Synthesis, Characterization and Thermal Study of Some Transition Metal Complexes Derived from Quinoxaline-2,3-Dione

2018 ◽  
pp. 209
Author(s):  
Taghreed M. Musa ◽  
Mahmoud Najim A.Al-jibouri ◽  
Bayader Fadhil Abbas
Keyword(s):  
Thermal Stability ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Dsc Analysis ◽  
Visible Spectra ◽  
Elemental Analyses ◽  
Ft Ir ◽  
Uv Visible ◽  
Thermal Stability Of

   The present paper describes the synthesis and structural studies of new transition metal complexes of cobalt(II), nickel(II), copper(II) and cadmium(II) with two bi dentate ligands derived from quinoxaline-2,3-dione. The two ligands were fully identified by elemental analyses, FT-IR, NMR and UV-Visible spectra. The metal complexes of  Co(II), Ni(II), Cu(II) and Cd(II) were isolated in the solid state after reactions of their metal chlorides with the ligands in 2:1 mole ratio. The isolated solid metal complexes were characterized with the help of elemental analyses, NMR, FT-IR and UV-Visible spectra. As well as the thermal stability of the coordinated quinoxaline polymers were tested by TG-DSC analysis and it is found that cleavage of terminal moiety was investigated, the strong coordinated bonds between oxygen donor atoms in L1 while nitrogen donor atoms of quinoxaline ring in the L2 with the metal ions. Furthermore, the thermal stability of cobalt(II), nickel(II), copper(II) and Cd(II) complexes were screened by TG-DSC analysis and the results helped us in the investigation of the proposed structure of the prepared complexes in the formula [M(L)2Cl2].XH2O and [Cd(L)2]Cl2 where L= L1 and L2  ligands derived from quinoxaline-2,3-dione.  

scholarly journals Preparation, Spectroscopic Characterization and Theoretical Studies of Transition Metal Complexes with 1-[(2-(1H-indol-3-yl)ethylimino)methyl]naphthalene-2-ol Ligand

2019 ◽  
Vol 31 (11) ◽  
pp. 2430-2438 ◽  
Author(s):  
Vian Yamin Jirjees ◽  
Veyan Taher Suleman ◽  
Abbas Ali Salih Al-Hamdani ◽  
Suzan Duraid Ahmed
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Spectroscopic Characterization ◽  
Bidentate Ligand ◽  
Spectroscopic Techniques ◽  
Theoretical Studies ◽  
Ft Ir ◽  
Uv Visible ◽  
Methyl Naphthalene

A new Schiff base [1-((2-(1H-indol-3-yl)ethylimino)methyl)naphthalene-2-ol] (HL) has been synthesized by condensing (2-hydroxy-1-naphthaldehyde) with (2-(1H-indol-3-yl)ethylamine). In turn, its transition metal complexes were prepared having the general formula; [Pt(IV)Cl2(L)2], [Re(V)Cl2(L)2]Cl and [Pd(L)2], 2K[M(II)Cl2(L)2] where M(II) = Co, Ni, Cu] are reported. Ligand as well as metal complexes are characterized by spectroscopic techniques such as FT-IR, UV-visible, 13C & 1H NMR, mass, elemental analysis. The results suggested that the ligand behaves like a bidentate ligand for all the synthesized complexes. On the other hand, theoretical studies of the ligand as well its metal complexes were conducted at gas phase using HyperChem 8.0. These metal complexes exhibited good antibacterial activity.

scholarly journals Antibacterial Activities of Transition Metal complexes of Mesocyclic Amidine 1,4-diazacycloheptane (DACH)

2019 ◽  
Vol 17 (1) ◽  
pp. 936-942
Author(s):  
Sadia Rehman ◽  
Muhammad Ikram ◽  
Fazle Subhan ◽  
Mutasem Sinnokrot ◽  
Waliullah Khan
Keyword(s):  
Antibacterial Activity ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Antibacterial Activities ◽  
Bacterial Strains ◽  
Magnetic Susceptibilities ◽  
Elemental Analyses ◽  
Ft Ir ◽  
Anionic Effect ◽  
Uv Visible

AbstractThe titled compound 1,4-diazacycloheptane have vibrational freedom which allows it to coordinate to metal through 1st and 4th positions. Copper (II) and Nickel (II) complexes of DACH were prepared and characterized through UV-Visible, FT-IR, elemental analyses, conductance, and magnetic susceptibilities and compared to the results published in Inorg. Chem., 8(3), 528 (1969). The prepared complexes bearing different coordinating or non-coordinating anions were screened against four different pathogenic bacterial strains to study anionic effect on antibacterial activity. The MIC values of all the compounds suggest that [Cu(DACH)2Br2] is almost inactive against the tested microbes except Staph aureus. Rest of the metal complexes are active at their respective MIC values.

Studies on complexes of VO(II), Mn(II), Cu(II), Ni(II), Co(II), Zn(II), Fe(III), and UO2(II) with hydrazone β-diketone ligands

1990 ◽  
Vol 68 (5) ◽  
pp. 774-781 ◽  
Author(s):  
Mohamed S. Abdel-Moez ◽  
Shaker L. Stefan ◽  
Mostafa M. El-Behairy ◽  
Mohamed M. Mashely ◽  
Basheir A. El-Shetary
Keyword(s):  
Magnetic Susceptibility ◽  
Transition Metal ◽  
Ir Spectra ◽  
Metal Ions ◽  
Metal Complexes ◽  
Stability Constants ◽  
Transition Metal Complexes ◽  
Elemental Analysis ◽  
Water Solvent ◽  
Uv Visible

The stepwise stability constants of VO(II), Mn(II), Cu(II), Ni (II), Co(II), Zn(II), Fe(III), and UO2(II) metal ions with 2-(2-acetylphenylhydrazone)-5,5-dimethyl-1,3-cyclohexane dione (2-APHDm), 3-(2-acetylphenylhydrazone)pentane-2,4-dione (2-APHA), 2-(2-acetylphenylhydrazone)-1-phenyl-1,3-butane dione (2-APHB), 2-(2-acetylphenylhydrazone)-1,3-diphenyl-1,3-propane dione (2-APHDB), and 3-(2-acetylphenylhydrazone)-1,1,1-trifluoropentane-2,4-dione (2-APHTA) were determined at 30 °C by pH titrations in 75% (v/v) dioxane–water solvent. In addition, metal complexes of three related β-diketones, 2-APHA, 2-APHB, and 2-APHDB have been synthesized and characterized by elemental analysis, uv–visible, ir spectra, and conductance in DMF and magnetic susceptibility measurements. The structure of the complexes have been proposed. Keywords: transition metal complexes of hydrazone-β-diketone ligands.

scholarly journals Transition metal complexes with a new tridentate ligand, 5-[6-(5-mercapto- 1,3,4-oxadiazol-2-yl)pyridin-2-yl]-1,3,4-oxadiazole-2-thiol

2007 ◽  
Vol 72 (4) ◽  
pp. 357-366 ◽  
Author(s):  
Kalagouda Gudasi ◽  
Manjula Patil ◽  
Ramesh Vadavi ◽  
Rashmi Shenoy ◽  
Siddappa Patil
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Thermal Studies ◽  
Tridentate Ligand ◽  
Spectral Studies ◽  
1H And 13C Nmr ◽  
Pyridine Nitrogen ◽  
Elemental Analyses ◽  
Thiol Form

A new ligand 5-[6-(5-mercapto-1,3,4-oxadiazol-2-yl)pyridin-2-yl]-1,3,4-oxadiazole- 2-thiol (L) and its Mn(II), Co(II), Ni(II), Cu(II), and Zn(II) complexes were synthesized. The authenticity of the ligand and its transition metal complexes were established by elemental analyses, conductance and magnetic susceptibility measurements, as well as spectroscopic (IR, 1H- and 13C-NMR, electronic, mass, ESR) and thermal studies. The IR and 1H-NMR spectral studies revealed the existence of the ligand in the thiol form in the solid state, whereas in the thione form in the dissolved state. The magnetic and electronic spectral studies suggest an octahedral geometry for all the complexes. The ligand acts as a tridentate ligand coordinating through the pyridine nitrogen and the nitrogen atoms (N-3' and N-3'') of the two oxadiazole rings. Antimicrobial screening of the ligand and its metal complexes were determined against the bacteria Escherichia coli and Bacillus cirroflagellosus, as well as against the fungi, Aspergillus niger and Candida albicans. .

Synthesis, structural characterization, and reactivity of late transition-metal complexes bearing linked cyclopentadienyl–carboranyl ligands

2012 ◽  
Vol 90 (1) ◽  
pp. 108-117 ◽  
Author(s):  
Dongmei Liu ◽  
Zaozao Qiu ◽  
Hoi-Shan Chan ◽  
Zuowei Xie
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Structural Characterization ◽  
Molecular Structures ◽  
Spectroscopic Techniques ◽  
Late Transition Metal ◽  
X Ray ◽  
Elemental Analyses ◽  
Late Transition

Late transition-metal complexes bearing linked cyclopentadienyl/indenyl–carboranyl ligands were synthesized and their reactivities were examined. Reaction of Li2[Me2C(L)(C2B10H10)] (L = C5H4, C9H6, Me2NCH2CH2C5H3) with MCl2(PPh3)2 in Et2O afforded [η5:σ-Me2C(C5H4)(C2B10H10)]M(PPh3) (M = Co (4), Ni (5)), [η5:σ-Me2C(C9H6)(C2B10H10)]M(PPh3) (M = Co (6), Ni (7)), and [η5:σ-Me2C(Me2NCH2CH2C5H3)(C2B10H10)]Ni(PPh3) (8). Treatment of 4 or 5 with 2,6-dimethylphenylisocyanide, N-heterocyclic carbene (NHC), PCy3, or 1,2-bis(diphenylphosphino)ethane (dppe) gave the corresponding PPh3 displacement complexes [η5:σ-Me2C(C5H4)(C2B10H10)]M(2,6-Me2C6H3NC) (M = Co (9), Ni (10)), [η5:σ-Me2C(C5H4)(C2B10H10)]M[1,3-(2,6-i-Pr2C6H3)2C3N2H2] (M = Co (11), Ni (12)), [η5:σ-Me2C(C5H4)(C2B10H10)]Ni(PCy3) (13), or {[η5:σ-Me2C(C5H4)(C2B10H10)]Co}2(dppe) (14), respectively. These complexes were characterized by various spectroscopic techniques and elemental analyses. The molecular structures of 4–14 were further confirmed by single-crystal X-ray analyses.

Synthesis, Characterization and DNA-Binding Studies of Transition Metal Complexes with Imidazole Ligands

2011 ◽  
Vol 233-235 ◽  
pp. 175-179 ◽  
Author(s):  
Jun Wang ◽  
Xiang Rong Liu ◽  
Yu Jin Sun ◽  
Kan She Li ◽  
Shun Sheng Zhao
Keyword(s):  
Dna Binding ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Elemental Analysis ◽  
Binding Studies ◽  
Binding Ability ◽  
Dna Binding Studies ◽  
Ft Ir ◽  
Imidazole Ligands

A series of novel complexes of transition metal (Co, Fe and Mn) with imidaloze have been synthesized and characterized by Elemental Analysis, FT-IR and UV-Vis Absorption spectroscopy. Based on elemental and spectral data, the complexes were found to be of Co(C3H4N2)4(ClO4)2(1), Fe(C3H4N2)3(ClO4)3(2) and Mn(C3H4N2)4(Ac)2(3) (C3H4N2= imidazole). The three complexes and the ligand (imidazole) display DNA binding ability, ascertained by UV-Vis titration.

Synthesis and infrared spectra of some transition metal complexes of α-amino acid esters

1967 ◽  
Vol 20 (4) ◽  
pp. 675 ◽  
Author(s):  
RW Hay ◽  
LJ Porter
Keyword(s):  
Amino Acid ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Infrared Spectra ◽  
Metal Ion ◽  
Amino Acid Esters ◽  
Visible Spectra ◽  
Metal Ratio ◽  
Acid Esters

A variety of transition metal complexes of a-amino acid esters have been synthesized, and characterized by analysis, conductivity measurements, and infrared spectra. The complexes can be broadly divided into two groups: (a) complexes in which only a metal-nitrogen bond occurs with the α-amino group of the ester, and (b) complexes in which chelate ring formation occurs via secondary donor groups on the ligand. These latter complexes are found with methyl L-histidinate, methyl γ-glutamate, and methyl L-cysteinate. With the exception of a methyl tryptophanate complex, the infrared spectra show that there is no interaction between the carbonyl group of the ester and the metal ion. The visible spectra of aqueous solutions of the esters and copper(II) at a ligand/metal ratio of 5 : 1 have maxima in the 600-650 mμ range at pH 7 consistent with copper-nitrogen bonding only.

Sign in / Sign up

Export Citation Format

Share Document