scholarly journals Synthesis, characterization and thermogravimetric study of Cu(II) adducts with 3- and 4-amino-1,2,4-triazole, 2-mercaptothiazoline and 2-mercaptopyridine

2006 ◽  
Vol 71 (12) ◽  
pp. 1289-1300 ◽  
Author(s):  
Moamen Refat ◽  
Farias de
Keyword(s):  
Infrared Spectroscopy ◽  
Solid State ◽  
Elemental Analysis ◽  
Covalent Character ◽  
Thermogravimetric Study ◽  
Bridging Ligand ◽  
Solid State Route ◽  
Ability To Act ◽  
Metal Ligand ◽  
Ligand Bond

The adducts CuCl2?(3amt), CuCl2?2(3amt)?2H2O, CuCl2?3(3amt), CuCl2?(4amt), CuCl2?2(4amt), CuCl2?3(4amt)?2H2O, CuCl2?(2mct)?H2O, CuCl2?2(2mct)?2.5H2O, CuCl2?3(2mct)?2H2O, CuCl2?(2mcp) and CuCl2?2(2mcp)?H2O, where 3-amino-1,2,4-triazole = 3amt, 4-amino-1,2,4-triazole = 4amt, 2-mercaptothiazoline = 2mct and 2-mercaptopyridine = 2mcp, were synthesized by a solid state route and characterized by CHN elemental analysis and infrared spectroscopy. A thermogravimetric study was also performed. It was verified that 4amp is a molecule with a higher ability to act as a bridging ligand in comparison with 3amp. It was also found that, for all compounds, the mono adducts were the most thermally stable ones. Such a fact is in agreement with a higher ionic and covalent character of the metal-ligand bond in surch compounds. .

scholarly journals Preparation and Thermogravimetric and Antimicrobial Investigation of Cd (II) and Sn (II) Adducts of Mercaptopyridine, Amino Triazole Derivatives, and Mercaptothiazoline Organic Ligand Moieties

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Ahmed Gaber ◽  
Walaa F. Alsanie ◽  
Robson F. de Farias ◽  
Moamen S. Refat
Keyword(s):  
Infrared Spectroscopy ◽  
Solid State ◽  
Organic Ligand ◽  
Antimicrobial Activities ◽  
Metal Chloride ◽  
Cross Linking ◽  
Water Molecules ◽  
Solid State Route ◽  
Coordination Sites ◽  
Mass Loss Step

The solid adducts of SnCl2.(3amt).H2O, SnCl2.2(3amt).H2O, CdCl2.(3amt), CdCl2.2(3amt), SnCl2.(2mct).0.5H2O, SnCl2.2(2mct), CdCl2.(2mct), CdCl2.2(2mct).H2O, SnCl2.(2mcp).1.5H2O, >2.2(2mcp).4H2O, CdCl2.(2mcp), CdCl2.2(2mcp), SnCl2.(4amt).4H2O, SnCl2.2(4amt).1.5H2O, CdCl2.(4amt).H2O, and CdCl2.2(4amt) (where the 3amt, 4amt, 2mct, and 2mcp represent 3-amino-1,2,4-triazole, 4-amino-1,2,4-triazole, 2-mercaptothiazoline, and 2-mercaptopyridine simple organic chelates, respectively) were prepared using a solid-state route and investigated by CHN elemental analysis and infrared spectroscopy. Additionally, we investigated the thermogravimetric characterization and antimicrobial proprieties. It is verified that for 3amt and 4amt adducts, the coordination occurs through nitrogen atom. For 2mct compounds, the coordination occurs through nitrogen (Sn) or sulfur (Cd). For 2mcp adducts, both coordination sites nitrogen and sulfur are involved. By examination of TG curves, it is confirmed that for each hydrated compounds, the first mass loss step is linked with the release of water molecules followed by the release of ligand molecules and sublimation of the metal chloride. Furthermore, it is verified that, considering only the release of ligand molecules (3amp, 4amp, 2mct, or 2mcp), the cadmium adducts are always more stable than the correspondent tin adducts probably due to the formation of cross-linking bonds in these compounds. Finally, of these 16 adducts, 14 showed antimicrobial activities against different bacterial and fungal strains.

The influence of water on the spectroscopic properties of a liposoluble magnesium porphyrin

1988 ◽  
Vol 66 (2) ◽  
pp. 273-278 ◽  
Author(s):  
Camille Chapados ◽  
Denis Girard ◽  
Michel Ringuet
Keyword(s):  
Infrared Spectroscopy ◽  
Solid State ◽  
Elemental Analysis ◽  
Spectroscopic Properties ◽  
Infrared Region ◽  
Water Molecules ◽  
Magnesium Atom ◽  
Coordinate Bond ◽  
Influence Of Water

Complexation of water by chlorophyll molecules in natural photosynthetic processes is a matter of great interest. In the present work the influence of water on a model porphyrin, magnesium 2,7,12,17-tetrahexyl-3,8,13,18-tetramethyl porphin (MgTHTMP) has been studied by infrared spectroscopy. A CCl4 (spectroscopic grade) solution of MgTHTMP showed two small bands in the 3600 cm−1 infrared region. These bands are assigned to ν3 and ν1 vibrations of water coordinated to the Mg atom. For MgTHTMP in the solid state, either deposited on an infrared plate or suspended in a Nujol film, none of the OH bands is observed. An elemental analysis confirmed that the solid porphyrin was anhydrous. This evidence indicates that while no water is complexed with MgTHTMP in the solid state, this porphyrin is highly hygroscopic in a CCl4 solution and will easily complex with the few water molecules (less than 0.01%) present in the spectro grade solvent by forming a coordinate bond between the central magnesium atom and the oxygen of water. Several other metallic porphyrins in CCl4 solutions have been studied for comparison with the Mg porphyrin. The spectra of these substances did not show any complexed water. A model of the H2O–MgTHTMP interaction is given and the implication of this model on the aggregation states of chlorophyll will be discussed.

scholarly journals Triphenylphosphine complexes of cadmium(II) perchlorate, nitrate, and trifluoroacetate preparation, characterization, and spectral studies

1981 ◽  
Vol 59 (23) ◽  
pp. 3267-3272 ◽  
Author(s):  
Ram G. Goel ◽  
Narendra K. Jha
Keyword(s):  
Solid State ◽  
Elemental Analysis ◽  
Vibrational Spectra ◽  
Nmr Spectra ◽  
Ionic Species ◽  
Spectral Studies ◽  
Spectral Measurements ◽  
Coordinate Structure ◽  
H Nmr ◽  
Metal Ligand

1:2 complexes, CdX2(PPh3)2, where X = ClO4, NO3, CF3CO2 and 1:1 complex, Cd(CF3CO2)2PPh3, have been isolated and characterized by elemental analysis and by vibrational and 31P—{lH} nmr spectral measurements. Conductance measurements show that the complexes behave as non-ionic species in dichloromethane. The vibrational spectra of the perchlorato complex are consistent with a six-coordinate structure in the solid state as well as in solution but it is difficult to deduce the structures of the nitrato and trifluoroacetato complexes from the spectral data. Assignments for the metal–ligand stretching frequencies for all the four complexes have been proposed. The 3lP—{1H} nmr spectra of the four complexes have been discussed. Formation of the 1:3 and 1:4 complexes, Cd(ClO4)2(PPh3)3 and Cd(ClO4)2(PPh3)4, in solution, has also been established by 31P—{lH} nmr spectral measurements.

scholarly journals Synthesis, characterization and thermal behaviour of solid state compounds of 4-methoxybenzoate with Manganese, Nickel and Copper

2005 ◽  
Vol 30 (1) ◽  
pp. 15-20 ◽  
Author(s):  
E. C. Rodrigues ◽  
A. C. Vallejo ◽  
E.Y. Ionashiro ◽  
G. Bannach ◽  
M. Ionashiro
Keyword(s):  
Thermal Stability ◽  
Thermal Analysis ◽  
Thermal Decomposition ◽  
Differential Thermal Analysis ◽  
Infrared Spectroscopy ◽  
Solid State ◽  
Thermal Behaviour ◽  
Elemental Analysis ◽  
X Ray

Solid state M-L compounds, where M stands for bivalent Mn, Ni, Cu and L is 4-methoxybenzoate, have been synthesized. Simultaneous thermogravimetry - differential thermal analysis (TG-DTA), X-ray powder diffractometry, infrared spectroscopy, elemental analysis and complexometry were used to characterize and to study the thermal behaviour of these compounds. The results led to information about the composition, dehydration, thermal stability and thermal decomposition of the isolated compounds.

Thermodynamics of metal-ligand bond formation. XX. Reaction of tertiary phosphines with mercury(II) halides

1976 ◽  
Vol 29 (4) ◽  
pp. 759 ◽  
Author(s):  
MJ Gallagher ◽  
DP Graddon ◽  
AR Sheikh
Keyword(s):  
Linear Relationship ◽  
Benzene Solution ◽  
Bond Formation ◽  
Enthalpies Of Formation ◽  
Bridging Ligand ◽  
Tertiary Phosphines ◽  
Inductive Effects ◽  
Metal Ligand ◽  
Enthalpy Data ◽  
Ligand Bond

Tertiary phosphines form highly stable 1 : 1 and 2 : 1 adducts with mercury(11) halides in benzene solution. In the series of phosphines (alkyl),PPh3-n enthalpies of formation are determined by inductive effects and give a linear relationship with Taft constants, ∑σ*. The cyclic phosphine 1,2,5-triphenylphosphole is a much weaker base towards the mercury(11) halides. While ethane-1,2- diylbis(dipheny1phosphine) behaves only as a chelate, methylenebis(dipheny1phosphine) can behave both as a chelate and as a bridging ligand and propane-1,3-diylbis(dipheny1phosphine) only as a bridging ligand. The unsaturated diphosphines (2)- and (E)-ethene-l,2-diylbis(dipheny1phosphine) both form 1 : 1 adducts with mercury(11) halides in benzene solution in which the phosphines are unidentate. Enthalpy data are reported for the formation of all these adducts.

scholarly journals Synthesis of the Guanidine Derivative: N-{[(7-(4,5-Dihydro-1H-imidazol-2-yl)-2-(p-tolyl)-6,7-dihydro-2H-imidazo[2,1-c][1,2,4]triazol-3(5H)-ylidene)amino](phenylamino)methylene}benzamide

Molbank ◽  
10.3390/m1246 ◽  
2021 ◽  
Vol 2021 (3) ◽  
pp. M1246
Author(s):  
Łukasz Balewski ◽  
Anita Kornicka
Keyword(s):  
Infrared Spectroscopy ◽  
Elemental Analysis ◽  
13C Nmr ◽  
1H And 13C Nmr ◽  
Guanidine Derivative

The guanidine derivative N-{[(7-(4,5-dihydro-1H-imidazol-2-yl)-2-(p-tolyl)-6,7-dihydro-2H-imidazo[2,1-c][1,2,4]triazol-3(5H)-ylidene)amino](phenylamino)methylene}benzamide (3) has been obtained by the reaction of one measure of N-{[7-(4,5-dihydro-1H-imidazol-2-yl)-2-(p-tolyl)-6,7-dihydro-2H-imidazo[2,1-c][1,2,4]triazol-3(5H)-ylidene]carbamothioyl}benzamide (2) with one measure of aniline in the presence of mercury(II) chloride and triethylamine in anhydrous dimethylformamide. The structure of product 3 was confirmed by 1H and 13C-NMR, infrared spectroscopy, and elemental analysis.

scholarly journals Synthesis of green and pure copper oxide nanoparticles using two plant resources via solid-state route and their phytotoxicity assessment

RSC Advances ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 3346-3353
Author(s):  
Iman Khaldari ◽  
Mohammad Reza Naghavi ◽  
Elaheh Motamedi
Keyword(s):  
Solid State ◽  
Copper Oxide ◽  
Pure Copper ◽  
Copper Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Plant Resources ◽  
Stabilizing Agents ◽  
Biological Resources ◽  
Solid State Route ◽  
Conventional Methods

Among the conventional methods in synthesizing nanoparticles, the methods that use biological resources, as reducing and stabilizing agents, can be considered eco-friendly methods.

scholarly journals Synthesis, Characterization, and Electrochemical Behaviour of Cobalt(II) and Nickel(II) Complexes with N2O2 Chelating Ligand 4,4′-(Biphenyl-4,4′-diyldinitrilo)dipentan-2-one

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Lakhdar Sibous ◽  
Embarek Bentouhami ◽  
Mustayeen Ahmed Khan
Keyword(s):  
Schiff Base ◽  
Mass Spectroscopy ◽  
Elemental Analysis ◽  
Electrochemical Behaviour ◽  
Absolute Ethanol ◽  
Molar Ratio ◽  
H Nmr ◽  
Chelating Ligand ◽  
Metal Ligand

4,4′-Diaminobiphenyl reacts with 2,4-pentanedione in absolute ethanol in a molar ratio 1 : 2 to form mainly the product of [1 + 2] condensation, 4,4′-(biphenyl-4,4′-diyldinitrilo)dipentan-2-one (H2L). The Schiff base was used as tetradentate chelating ligand to coordinate CoII and NiII chlorides leading to complexes where the ratio of metal ligand was found to be 2 : 1 or 2 : 2. All the synthesized products were characterized by elemental analysis, infrared, electronic, and mass spectroscopy, 1H NMR, and DSC. The electrochemical behaviour of the ligand and its complexes in DMF is also investigated.

Electrical Conductivity of Chloro(phenyl)glyoxime and Its Co(II), Ni(II) and Cu(II) Complexes

2003 ◽  
Vol 68 (7) ◽  
pp. 1233-1242 ◽  
Author(s):  
Orhan Turkoglu ◽  
Mustafa Soylak ◽  
Ibrahim Belenli
Keyword(s):  
Electrical Conductivity ◽  
Temperature Dependence ◽  
Electric Conductivity ◽  
Crystal Structures ◽  
Elemental Analysis ◽  
Analysis Data ◽  
Elemental Analysis Data ◽  
The Stability ◽  
Xrd Patterns ◽  
Metal Ligand

Chloro(phenyl)glyoxime, a vicinal dioxime, and its Ni(II), Cu(II) and Co(II) complexes were prepared. XRD patterns of the complexes point to similar crystal structures. IR and elemental analysis data revealed the 1:2 metal-ligand ratio in the complexes. The Co(II) complex is a dihydrate. Temperature dependence of electrical conductivity of the solid ligand and its complexes was measured in the temperature range 25-250 °C; it ranged between 10-14-10-6 Ω-1 cm-1 and increased with rising temperature. The activation energies were between 0.61-0.80 eV. The Co(II) complex has lower electric conductivity than the Ni(II) and Cu(II) complexes. This difference in the conductivity has been attributed to differences in the stability of the complexes.

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