scholarly journals Synthesis, designing, characterization and anti-microbial studies of N, N'- Bis (2 hydroxyacetophenone) Ethylenediamine metal (II) complexes

2021 ◽  
Vol 9 (2) ◽  
pp. 057-064
Author(s):  
Nkeruwem Udo Nyah ◽  
Etiowo George Ukpong ◽  
Okon Effiong Okon ◽  
Ekemini Johnson Obosi
Keyword(s):  
Magnetic Measurements ◽  
Thermo Gravimetric Analysis ◽  
Bidentate Ligand ◽  
Alcoholic Solution ◽  
Mixed Ligand ◽  
Mixed Ligand Complexes ◽  
Molar Ratio ◽  
Gravimetric Analysis ◽  
Visible Spectra

Tetra dentate Schiff base N, N’-bis [2-hydroxyacetophenone] ethylendiamine (OAcPh-en) were formed by the 2:1 molar condensation of 2-hydroxyacetophenone with ethylenediamine. Their Ni(II), Cu(II), Co(II), Mn(II), Fe(II) and Zn(II) diaquo complexes (I) were synthesized. The neutral bidentate ligand derived from benzaldehyde and ethylenediamine or o-phenylenediamine in 1:1 molar ratio in alcoholic solution yield bis[benzylidene] ethylenediamine (Ben-en) or bis [benzylidene] o-phenylinediamine (Ben-opd) (II). Further reaction between (I) and (II) in alcohol yielded mixed ligand complexes. The characterization of these newly synthesized mixed-ligand complexes were done by elemental analysis, magnetic measurements, infrared spectra and uv-visible spectra, thermo gravimetric analysis, anti-microbial studies have also been under taken

Influence of F/P on Structure and Thermal Property of Phenolic Resin

2012 ◽  
Vol 500 ◽  
pp. 98-103 ◽  
Author(s):  
Zhi Qin Chen ◽  
Wei Jun Zeng ◽  
Yang Fei Chen ◽  
Wen Kui Li ◽  
Hong Bo Liu
Keyword(s):  
Thermal Properties ◽  
Thermal Property ◽  
Thermo Gravimetric Analysis ◽  
Crosslinking Density ◽  
Char Yield ◽  
Molar Ratio ◽  
Gravimetric Analysis ◽  
Thermo Gravimetric ◽  
Molar Ratios

The influence of F/P on structure and thermal property of resin was studied. Six resins were synthesized with different molar ratios of F/P. These resins were cured by means of temperature and without catalyst. The characterization of the resin was done by Fourier transform infrared spectroscopy (FTIR), thermo gravimetric analysis (TGA) and differential thermo gravimetric analysis (DTG). From the thermal properties of fully cured resins, characteristic properties including pyrolysis temperature and char yield were obtained. A maximum in the benzene ring substitutions, methylene bridge and the result of the thermal properties allow us to say that the resin with F/P molar ratio 1.2 has the highest crosslinking density and highest char yield, over 73%.

scholarly journals Synthesis and characterization of some biological active transition metal complexes of Schiff base derived from cefixime with mixed ligand 8-hydroxy quinoline

2015 ◽  
Vol 12 (4) ◽  
pp. 797-807
Author(s):  
Baghdad Science Journal
Keyword(s):  
Melting Point ◽  
Metal Ion ◽  
Bidentate Ligand ◽  
Mixed Ligand ◽  
Molar Ratio ◽  
Synthesis And Characterization ◽  
Vis Spectroscopy ◽  
Ft Ir ◽  
Hydroxy Quinoline

The aim of the work is synthesis and characterization of bidentate ligand [dipotassium sodium7-((E)-2-(2-((Z)-1-carboxylatoethylideneamino)thiazol-4-yl)-2 (carboxylatemethoxyimino) acet amido)-8-oxo-3-vinyl-5- thia-1-azabicyclo[4.2.0] oct-2- ene-2- carboxylate] [Nak2L], from the reaction of cefixime with sodium pyruvet to produce the ligand [Nak2L], the reaction was carried out in methanol as a solvent under reflux. The prepared ligand [Nak2L] which was characterized by FT-IR, UV-Vis spectroscopy, 1H, 13C-NMR spectra, Mass spectra, (C.H.N) and melting point. The mixed ligand complexes were prepared from ligand [Nak2L] was used as a primary ligand while 8-hydroxy quinoline [Q] was used as a secondary ligand with metal ion M(?).Where M(?) = (Mn ,Co ,Ni ,Cu ,Zn and Cd) at reflux ,using methanol as a solvent, KOH as a base. Complexes of the composition [(M)2(Q)2(KL)(H2O)4] with (2:2:1) molar ratio were prepared. All the complexes were characterized by spectroscopic methods (FT-IR, UV-Vis spectroscopy) along with elemental analysis (A.A), chloride content and melting point measurements were carried out, together with conductivity and magnetic susceptibility. These measurements showed octahedral geometry around (Mn??, Co??, Ni??, Cu??, Zn?? and Cd??) ions. The biological activity of the ligands [NaK2L], [Q] and complexes [(M)2(Q)2(KL)(H2O)4] were studied by using inhibition method.

scholarly journals Synthesis, structural elucidation and electrochemical behavior of some oxime-phenylalanine mixed ligand complexes

2021 ◽  
Vol 34 (3) ◽  
pp. 543-556
Author(s):  
U. T. Öztoprak ◽  
S. P. Özkorucuklu ◽  
G. Y. Baştemur ◽  
M. E. Tunçmen ◽  
F. Karipcin
Keyword(s):  
Cyclic Voltammetry ◽  
Supporting Electrolyte ◽  
Carbonyl Oxygen ◽  
Molar Conductance ◽  
Mixed Ligand ◽  
Mixed Ligand Complexes ◽  
Molar Ratio ◽  
Gravimetric Analysis ◽  
Geometrical Structures ◽  
Elemental Analyses

Four new mixed ligand complexes Me(II)/phenylalanine (phe)/HL [HL =4-(4-bromophenyl- aminoisonitrosoacetyl)biphenyl and Me = Co, Ni, Cu, Zn] were synthesized. These complexes are formulated as: [CoL(phe)(H2O)2], [NiL(phe)(H2O)2], [CuL(phe)(H2O)2] and [ZnL(phe)(H2O)2]. All the compounds were characterized by elemental analyses, FT-IR, magnetic susceptibility measurements, TG/DTA and cyclic voltammetry (CV) experiments. IR spectral data confirmed the coordination of the oxime ligand to the metal ions through the oxime and carbonyl oxygen. The geometrical structures of the complexes have been found to be octahedral. The measured molar conductance values of the complexes in DMF are in agreement with the non-electrolytic nature ofthe complexes. The elemental analyses confirm a 1:1:1 [metal:HL:L(phenylalanine)] molar ratio. Thermal behavior of the compound was investigated by thermal gravimetric analysis (TG) and differential thermal analysis (DTA) techniques. All the complexes were transformed into metal oxides after thermal degradation. The electrochemical properties of both ligand and their complexes were analyzed by cyclic voltammetry (CV) using glassy carbon electrode in DMF solution containing 0.1 M TBAP as supporting electrolyte.                     KEY WORDS: Oxime, electrochemical characterization, mixed ligand complexes, amino acid, phenylalanine   Bull. Chem. Soc. Ethiop. 2020, 34(3), 543-556. DOI: https://dx.doi.org/10.4314/bcse.v34i3.10

scholarly journals Synthesis and Characterization of Mixed Ligand Complexes of Co(II) and Fe(III) Ions with Malic Acid and Heterocyclic Amines

2012 ◽  
Vol 15 (2) ◽  
pp. 177-181
Author(s):  
Md Belayet Hossain ◽  
MA Yousuf ◽  
M Rafiqul Islam ◽  
Md Abdus Salam ◽  
Mohammad Arifur Rahman ◽  
...  
Keyword(s):  
Malic Acid ◽  
Metal Ion ◽  
Pathogenic Bacteria ◽  
Magnetic Measurements ◽  
Pharmaceutical Journal ◽  
Spectroscopic Studies ◽  
Mixed Ligand ◽  
Heterocyclic Amines ◽  
Mixed Ligand Complexes

This paper describes the preparation and characterization of mixed ligand complexes of Co(II) and Fe(III) ions with malic acid and heterocyclic amines. The general formula of the complexes are as follows: [M(MA)L2] and K[M(MA)2L2] (where, M = Co(II) (1-4), Fe(II) (5-8); MA = C4H4O5 (1-4), 2C4H4O5 (5-8); L = C6H5N (1), C6H7N (2), C9H7N (3, 4), 2C6H5N (5), 2C6H7N (6), 2C9H7N (7-8). The complexes were prepared in the solid form and characterized by elemental analysis, conductivity and magnetic measurements, infrared and electronic spectroscopic studies. The infrared spectra of the complexes confirmed the coordination of metal ion with ligands. The Co(II) complexes are assumed to have tetrahedral and the Fe(III) complexes have octahedral structure based on the electronic spectra and magnetic measurements. Their antibacterial and antifungal activity has also been evaluated by the disc diffusion methods against fourteen pathogenic bacteria (five gram positive and nine gram negative) and fourteen fungi. Complexes [Co(II)(MA)(4-pico)2] showed the highest antibacterial activity against all bacteria tested (when, MA= C4H4O5 and 4-pico = C6H7N). DOI: http://dx.doi.org/10.3329/bpj.v15i2.12589 Bangladesh Pharmaceutical Journal 15(2): 177-181, 2012

Coordination Compounds of Some 3d-Transition Metal Ions with N1-[4-(4-bromo-phenylsulfonyl)-benzoyl]-N4-(4-methoxyphenyl)- thiosemicarbazide

2008 ◽  
Vol 59 (7) ◽  
Author(s):  
Madalina Angelusiu ◽  
Maria Negoiu ◽  
Stefania-Felicia Barbuceanu ◽  
Tudor Rosu
Keyword(s):  
Coordination Compounds ◽  
Magnetic Moments ◽  
Thermo Gravimetric Analysis ◽  
Electronic Spectroscopy ◽  
Transition Metal Ions ◽  
Synthesis And Characterization ◽  
Gravimetric Analysis ◽  
Thermo Gravimetric ◽  
New Compounds

The paper presents the synthesis and characterization of Cu(II), Co(II), Ni(II), Cd(II), Zn(II) and Hg(II) complexes with N1-[4-(4-bromo-phenylsulfonyl)-benzoyl]-N4-(4-methoxyphenyl)-thiosemicarbazide. The new compounds were characterized by IR, EPR, electronic spectroscopy, magnetic moments, thermo-gravimetric analysis and elemental analysis.

Interaction of ditertiary phosphines with phenyl- and 1-naphthyldithiocarbamatonickel(II)

1985 ◽  
Vol 50 (6) ◽  
pp. 1383-1390
Author(s):  
Aref A. M. Aly ◽  
Ahmed A. Mohamed ◽  
Mahmoud A. Mousa ◽  
Mohamed El-Shabasy
Keyword(s):  
Thermal Analysis ◽  
Powder Diffraction ◽  
Spin Structure ◽  
Magnetic Measurements ◽  
Mixed Ligand ◽  
Mixed Ligand Complexes ◽  
X Ray ◽  
Square Planar

The synthesis of the following mixed ligand complexes is reported: [Ni(phdtc)2(dpm)2], [Ni(phdtc)2(dpe)2], [Ni(phdtc)2(dpp)3], [Ni(1-naphdtc)2(dpm)2], [Ni(1-naphdtc)2], and [Ni(1-naphdtc)2(dpp)2], where phdtc = PhNHCSS-, 1-naphdtc = 1-NaPhNHCSS-, dpm = Ph2PCH2PPh2, dpe = Ph2P(CH2)2PPh2, and dpp = Ph2P(CH2)3PPh2. The complexes are characterised by microanalysis, IR and UV-Vis spectra, magnetic measurements, conductivity, X-ray powder diffraction, and thermal analysis. All the mixed ligand complexes are diamagnetic, and thus a square-planar or square-pyramidal (low-spin) structure was proposed for the present complexes.

scholarly journals Rapid four-component synthesis of dihydropyrano[2,3-c]pyrazoles using nano-eggshell/Ti(IV) as a highly compatible natural based catalyst

BMC Chemistry ◽  
2021 ◽  
Vol 15 (1) ◽  
Author(s):  
Arefeh Dehghani Tafti ◽  
Bi Bi Fatemeh Mirjalili ◽  
Abdolhamid Bamoniri ◽  
Naeimeh Salehi
Keyword(s):  
Thermo Gravimetric Analysis ◽  
Reaction Times ◽  
Diffraction Field ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Solvent Free Conditions ◽  
High Yields ◽  
Work Up

AbstractNano-eggshell/Ti(IV) as a novel naturally based catalyst was prepared, characterized and applied for the synthesis of dihydropyrano[2,3-c]pyrazole derivatives. The characterization of nano-eggshell/Ti(IV) was performed using Fourier Transform Infrared spectroscopy, X-ray Diffraction, Field Emission Scanning Electron Microscopy, Energy-Dispersive X-ray Spectroscopy, and Thermo Gravimetric Analysis. Dihydropyrano[2,3-c]pyrazoles were synthesized in the presence of nano-eggshell/Ti(IV) via a four component reaction of aldehydes, ethyl acetoacetate, malononitrile and hydrazine hydrate at room temperature under solvent free conditions. The principal affairs of this procedure are mild condition, short reaction times, easy work-up, high yields, reusability of the catalyst and the absence of toxic organic solvents.

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