scholarly journals New mixed-ligand Ni(II) and Zn(II) macrocyclic complexes with bridged (endo,endo)-bicyclo [2.2.1]hept-5-ene-2,3-dicarboxylate: Synthesis, characterization, antimicrobial and cytotoxic activity

2019 ◽  
Vol 84 (9) ◽  
pp. 961-973 ◽  
Author(s):  
Mirjana Antonijevic-Nikolic ◽  
Branka Drazic ◽  
Jelena Antic-Stankovic ◽  
Sladjana Tanaskovic
Keyword(s):  
Macrocyclic Ligand ◽  
Analytical Data ◽  
Mixed Ligand ◽  
Myelogenous Leukemia ◽  
Boat Conformation ◽  
Gram Positive Bacteria ◽  
Vis Spectroscopy ◽  
Bacillus Subtilis Atcc ◽  
Leukemia K562 Cell ◽  
Human Cervix

New carboxylate complexes of the tetraazamacrocyclic ligand N,N',N'',N'''-tetrakis(2-pyridilmethyl)-1,4,8,11-tetraazacyclotetradecane (tpmc) with Ni(II) and Zn(II) as central ions were prepared. In mixed-ligand complexes (endo,endo)-bicyclo?2.2.1?hept-5-ene-2,3-dicarboxylate dianion (C9H8O4 2-) is also coordinated to metal ions. The complexes were characterized by elemental analysis (C, H, N), FTIR and UV?Vis spectroscopy, molar conductivity determination and magnetic susceptibility measurement at room temperature. The analytical data of the complexes show the formation of binuclear [Ni2(C9H8O4)tpmc](ClO4)2?4H2O and tetranuclear [Zn4(C9H8O4)(tpmc)2](ClO4)6? ?CH3CN?KClO4?4H2O complexes. In tetranuclear Zn(II) complex bicyclic dicarboxylate ligand is most likely to be bridge coordinated, and in binuclear Ni(II) complex it is coordinated in a combined bridged manner with chelate rings formation. In both complexes macrocyclic ligand was exo coordinated, out of cyclam ring and adopts a boat conformation. The Zn(II) complex is one of the rare tetranuclear Zn(II)-tpmc complexes with carboxylate ion bridging two Zn2tpmc units. The complexes were tested for antibacterial activity against Gram-positive bacteria Staphylococcus aureus (ATCC 25923) and Bacillus subtilis (ATCC 6633), Gram-negative bacterium Escherichia coli (ATCC 25922), and yeast Candida albicans (ATCC 10231), and were screened for antiproliferative activity against human cervix adenocarcinoma (HeLa) and human myelogenous leukemia (K562) cell lines.

scholarly journals Synthesis and characterization of copper (II) octaazamacrocyclic complexes with glycine derivatives. In vitro antiproliferative and antimicrobial evaluation of Cu(II) and Co(II) analogous

2020 ◽  
Vol 85 (5) ◽  
pp. 637-649
Author(s):  
Branka Drazic ◽  
Mirjana Antonijevic-Nikolic ◽  
Zeljko Zizak ◽  
Sladjana Tanaskovic
Keyword(s):  
Cell Line ◽  
Magnetic Measurements ◽  
Macrocyclic Ligand ◽  
Chemical Properties ◽  
Cancer Cell Line ◽  
Myelogenous Leukemia ◽  
Boat Conformation ◽  
Human Embryonic Lung ◽  
Cell Line Hela

Two new complexes with the general formula [Cu2(L)tpmc] (ClO4)3?nH2O (tpmc = N,N?,N??,N???-tetrakis(2-pyridylmethyl)- -1,4,8,11-tetraazacyclotetradecane, L = N-methylglycine, n = 3; L = N,N- -dimethylglycine, n = 2) were isolated and their composition, some physical and chemical properties and geometries were proposed based on elemental analysis (C, H, N), conductometric and magnetic measurements and spectroscopic data (UV?Vis, FTIR). It is evident that the complexes are binuclear and an exo coordination mode of the macrocyclic ligand in the boat conformation was proposed. The co-ligands are coordinated as a bridge using both oxygen atoms of the OCO- group. The cytotoxic activity of Cu(II) complexes as well as their Co(II) analogs, the starting ligands and the free salts were tested against human cervix adenocarcinoma cell line (HeLa), human chronic myelogenous leukemia cells (K562), human breast cancer cell line (MDA-MB-453), and a non-cancerous cell line, human embryonic lung fibroblast (MRC-5). The IC50 values for the Cu(II) complexes were from 21.6?0.04 to 66.1?0.8, and for the Co(II) analogs were within the range from 8.8?0.74 to 15.40?1.52. All four complexes were tested for their antimicrobial activity against Staphylococcus aureus, Bacillus subtilis, Escherichia coli and the yeast Candida albicans.

scholarly journals A study of novel cobalt(II) octaazamacrocyclic complexes with aminocarboxylates or their derivatives

2009 ◽  
Vol 74 (6) ◽  
pp. 629-640 ◽  
Author(s):  
Gordana Vuckovic ◽  
Sladjana Tanaskovic ◽  
Mirjana Antonijevic-Nikolic ◽  
Vukosava Zivkovic-Radovanovic ◽  
Gordana Gojgic-Cvijovic
Keyword(s):  
Magnetic Measurements ◽  
Macrocyclic Ligand ◽  
Chemical Properties ◽  
High Spin State ◽  
Mixed Ligand ◽  
Potential Range ◽  
Boat Conformation ◽  
Physical And Chemical Properties ◽  
Physical And Chemical ◽  
And Chemical Properties

Four new air-stable mixed-ligand Co(II) complexes having the general formula [Co2(Y)tpmc]Z3?q(H2O/CH3CN) (HY = N-methylglycine/N,N-dimethylglycine, Z = - 4BF , qH2O=4 or 3; HY=S-norvaline/S-valine Z=-ClO4 , qCH3CN = 0.5; qH2O = 0.5; tpmc = N,N',N'',N'''-tetrakis(2-pyridylmethyl)- -1,4,8,11-tetraazacyclotetradecane) were prepared. The composition, some physical and chemical properties and their tentative geometries were evaluated based on elemental analysis (C, H, N), conductometric and magnetic measurements, spectroscopic data (UV/Vis, IR) and cyclic voltammetry. The data were compared with earlier described analogous complexes containing the macrocyclic ligand and aliphatic aminocarboxylates. It is assumed that all complexes are binuclear with an exo coordination mode of the octaazamacrocyclic pendant ligand in the boat conformation. In addition, two -N-(CH2)2-N- portions of the cyclam ring within the tpmc ligand and Co(II) ions in the high-spin state are most probably bridged via oxygen atoms from the anion of the aminocarboxylate/derivatives, whereas nitrogen atoms rest uncoordinated. In all cases, a combined chelate-bridged coordination is proposed as the most probable. The complexes were electrochemically stable in the potential range -1.0 to 1.0 V. They were also preliminary assayed toward some microorganisms together with the ligands, starting simple salts and solvents as test substances. In some cases, certain antimicrobial activity of the complexes was detected.

Synthesis, Spectral and Antimicrobial Investigation of 2-(Naphthalenel-ylamino)-2- Phenylacetonitrile and 1, 10-Phenanthroline with Five Divalent Transition Metal Ions

2019 ◽  
Vol 10 (01) ◽  
Author(s):  
Mohammed Al-Amery1 ◽  
Ashraf Saad Rasheed ◽  
Dina A. Najeeb
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Transition Metal Ions ◽  
Molar Conductance ◽  
Octahedral Geometry ◽  
Mixed Ligand ◽  
Gram Negative Bacteria ◽  
Magnetic Studies ◽  
Gram Positive Bacteria

Five new mixed ligand metal complexes have been synthesized by the reaction of divalent transition metal ions (Hg, Ni, Zn, Cu and Cd) with 2-(naphthalen-l-ylamino)-2-phenylacetonitrile (L1 ) and 1,10-phenanthroline (L2). The coordination likelihood of the two ligands toward metal ions has been suggested in the light of elemental analysis, UV-Vis spectra, FTIR, 1H-NMR, flam atomic absorption, molar conductance and magnetic studies. Results data suggest that the octahedral geometry for all the prepared complexes. Antibacterial examination of synthesized complexes in vitro was performed against four bacterias. Firstly, Gram-negative bacteria namely, Pseudomonas aerugin and Escherichia. Secondly, Gram-positive bacteria namely, Bacillus subtilis, Staphylococcuaurouss. Results data exhibit that the synthesized complexes exhibited more biological activity than tetracycline pharmaceutical.

scholarly journals Green Synthesis of Iron Nanoparticles by Acacia nilotica Pods Extract and Its Catalytic, Adsorption, and Antibacterial Activities

2018 ◽  
Vol 8 (10) ◽  
pp. 1922 ◽  
Author(s):  
Enshirah Da’na ◽  
Amel Taha ◽  
Eman Afkar
Keyword(s):  
Electron Microscopy ◽  
Iron Nanoparticles ◽  
Antibacterial Activities ◽  
Acacia Nilotica ◽  
Opportunistic Pathogens ◽  
X Ray Diffraction ◽  
Gram Positive Bacteria ◽  
Vis Spectroscopy ◽  
Adsorption Processes ◽  
Oxidation Degradation

Iron nanoparticles (FeNP) were synthesized using Acacia nilotica seedless pods extract. The synthesized FeNP were characterized by Fourier transform infrared (FTIR), UV/Vis spectroscopy, dynamic light scattering (DLS), electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD). The XRD pattern confirmed the synthesis of crystalline phase of α-Fe2O3. EDS spectroscopy showed the presence of elemental iron and oxygen, indicating that the nanoparticles are essentially present in oxide form. UV absorption in the range of 450–550 nm confirmed the formation of FeNP. DLS indicated an average FeNP particle size of 229 nm. The synthesized FeNP was tested for adsorption and oxidation degradation of methyl orange (MO) under different conditions and found to be effective in both degradation and adsorption processes. Furthermore, the synthesized FeNP has the potential to terminate the pathogenicity of several human opportunistic pathogens; belongs to gram-negative and gram-positive bacteria and one species of Candida as well.

scholarly journals Chemical Composition and Antimicrobial Activity of Anthriscus nemorosa Root Essential Oil

2011 ◽  
Vol 6 (2) ◽  
pp. 1934578X1100600
Author(s):  
Milica Pavlović ◽  
Silvana Petrović ◽  
Marina Milenković ◽  
Maria Couladis ◽  
Olga Tzakou ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Essential Oil ◽  
Gram Positive Bacteria ◽  
Microdilution Method ◽  
Broth Microdilution Method ◽  
Bacillus Subtilis Atcc ◽  
Germacrene D ◽  
Main Components ◽  
Total Oil ◽  
Root Essential Oil

The essential oil obtained by hydrodistillation from the roots of Anthriscus nemorosa (Bieb.) Sprengel (Umbelliferae) was analyzed by GC and GC-MS. Among sixty-two compounds identified (representing 89.0% of the total oil), the main components were: n-nonane (12.1%), n-hexadecanol (6.9%), δ-cadinene (6.4%), β-pinene (6.0%) and germacrene D (5.4%). Furthermore, the antimicrobial activity of the oil was evaluated against the Gram-positive bacteria Staphylococcus epidermidis (ATCC 12228) and Bacillus subtilis (ATCC 6633), the Gramnegative bacterium Escherichia coli (ATCC 25922), and a yeast Candida albicans (ATCC 10259 and ATCC 24433) using the broth microdilution method.

scholarly journals High-spin binuclear Co(II) complexes with a pendant octaazamaclocycle and carboxylates

2007 ◽  
Vol 72 (12) ◽  
pp. 1295-1308 ◽  
Author(s):  
G. Vuckovic ◽  
S.B. Tanaskovic ◽  
Z.M. Miodragovic ◽  
V. Stanic
Keyword(s):  
Antibacterial Activity ◽  
Terephthalic Acid ◽  
Chair Conformation ◽  
Molar Conductivity ◽  
Mixed Ligand ◽  
Boat Conformation ◽  
Trans Position ◽  
Oxidation Of Co ◽  
Elemental Analyses ◽  
Cv Measurements

Three new binuclear Co(II) mixed-ligand complexes with N,N?,N??,N???-tetrakis( 2-pyridylmethyl)-1,4,8,11-tetraazacyclotetradecane (tpmc) and mono- or dicarboxylate ligands were prepared and some of their physical properties were determined. The general formulas: [Co2(HCOO)2tpmc](ClO4)2?4H2O, [Co2(CH3COO)2tpmc](ClO4)2 and [Co2(tpht)tpmc](ClO4)2?4H2O (tphtH2 = terephthalic acid) were proposed on the basis of elemental analyses (C,H,N) and molar conductivity. UV/Vis absorption and IR spectra, magnetic and CV measurements were used to study their geometries and properties. For the monocarboxylate complexes, an exo coordination of Co(II) with four nitrogens from tpmc and bis-bidentate bonded HCOO-/CH3COO- in the trans position is assumed. Tpmc adopts the chair conformation. For the dicarboxylate complex, it is supposed that a terephthalate dianion, as well as methylene chains from cyclam bridge two Co(II) atoms, while tpmc is in the boat conformation. The complexes were stable against chemical and electrochemical oxidation of Co(II) to Co(III). The data are compared with those for the previously published Cu(II) complexes containing the corresponding ligands and mutual similarities or differences were considered. Finally, some antibacterial activity of the complexes was found.

scholarly journals Biosynthesis and characterization of silver nanoparticles using ginger spent and their antibacterial activity

2021 ◽  
pp. 174-179
Author(s):  
Sinthia Ganesan ◽  
Palanichamy Mehalingam ◽  
Govindan Sadasivam Selvam
Keyword(s):  
Silver Nanoparticles ◽  
Waste Product ◽  
Colour Change ◽  
Zingiber Officinale ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
Diffusion Method ◽  
Klebsiella Pneumonia ◽  
Gram Positive Bacteria ◽  
Vis Spectroscopy

Ginger spent is the byproduct of spice industries that remove the essential oils of ginger (Zingiber officinale) for food industry and medicinal purposes. Ginger is a well known spice used often for seasoning in Indian cuisine. The de-oiled ginger has no specific use mostly goes to waste. Hence, we utilized this industrial waste product in the efficient synthesis of silver nanoparticles with the aid of UV irradiation from a solution of 1mM silver nitrate and spent extract in the ratio 9:1. Immediate colour change from pale yellow to dark brown was noted indicating the rapid synthesis of silver nanoparticles. These nanoparticles were centrifuged, dried and well characterized. UV Vis Spectroscopy, XRD analysis, Zeta potential and SEM analysis was carried out. It was commendable that the size of the nanoparticles fell well within the upper limit of 100nm. Agar well diffusion method was used to screen the antimicrobial activity of the well characterized silver nanoparticles. They were tested against seven pathogenic strains of three gram negative bacteria (Escherichia coli, Klebsiella pneumonia and Pseudomonas aeruginosa) three gram positive bacteria(Bacillus subtilis, Staphylococcus aureus and Streptococcus faecalis) and a fungus (Candida  albicans). It was seen that the zone of inhibition(ZOI) in well plate method  increased on increasing the concentration of silver nanoparticles. Further studies could lead to the application of these silver nanoparticles in medicine.

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