa ◽  
Tukaram Reddy ◽  
M. Mallikarjun ◽  
C. V. Reddy
Keyword(s):  
Antimicrobial Activity ◽  
Magnetic Susceptibility ◽  
Schiff Base ◽  
Elemental Analysis ◽  
Molar Conductance ◽  
Tetrahedral Geometry ◽  
H Nmr ◽  
Antimicrobial Studies ◽  
Mononuclear Complexes ◽  
Uv Visible

A new complexes of the type ML2 and M′L [where M=Cu(II), Co(II), and Ni(II) and M′= Zn(II), Cd(II) and Hg(II)]. L = 3-[(2-hydroxy-quinolin-3-ylmethylene)-amino]-2-phenyl-3H-quinazolin-4-one, (HQMAPQ) Schiff base have been synthesized and characterized by elemental analysis, magnetic susceptibility, molar conductance, IR,1H NMR, UV-Visible and ESR data. The studies indicate the HQMAPQ acts as doubly monodentate bridge for metal(II) ions and form mononuclear complexes. The complexes Ni(II), Co(II) and Cu(II) complexes are found to be octahedral, where as Zn(II), Cd(II) and Hg(II) complexes are four coordinated with tetrahedral geometry. The synthesized ligand and its metal(II) complexes were screened for their antimicrobial activity.

scholarly journals Synthesis, Spectral Characterization and Antimicrobial Studies of Co(II) Complexes with Tetradentate Schiff bases Derived from Ortho-Phthalaldehyde

2016 ◽  
Vol 9 (1) ◽  
pp. 1873-1882
Author(s):  
V. Sreenivas ◽  
G. Srikanth ◽  
Ch. Vinutha ◽  
M. Shailaja ◽  
P. Muralidhar Reddy ◽  
...  
Keyword(s):  
Schiff Base ◽  
Metal Complexes ◽  
Schiff Bases ◽  
Thermal Conductance ◽  
Antimicrobial Activities ◽  
Aqueous Methanol ◽  
Schiff Base Ligands ◽  
Potential Donor ◽  
Spectral Techniques ◽  
Antimicrobial Studies

A series of cobalt (II) complexes have been synthesized with Schiff bases derived from ortho-phthalaldehyde and various amines in aqueous methanol solution. The newly synthesized Schiff bases and their Co (II) complexes have been characterized  by elemental analysis, magnetic susceptibility, thermal, conductance measurements, mass, IR, electronic, 1H,13C-NMR spectral techniques. These ligands act as tetradentate species and coordinate to the metal center through the different potential donor atoms such as N, O and S. The probable octahedral structures have been assigned to these complexes. All the synthesized Schiff base ligands and Co(II) metal complexes have also been screened for their antimicrobial activities and metal complexes found to be more active than respective Schiff-base ligands.

scholarly journals Novel Zinc(II) Complexes of Heterocyclic Ligands as Antimicrobial Agents: Synthesis, Characterisation, and Antimicrobial Studies

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Ramesh S. Yamgar ◽  
Y. Nivid ◽  
Satish Nalawade ◽  
Mustapha Mandewale ◽  
R. G. Atram ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Schiff Base ◽  
Metal Complexes ◽  
Antimicrobial Agents ◽  
Spectroscopic Techniques ◽  
Schiff Base Ligands ◽  
E Coli ◽  
Gram Positive Bacteria ◽  
Antimicrobial Studies

The synthesis and antimicrobial activity of novel Zn(II) metal complexes derived from three novel heterocyclic Schiff base ligands 8-[(Z)-{[3-(N-methylamino)propyl]imino}methyl]-7-hydroxy-4-methyl-2H-chromen-2-one, 2-[(E)-{[4-(1H-1,2,4-triazol-1-ylmethyl)phenyl]imino}methyl]phenol, and (4S)-4-{4-[(E)-(2-hydroxybenzylidene)amino]benzyl}-1,3-oxazolidin-2-one have been described. These Schiff base ligands and metal complexes are characterised by spectroscopic techniques. According to these data, we propose an octahedral geometry to all the metal complexes. Antimicrobial activity of the Schiff base ligand and its metal complexes was studied against Gram negative bacteria:E. coliandPseudomonas fluorescens, Gram positive bacteria:Staphylococcus aureus,and also against fungi, that is,C. albicansandA. niger. Some of the metal complexes show significant antifungal activity (MIC < 0.2 μg/mL). The “in vitro” data has identified [Zn(NMAPIMHMC)2]·2H2O, [Zn(TMPIMP)2]·2H2O, and [Zn(HBABO)2]·2H2O as potential therapeutic antifungal agents againstC. albicansandA. niger.

scholarly journals Synthesis, Characterization and Antimicrobial Studies of Some New Tellurium(IV) Complexes Derived from 2-[(2-Hydroxyphenyl)imino methyl]-1-naphthol Schiff Base

2021 ◽  
Vol 34 (1) ◽  
pp. 183-190
Author(s):  
Mahak Dalal ◽  
Manish Kumar ◽  
K.K. Verma ◽  
Sapana Garg
Keyword(s):  
Schiff Base ◽  
Chemical Reactivity ◽  
Antimicrobial Activities ◽  
Molar Conductance ◽  
Bacterial Strains ◽  
Reactivity Descriptors ◽  
Pyramidal Geometry ◽  
Antimicrobial Studies ◽  
Chemical Reactivity Descriptors

This article reports the synthesis, characterization and antimicrobial screening of a tridentate 2-[(2-hydroxyphenyl)imino methyl]-1-naphthol ligand (H2AP) and its organotellurium(IV) complexes. Structural characterization of the synthesized ligand and complexes was confirmed by using FT-IR, 1H NMR, 13C NMR, UV-vis, mass spectrometry, molar conductance and elemental analysis. Geometry of all the synthesized compounds has been optimized and their DFT based chemical reactivity descriptors were calculated. DFT and spectral data studies revealed distorted square pyramidal geometry for the tellurium(IV) complexes. In vitro antimicrobial activities of the synthesized ligand and its tellurium(IV)complexes were evaluated against two Gram-positive, two Gram-negative bacterial strains and three fungal strains. The tellurium(IV) complexes exhibited promising activity as compared to the Schiff base ligand.

scholarly journals Synthesis, Spectroscopic and Antimicrobial Studies of Co(II), Cu(II) and Ni(II) Complexes of Schiff Base Derived from Citral and L-Histidine

2020 ◽  
Vol 32 (5) ◽  
pp. 1075-1081
Author(s):  
M. Bencela ◽  
S. Sudha Kumari
Keyword(s):  
Schiff Base ◽  
Schiff Base Ligand ◽  
Thermal Studies ◽  
Spectroscopic Studies ◽  
Biological Properties ◽  
Molar Conductance ◽  
Planar Geometry ◽  
Significant Activity ◽  
Antibacterial And Antifungal Activities ◽  
Antimicrobial Studies

A new series of [M(L)Y]X·nH2O (M = Co(II) and Cu(II), where Y = H2O, X= NO3 –, n = 3), M = Ni(II), where Y = H2O, X = NO3 –, n = 2) complexes with new Schiff base ligand (L) were synthesized by the condensation of citral and L-histidine. The ligand and its M(II) complexes were characterized based on elemental analysis, spectroscopic studies like FT-IR, electronic, 1H NMR, 13C NMR, ESR data, also accompanied with thermal studies, magnetic susceptibility and molar conductance measurements. In the light of these results, distorted square planar geometry were proposed for the M(II) complexes in which the M(II) centres are present in NNO coordination sphere. To evaluate the biological properties of the Schiff base ligand ( L) and its metal complexes, they were screened for their antibacterial and antifungal activities and the results indicate that the complexes exhibit the significant activity.

scholarly journals Structural and Biological Studies on Transition Metal Complexes of 4-Aminoantipyrine Derivative

2020 ◽  
Vol 32 (11) ◽  
pp. 2846-2854
Author(s):  
V. Soundaranayaki ◽  
A. Kulandaisamy
Keyword(s):  
Magnetic Susceptibility ◽  
Schiff Base ◽  
Antimicrobial Activities ◽  
Esr Spectra ◽  
Molar Conductance ◽  
Schiff Base Complexes ◽  
Binding Potential ◽  
Planar Geometry ◽  
Pyramidal Geometry ◽  
Biological Studies

Novel tetra dentate Cu(II), Ni(II), Co(II), VO(II) and Zn(II) Schiff base complexes have been synthesized from salicylidene-4-iminoantipyrine and tyrosine. The synthesized Schiff base complexes was characterized by powder X-ray diffraction studies (XRD), scanning electron microscopy (SEM), FT-IR, ESR, 1H NMR, 13C NMR, UV-vis, molar conductance and magnetic susceptibility measurements. The general formula of complexes was confirmed as [ML] type [M = Cu(II), Co(II), Zn(II), Ni(II) and VO(II); L = C27H24N4O4]. Magnetic susceptibility, IR and UV-vis, spectral data showed that all the complexes have square planar geometry except vanadyl complex which suggests square pyramidal geometry. Lower molar conductance values proved that all the chelates were non-electrolytic nature. The X-band ESR spectra of [CuL] and [VOL] complexes in DMSO solution suggest that the complexes were predominant covalent character. Powder XRD and SEM image pattern evidenced that all the compounds were crystalline in nature and their size ranges from 100-40 nm. Calf thymus DNA binding potential of [CuL] and [VOL] complexes shows that the binding occurs through intercalation mode with low binding constant. The analgesic, CNS, antiulcer and antimicrobial activities of the investigated compounds report reveals that the chelates were significant effect than free Schiff base.

scholarly journals Synthesis , Spectroscopic and Antibacterial Studies of Zinc(II) Complexes Derived from Salicylaldehyde, Leucylalanine and Glycylglycine

2012 ◽  
Vol 9 (3) ◽  
pp. 532-540 ◽  
Author(s):  
Baghdad Science Journal
Keyword(s):  
Schiff Base ◽  
Bacterial Species ◽  
Conductivity Measurement ◽  
Growth Inhibitor ◽  
Molar Conductance ◽  
Diffusion Method ◽  
Schiff Base Ligands ◽  
Elemental Analyses ◽  
L1 And L2

Two Schiff base ligands L1 and L2 have been obtained by condensation of salicylaldehyde respectively with leucylalanine and glycylglycine then their complexes with Zn(II)were prepared and characterized by elemental analyses , conductivity measurement , IR and UV-Vis .The molar conductance measurement indicated that the Zn(II) complexes are 1:1 non-electrolytes. The IR data demonstrated that the tetradentate binding of the ligands L1 and L2 . The in vitro biological screening effect of the investigated compounds have been tested against the bacterial species Staphlococcus aureus, Escherichia coil , Klebsiella pneumaniae, Proteus vulgaris and Pseudomonas aeruginosa by the disc diffusion method . A comparative study of inhibition values of the Schiff base ligands and their complexes indicated that the complexes exhibit higher antimicrobial activity than the free ligands . Zinc ions are proven to be essential for the growth-inhibitor effect. The extent of inhibition appeared to be strongly dependent on the initial cell density and on the growth medium .

Synthesis and Characterization of Cr (III) Macrocyclic Schiff Base Complexes

2021 ◽  
pp. 269-274
Author(s):  
Dharmendra Kumar Sahu ◽  
Shekhar Srivastava
Keyword(s):  
Schiff Base ◽  
Molar Conductance ◽  
Photoelectron Spectra ◽  
Schiff Base Complexes ◽  
Squaric Acid ◽  
Schiff Base Ligands ◽  
X Ray ◽  
Trimesic Acid ◽  
Macrocyclic Schiff Base

Ninety Cr(III) macrocyclic Schiff base complexes of the type [CrL_n^(1-10) X_2 ]X(Where X = Cl- or NO-3 or CH3COO- and = macrocyclic Schiff base ligands derived from condensation of trimesic acid or p-phthalic acid or squaric acid with different aliphatic diamines) have been synthesised and characterised by elemental analysis; molar conductance; electronic spectra; IR; magnetic moment and XPS i.e. X-ray Photoelectron spectra data. An octahedral geometry was established for them.

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