scholarly journals Synthesis and characterization of a tetraaza macrocyclic ligand and its Cobalt(II), Nickel(II) and Copper(II) complexes

2010 ◽  
Vol 75 (7) ◽  
pp. 935-941 ◽  
Author(s):  
Sulekh Chandra ◽  
Monika Tyagi ◽  
Swati Agarwal
Keyword(s):  
Fungicidal Activity ◽  
Macrocyclic Ligand ◽  
Pathogenic Fungi ◽  
Molar Conductance ◽  
Spectral Studies ◽  
Conductance Data ◽  
Square Planar ◽  
Nitrogen Donor ◽  
Elemental Analyses

Co(II), Ni(II), and Cu(II) complexes with a tetradentate nitrogen donor [N4] macrocyclic ligand, viz 1,5,8,13-tetraaza-2,9-dimethyl-4,11- diphenylcyclotetradeca-2,4,4,11-tetraene were synthesized. Their structures were determined based on elemental analyses; molar conductance and magnetic susceptibility measurements; and IR, 1H-NMR (ligand), and electronic spectral studies. Based on analytical and molar conductance data, the complexes may be formulated as [M(L)Cl2] and [M?(L)]Cl2 [where M = Co(II) and Cu(II), and M? = Ni(II)] due to their non-electrolytic and 1:2 electrolytic nature. Based on spectral studies, an octahedral geometry was assigned for the Co(II) complex, whereas square-planar and tetragonal geometry were proposed for the Ni(II) and Cu(II) complexes, respectively. The synthesized ligand and its complexes were screened for fungicidal activity against two pathogenic fungi (i.e., Fusarium. moniliformae and Rhizoctonia solani) to assess their growth inhibiting potential.

scholarly journals Spectroscopic and biological approach in the characterization of Cr(III), Mn(II) and Co(II) complexes with a novel hexaazamacrocyclic ligand derived from semicarbazide

2009 ◽  
Vol 74 (12) ◽  
pp. 1413-1422 ◽  
Author(s):  
Sulekh Chandra ◽  
Archana Gautam
Keyword(s):  
Antimicrobial Agents ◽  
Macrocyclic Ligand ◽  
Free Ligand ◽  
Pathogenic Fungi ◽  
Molar Conductance ◽  
Octahedral Geometry ◽  
Spectral Studies ◽  
Plant Pathogenic Fungi

Complexes of Cr(III), Mn(II) and Co(II) with a novel 5,7,12,14-tetraphenyl- 1,2,4,8,10,11-hexaazacyclotetradecane-3,9-dione macrocyclic ligand, THTD (L), were synthesized and characterized by elemental analysis, molar conductance and magnetic susceptibility measurements, as well as by mass, 1H-NMR, IR, electronic and EPR spectral studies. Based on the spectral studies, an octahedral geometry was assigned for the Cr(III), Mn(II) and Co(II) complexes. The ligand and its complexes were screened in vitro against some species of bacteria and plant pathogenic fungi. The metal complexes were found to be more active antimicrobial agents than the free ligand from which they were derived.

scholarly journals Synthesis and Spectral Characterization of Mn(II) and Co(II) Complexes with Tetradentate Macrocyclic Ligand

2021 ◽  
Vol 33 (9) ◽  
pp. 2207-2211
Author(s):  
Usha Bansal ◽  
Samta Goyal ◽  
Swati Agrawal
Keyword(s):  
Metal Complexes ◽  
Infrared Spectra ◽  
Elemental Analysis ◽  
Magnetic Moment ◽  
Macrocyclic Ligand ◽  
Molar Conductance ◽  
Octahedral Geometry ◽  
Metal Salts ◽  
Spectral Studies

Manganese(II) and cobalt(II) complexes were synthesized with [N4] tetradentate macrocyclic ligand using different metal salts i.e. MnCl2, Mn(NO3)2, CoCl2 and Co(NCS)2. The ligand was prepared by condensation of glyoxal and carbahydrazide. All these were characterized by elemental analysis, molar conductance measurements, magnetic moment, IR, mass, electronic and EPR spectral studies. Elemental analysis indicates that the complexes have composition MLX2 where (X = Cl–, NO3 –,NCS–). All the complexes were found to be non-electrolytic in nature so can be formulated as [MLX2]. Infrared spectra of metal complexes suggest that the ligand behaves as tetradentate. On the basis of magnetic moment, electronic and EPR spectral data, all the metal complexes were found to be high spin with octahedral geometry.

scholarly journals Preparation and Characterization of Thiosemicarbazones Corrosion Inhibition Effect and the Antimicrobial and Anticancer Effect on their Metal Complexes

2017 ◽  
Vol 13 (3) ◽  
pp. 249
Author(s):  
Tahani I. Kashar ◽  
Marwa Abdel-Motaal ◽  
Khadija Emran ◽  
Noha A. Sukar
Keyword(s):  
Cast Iron ◽  
Molar Conductance ◽  
Spectral Studies ◽  
Breast Cancer Cell Lines ◽  
Human Breast ◽  
Anticancer Effect ◽  
Ic50 Value ◽  
Elemental Analyses ◽  
Mcf 7

Benzofurane and naphthofuranethiosemicarbazone ligands 2a (L1 )and 2b(L2) and their Cu(II), Co(II), Ni(II), and Pd(II) complexes have been synthesized and characterized by elemental analyses, molar conductance, magnetic susceptibility measurements, IR, NMR, and electronic spectral studies. IR spectra show that the ligands is coordinated to the metal ions in a didentate manner with N,S doner sites. In the presence of tow thiosemicarbazones ligands 2a(L1) and 2b(L2), the corrosion resistance of cast iron in 10.M H2SO4 increases in the order, 2b(L2) >2a(L1). The effect of studied ligands inhibits the corrosion of cast iron extent depending on the structure and high donation of π-electron present inhibitor. Co(II) and Pd (II) complexes possess higher antimicrobial activity than free ligands and other complexes. The [L1Pd Cl2]H2O complexe shows higher IC50 value of 4.6 µg/ml toward human breast cancer cell lines (MCF-7). For other complexes, they are in the range of 2.7– 4.3 µg/ml toward the former cells which is related to their metal complexing ability in enzymes.

scholarly journals SYNTHESIS AND CHARACTERIZATION OF MALONIC ACID DIHYDRAZIDE AND ITS METAL COMPLEXES

2013 ◽  
Vol 12 (24) ◽  
pp. 26-33
Author(s):  
Ramana Kumar KAKARLA ◽  
Raghavendra Guru Prasad ALURU ◽  
Srilalitha VINNAKOTA ◽  
RAO KRISHNA RAO, Ravindranath LAKSHMANA
Keyword(s):  
Metal Complexes ◽  
Molar Conductance ◽  
Spectral Studies ◽  
Enolic Form ◽  
Square Planar ◽  
Zinc Cadmium ◽  
Malonic Acid Dihydrazide ◽  
Formation Of Complexes ◽  
Methanolic Medium

A new series of complexes was synthesized by the reaction between malonyl dihydrazide (MAH) and manganese, copper, nickel, zinc, cadmium, cobalt and ferric salts in methanolic medium. The complexes were characterized by elemental analysis, molar conductance measurements, electronic, IR and 1H NMR spectral studies. Based on the results obtained, the stoichiometry of Fe(III)-MAH and Co(III)-MAH was proposed to be 1:3 and that for Cu(II)-MAH, Cd(II)-MAH, Zn(II)-MAH, Mn(II)-MAH, Ni(II)-MAH was proposed to be 1:2 (M:L). It was suggested that the nitrogen present in the azomethine (>C=N-) group of the enolic form present in the ligand was involved in the formation of complexes. A clear picturisation indicating the bonding sites were depicted for each complex. The metal complexes exhibit different geometries such as tetrahedral, square planar and octahedral arrangements.

scholarly journals Fertility Inhibitor Heterobimetallic Complexes of Platinum(II) and Palladium(II): Synthetic, Spectroscopic and Antimicrobial Aspects

2000 ◽  
Vol 7 (2) ◽  
pp. 105-113 ◽  
Author(s):  
Kripa Sharma ◽  
S. C. Joshi ◽  
R. V. Singh
Keyword(s):  
Sperm Morphology ◽  
Pathogenic Fungi ◽  
Reproductive Organs ◽  
Spectral Studies ◽  
Planar Geometry ◽  
Testicular Sperm ◽  
Heterobimetallic Complexes ◽  
Sperm Density ◽  
Square Planar ◽  
Elemental Analyses

Synthetic, spectroscopic and antimicrobial aspects of some fertility inhibitor heterobimetallic complexes have been carried out. These heterobimetallic chelates [M(C5H5N3)2M2'(R)4]Cl2 (M = Pd or Pt and M' = Si, Sn, Ti and Zr) have been successfully synthesinzed via the reaction of M(C5H7N3)2Cl2 with group four or fourteen dichlorides in 1:2 stoichiometric proportions. The products were characterized by elemental analyses, molecular weight determinations, magnetic susceptibility measurements, conductance, and IR multinuclear NMR and electronic spectral studies. A square planar geometry has been suggested for all the complexes with the help of spectral data. Conductivity data strongly suggest that chlorine atoms are ionic in nature due to which complexes behave as electrolytes. All the complexes have been evaluated for their antmicrobial effects on different species of pathogenic fungi and bacteria. The testicular sperm density, testicular sperm morphology, sperm motility, density of cauda epididymal spermatozoa and fertility in mating trails and biochemical parameters of reproductive organs have been examined and discussed.

scholarly journals Synthesis and spectral studies of Cu(II), Ni(II), Co(II), Mn(II), Zn(II) and Cd(II) complexes of a new macroacyclic ligand n,n’-bis(2-benzothiazolyl)-2,6-pyridinedicarboxamide

2006 ◽  
Vol 71 (5) ◽  
pp. 529-542 ◽  
Author(s):  
Kalagouda Gudasi ◽  
Siddappa Patil ◽  
Ramesh Vadavi ◽  
Rashmi Shenoy ◽  
Manjula Patil
Keyword(s):  
Liquid Nitrogen ◽  
Magnetic Moments ◽  
Thermal Studies ◽  
Liquid Nitrogen Temperature ◽  
Octahedral Geometry ◽  
Spectral Studies ◽  
Conductance Data ◽  
X Band ◽  
Elemental Analyses ◽  
Uv Visible

A new macroacyclic amide ligand N,N?-bis(2-benzothiazolyl)-2,6-pyridinedicarboxamide (BPD), formed by the condensation of 2,6-pyridinedicarbonyldichloride with 2-aminobenzothiazole and its Cu(II), Ni(II), Co(II), Mn(II), Zn(II) and Cd(II) complexes were synthesized. Their structures were elucidated on the basis of elemental analyses, conductance measurements, magnetic moments, spectral (IR, NMR UV-Visible, EPR and FAB) and thermal studies. The complexes exhibit an octahedral geometry around the metal center. Conductance data of the complexes suggested them to be 1:1 electrolytes. The pentadentate behavior of the ligand was proposed on the basis of spectral studies. The X-band EPR spectra of the Cu(II) and Mn(II) complexes in the polycrystalline state at room (300 K) and liquid nitrogen temperature (77 K) were recorded and their salient features are reported.

scholarly journals Synthesis, Spectroscopic, Molecular Structure, and Antibacterial Studies of Dibutyltin(IV) Schiff Base Complexes Derived from Phenylalanine, Isoleucine, and Glycine

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
Har Lal Singh ◽  
Jangbhadur Singh
Keyword(s):  
Amino Acids ◽  
Schiff Base ◽  
Schiff Bases ◽  
Molar Conductance ◽  
Schiff Base Complexes ◽  
Spectral Studies ◽  
E Coli ◽  
Elemental Analyses ◽  
In Vitro Antibacterial Activity

New series of organotin(IV) complexes and Schiff bases derived from amino acids have been designed and synthesized from condensation of1H-indole-2,3-dione, 5-chloro-1H-indole-2,3-dione, andα-amino acids (phenylalanine, isoleucine, and glycine). All compounds are characterized by elemental analyses, molar conductance measurements, and molecular weight determinations. Bonding of these complexes is discussed in terms of their UV-visible, infrared, and nuclear magnetic resonance (1H,13C, and119Sn NMR) spectral studies. The results suggest that Schiff bases behave as monobasic bidentate ligands and coordinate with dibutyltin(IV) in octahedral geometry according to the general formula [Bu2Sn(L)2]. Elemental analyses and NMR spectral data of the ligands with their dibutyltin(IV) complexes agree with their proposed distorted octahedral structures. Few representative compounds are tested for their in vitro antibacterial activity against Gram-positive (B. cereus,Staphylococcusspp.) and Gram-negative (E. coli,Klebsiellaspp.) bacteria. The results show that the dibutyltin complexes are more reactive with respect to their corresponding Schiff base ligands.

New Macrocyclic Complexes Derived From Cobalt(III) Cage Complexes

1994 ◽  
Vol 47 (3) ◽  
pp. 529 ◽  
Author(s):  
II Creaser ◽  
T Komorita ◽  
AM Sargeson ◽  
AC Willis ◽  
K Yamanari
Keyword(s):  
Aqueous Solution ◽  
Strain Energy ◽  
Macrocyclic Ligand ◽  
Zinc Powder ◽  
Crystallographic Analysis ◽  
X Ray ◽  
Alkyl Complexes ◽  
Nitrogen Donor ◽  
Asymmetric Nitrogen

The synthesis and partial characterization of several green complexes, derived from the products of the reactions between [Co(Cl2-sar)]3+ (Cl2-sar = 1,8-dichloro-3,6,10,13,16,19- hexaazabicyclo [6.6.6] icosane ) and zinc powder in water, are described. Most of the complexes appear to have [CoCl2(N4)] chromophores , where N4 denotes the tetraaza macrocyclic ligand , 6,13-dimethylene-1,4,8,11-tetraazacyclotetradecane (L1). For trans-[CoCl2(L1)]+, three isomers due to different configurations about the asymmetric nitrogen donor centres were obtained and characterized by the electronic absorption and 13C n.m.r. spectra. Their stereochemistry is discussed and compared with that of 1,4,8,11-tetraazacyclotetradecane on the basis of strain energy minimized calculations. A trans-[CoCl2(H2L2)]3+ complex containing a related macrocycle with a pendant ethane-1,2-diamine arm [H2L2+, 6-(4-ammonio-2-azoniabutyl)-13-methylene-1,4,8,11-tetraazacyclotetradecane] was also isolated and characterized by X-ray crystallographic analysis. All these molecules are derived from the decomposition of zinc alkyl complexes formed by oxidative addition of zinc to the parent [CoII(Cl2-sar)]2+ ion in aqueous solution.

scholarly journals Synthesis, Characterization of La(III), Nd(III), and Er(III) Complexes with Schiff Bases Derived from Benzopyran-4-one and Thier Fluorescence Study

2012 ◽  
Vol 2012 ◽  
pp. 1-13 ◽  
Author(s):  
Aida L. El-Ansary ◽  
Nora S. Abdel-Kader
Keyword(s):  
Schiff Bases ◽  
Molar Conductance ◽  
Spectral Studies ◽  
Water Molecules ◽  
Stoichiometric Ratio ◽  
Binuclear Complexes ◽  
Fluorescence Study ◽  
H Nmr ◽  
Coordinated Water

The Schiff bases, L1, L2, and L3, are synthesized from the condensation of 5,7-dihydroxy-6-formyl-2-methylbenzopyran-4-one (L) with 2-aminopyridine (1), p-phenylenediamine (2), and o-phenylenediamine (3). The prepared Schiff bases react with lanthanum (III), neodymium (III), and erbium (III) nitrate to give complexes with stoichiometric ratio (1 : 1) (ligand : metal). The binuclear complexes of Er(III) with L3 and the three metal ions with L2 are separated. The complexes have been characterized by elemental analysis, molar conductance, electronic absorption, and infrared, 1H-NMR spectral studies. The presence of hydrated and coordinated water molecules is inferred from thermogravimetric analysis. Thermal degradation studies show that the final product is the metal oxide. The luminescence properties of the Nd(III) and Er(III) complexes in dimethylformamide (DMF) solutions were investigated.

scholarly journals Synthesis and characterization of cis-dioxomolybdenum(VI) complexes having furil as precursor molecule

2012 ◽  
Vol 77 (9) ◽  
pp. 1205-1210
Author(s):  
Devendra Rao ◽  
Hardeo Yadav ◽  
Ashok Yadava ◽  
Sanjay Singh ◽  
Uma Yadav
Keyword(s):  
Oxygen Transfer ◽  
Chelating Agent ◽  
Molar Conductance ◽  
Octahedral Geometry ◽  
Transfer Reactions ◽  
Synthesis And Characterization ◽  
Precursor Molecule ◽  
Elemental Analyses ◽  
Tetraazamacrocyclic Ligands

Synthesis of some new dioxomolybdenum(VI) complexes having general formula [MoO2(mac)](acac)2, (where mac = tetraazamacrocyclic ligands derived from condensation of furil with 1,2-diaminobenzene or 2,3-diaminopyridine and their reaction with ?-diketones) using dioxometal ion as kinetic template are reported. The prepared complexes have been characterized by molar conductance, elemental analyses, infrared and electronic data. The spectral data indicate that ligands act as tetradentate chelating agent. Due to their biological relevance, molybdenum catalyzed oxygen transfer reactions have great interest. All the dioxomolybdenum(VI) complexes have octahedral geometry with six coordination.

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