Basic Science Sector

The stoichiometry and stability constants of the complexes formed between [Pd (AMBI)(H2O)2]2+, (AMBI = 2-(aminomethyl)-benzimidazole) with some selected bio-relevant ligands containing different functional groups, were investigated at 25 0C and 0.1 M ionic strength. The ligands used are imidazole, cysteine, glutathione (GSH), threonine, aspartic acid, 1,1-cyclobutane dicarboxylic acid (CBDCA) and lysine. The stoichiometry and stability constants of the formed complexes are also reported, and the concentration distribution of the various complex species was evaluated as a function of pH. The results show ring opening of CBDCA and monodentate

A series of substituted 6-pyrazol-3-yl-pyrido[2,3-d][1,2,4]triazolo[4,3-a]pyrimidin-5-ones 8 were prepared via reaction of 5-pyrazol-3-yl-2-thioxo-2,3-dihydro-1H-pyrido[2,3-d]pyrimidin-4-one 3 or its methylthio derivatives 4 with hydrazonoyl chlorides 5. Both conventional thermal and microwave irradiation techniques were used for synthesis of the target products 8. A comparative study of these techinques in presence of a basic catalyst was performed. The mechanism of the studied reactions was discussed. Also, the products 8 were screend for their biological activities.

This article details with the synthesis and surface modification of AM50 magnesium alloy and its composite (AM50-5%ZrO2 and AM50-10% ZrO2) substrate to improve the corrosion resistance. Environmentally friendly chemical conversion coating based on permanganate–phosphate solution was used in this study. Deposition of electroless Ni–P alloy and electrodeposition Ni onto AM50 magnesium alloys have been carried out. The influences of pretreatment steps on the surface morphology and composition analysis have been studied using scanning electron microscope/energy dispersed X-ray system (SEM/EDS). Additionally, the surface morphology and phase composition of the coatings were determined with (SEM/EDS) and X-ray diffraction (XRD), respectively. Moreover, potentiodynamic polarization tests have been used to estimate the corrosion behavior of unprotected and protected AM50 Mg and its composite alloys in 5% NaCl solutions.

The biological application of labeled nanoparticles is a rapidly developing area of nanotechnology that raises new possibilities in the diagnosis and treatment of human cancers. Gold nanoparticles (GNPs) have been prepared via wet chemical method. Fluorescein capped gold nanoparticles have been prepared by a reduction of the HAuCl4 in boiling fluorescein sodium solution. The results indicated that the spectrum exhibits one curve with two absorption bands at

The identification of compounds able to treat both pain and inflammation with limited side effects is one of the prominent goals in biomedical research. This study aimed at the synthesis

A convenient synthesis of a series of thiosemicarbazide, 1,3,4-oxadiazole, 1,3,4-thiadiazole, thiazole, 1,2,4-triazole, pyrazole and dioxoisoindoline derivatives incorporating 1,2,4-triazolo[4,3-a]pyrimidine via the reaction of the readily accessible 1,5-dihydro-5-oxo-1.7-diphenyl-1,2.4-triazolo[4,3-a]pyrimidine-3-carbohydrazide (2) with the appropriate reagents is described. The newly synthesized compounds were found to possess antihypertensive and diuretic activities compared to captopril and furosemide as reference controls, respectively.

Reaction of E-3-(N,N-dimethylamino)-1-(3-methylthiazolo[3,2-a]benzimidazol-2-yl)prop-2-en-1-one (1) with some N-nucleophiles, such as anilines 2a-c, 4-amino-N-pyridin-2-yl-benzenesulfonamide (4a), 4-amino-N-pyrimidin-2-yl-benzenesulfonamide (4b), hydrazine, hydroxylamine, thiourea, and guanidine afforded the corresponding arylaminoprop-2-en-1-one derivatives 3a-c, 5a,b, the pyrazole, isoxazole, pyrimidinethione and aminopyrimidine derivatives 7a, 7b, 9a, and 9b, respectively. The utility of compound 1, as a versatile building block, for the synthesis of the pyranone 13, benzo[b]furan 17a, and naphtho[1,2-b]furan 17b was also explored via its reaction with 2-benzamidoacetic acid (10), 1,4-benzoquinone (14a), and 1,4-naphthoquinone (14b), respectively.

Pyrazolo[1,5?a]pyrimidine, [1,2,4]triazolo[1,5?a]-pyrimidine and pyrimido[1,2?a] benzimida?zole derivatives were synthesized by reaction of sodium salt of 3?hydroxy?(1?pyridin?2? yl)prop?2?en?1?one or sodium salt of 3?hydroxy?1?(pyridin?3?yl)prop?2?en?1?one with different heterocyclic amines in piperidenium acetate. Also,

A series of new 8-arylhydrazono-2-(benzylsulfanyl)-7H-purin-6-ones 6 were synthesized, their electronic absorption spectra in different organic solvents of varying polarities were investigated and their acid dissociation constants in both the ground and excited states were determined spectrophotometrically. The tautomeric structures of such products were elucidated by spectral analyses and correlation of their acid dissociation constants with the Hammett equation. The results indicated that the studied compounds 6 exist predominantly in the hydrazone tautomeric form 6A in both the ground and excited states.

Ethyl 2-acrylamido-4,5,6,7-tetrahydrobenzo [b] thiophene-3-carboxylate (ETTCA) has been synthesized and its structure has been elucidated by elemental analysis and spectral tools. Free radical polymerization of (ETTCA) has been conducted in several solvents using azobisisobutyronitrile (AIBN) as an initiator.

3-Acetyl[1,2,4]triazolo[3,4-a]isoquinolines were prepared using chitosan as a catalyst. These compounds were used to prepare a novel series of enaminones 5, and their reactions with hydrazonoyl halides 1 and 11 gave triazoloisoquinolines 8 and 13, respectively, with a carbonylpyrazole side chain. Hydrazinolysis of 8 and 13 gave the pyrazolopyridazines 10 and pyrazolopyridazinones 14. Reaction of 5 with hydroximoyl halides 15 led to triazoloisoquinoline 16 with a carbonylisoxazole side chain. Antibacterial effects of compounds 8 and 10 were studied.

The Schiff bases of N2O2 dibasic ligands, H2La and H2Lb are prepared by the condensation of ethylenediamine (a) and trimethylenediamine (b) with 6-formyl-7-hydroxy-5-methoxy-2-methylbenzopyran-4-one. Also tetra basic ligands, H4La and H4Lb are prepared by the condensation of aliphatic amines (a) and (b) with 6-formyl-5,7-dihydroxy-2-methylbenzopyran-4-one. New complexes of H4La and H4Lb with metal ions Mn(II), Ni(II) and Cu(II) are synthesized, in addition Mn(II) complexes with ligands H2La and H2Lb are also synthesized. Elemental and thermal analyses, infrared, ultraviolet-visible as well as conductivity and magnetic susceptibility measurements are used to elucidate the structure of the newly prepared metal complexes. The structures of copper (II) complexes are also assigned based upon ESR spectra study. All the complexes separated with the stoichiometric ratio (1:1) (M:L) except Mn-H4La and Mn-H4Lb with (2:1) (M:L) molar ratio. In metal chelates of the type 1:1 (M:L), the Schiff bases behave as a dinegative N2O2 tetradentate ligands. Moreover in 2:1 (M:L) complexes, the Schiff base molecules act as mono negative bidentate ligand and binuclear complex is then formed. The Schiff bases were assayed by the disc diffusion method for antibacterial activity against Staphylococcus aureus and Escherichia coli. The antifungal activity of the Schiff bases was also evaluated against the fungi Aspergillus flavus and Candida albicans.

Schiff base (L) ligand is prepared via condensation of pyridine-2,6-dicarboxaldehyde with 2-aminopyridine. The ligand and its metal complexes are characterized based on elemental analysis, mass, IR, solid re?ectance, magnetic moment, molar conductance, and thermal analyses (TG, DTG and DTA). The molar conductance reveals that all the metal