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Register a new userSynthesis and Identification Some of Schiff Bases Derived From Salicylaldehyde and Determination of kinetic parameters reliance on Extraction technique
اصطناع بعض أسس شيف مشتقة من الساليسيل الدهيد و توصيفها و تعيين البارامترات الحركية اعتماداً على تقنية الاستخلاص
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يركز هذا البحث على تصنيع أسس شيف رباعية التسنن من تكاثف الساليسيل الدهيد مع 1,4 -ثنائي 1 أمينوالبنزن، 1,3- ثنائي أمينوالبنزن، و حددت هوياتها بالتقنيـات الطيفيـة المختلفـة ( ,MS-GC H- IR,NMR) ،و درس تأثير زمن الرج في عملية استخلاص النحاس ثنائي التكـافؤ، و مـن خـلال هـذه الدراسة حسبتْ و نوقشتِ البارامترات الحركية من المخططات البيانية التي حصلنا منها على أفـضل خـط مستقيم من رسم (x-a(log مقابل الزمن أو نتيجة رسم (x-a/(1 مقابل الزمن إذ إن x-a (يمثل تركيـز النحاس المتبقي بالطور المائي، و منها حسبتِ البارامترات الحركية التي تمثل: (n) رتبة التفاعل، (K) ثابت سرعة التفاعل، (2/t1) عمر النصف للتفاعل بين المرتبطات المحضرة و النحاس ثنائي التكافؤ.
This work was focused on the synthesis of tetradentate Schiff bases which were prepared by condensation of salicylaldehyde with 1,4-diaminobenzene and 1,3-diaminobenzene. The Schiff base ligands were checked by different spectral technique (GC-MS, 1H-NMR, IR). The influences of shaking time on the extraction of Cu (II) using solvent extraction technique was studied. Then the Kinitic parameters were calculated from schemes which give best line through drawing log (a-x) vs time or 1/(a-x) vs time or [Cu2+] vs time, whereas (a-x) represents Cu(II) concentration in water phase and from it (n) reaction order, (K) reaction rate constant (t1/2) reaction half between prepared ligand and Cu (II) were calculated.
References used
Ambroziak K., Szypa M. (2007). A synthesis of Unsymme-trical Chiral Salen Ligands. Ved From 2-Hydroxy naphthaled and Substitued Sal. Cylodes. Tetrahedron Lett, 48 , 4477–4480
Singh A., Gupta V. K.; Gupta B. (2007). Chromium(III) selective membrane sensors based on Schiff bases as chelating ionophores. Anal. Chim. Acta, 585, 171-178
Cozzi P. (2004). Metal-Salen Schiff base complexes in catalysis: practical aspects. Chem. Soc. Rev., 33, 410-421
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macrocyclic hydrazone Schiff base was synthesized by reaction of
succinicdihydrazide, Adipicdihydrazide with acetylacetone, adipicdihydrazide
with terephtaldialdehide and sebacicdihydrazide with terephtaldialdehide.
Some kinetic parameters have been determined in this work for thermal and catalytic
cracking of the mixed of polyethylene and polypropylene using batch method. The
cracking reaction was carried out at different temperature 470,490 and 510oC under
atmospheric pressure. The mass of products (liquid and gas fractions) were determined and
used to plot the curves of the thermal and catalytic decomposition. We used two types of
catalysts: Syrian natural Zeolite and the same after loading with sulfate ions using
impregnation method. The thermal cracking has a long time and has firs-pseud order
reaction. While in the case of catalytic process we note that the reaction finished in the
short time and the process is the Zero-pseud order reaction. The rate of the cracking
increased very much, the rate constant was k1=0.0032.min-1 in the thermal cracking at
4700C and ko=0.111.min-1 in the case of catalytic cracking in presence of Z catalyst and
ko= 0.206 min-1 in presence of 15-SO4
2-/Z as catalytic at the same temperature. In the other
hand activation energy was 208.7 kj/mol in the thermal process and decreased to 116.6
kj/mol at Z catalytic presence and to 87.3 kj/mol at 15-SO4
2-/Z catalytic presence.
In this research we have synthesized a new macrocyclic Schiff base
containing N2O5 donor atomes which was prepared by reaction of 1,7- bis (6-
methoxy - 2 - formyl phenyl)-1,4,7,10,13-penta oxa tridecane with 4',4- oxy
dianiline.
A novel Azo-Schiff base ligand L 2-[1.5-Dimethyl-3-[2-(5-methyl-1H-indol-
3-yl) - ethylimino] - 2 - phenyl - 2,3 - dihydro - 1H - pyrazol - 4 - ylazo] - 5-
hydroxy -benzoic acid has been synthesized from reaction 1.5-Dimethyl-3-[2-(5-
methyl- 1H -
indol - 3 - yl) - ethylimino] - 2 - phenyl - 2.3 - dihydro - 1H -
pyrazol - 4 - ylamine (A) with m-hydroxy benzoic acid. Then, its Zn(II), Cd(II)
and Hg(II) complexes were synthesized with the general formula [ML1Cl]
where M = Zn(II), Cd(II) and Hg(II) are reported. The ligand and its metal
complexes have been characterized by elemental analysis, metal content,
Chloride containing, molar conductance, FT-IR, 1H and 13C- NMR, UV-Vis
spectra, magnetic susceptibility, thermal analysis, and mass spectra. The
activation thermodynamic parameters, such as ΔE*, ΔH*, ΔS* ΔG* and K are
calculated from the TGA curve using Coats-Red fern method. The all prepared
complexes were assayed for antibacterial (Escherichia coli and Staphylococcus
aureus) activities by disc diffusion method. The results indicate that all tested
ligand and complexes show antibacterial activity against E. coli and S aureus,
as gram negative and positive bacteria.
Separation with solvent extraction of Cu(II), Hg(II), and Cr(III) from
aqueous solution using the ligend (HL) as a new extractant has been studied.
The new acyclic Schiff Base (HL) was synthesized by reaction of 5-bromosalicylaldehyde
with 2-(2-Am
inoethyl)pyridine. The structure of the new
compound (HL) was confirmed by using FT-IR spectra, 1H-NMR and 13CNMR
spectra and mass spectra (MS). The effect of chloroform and
dichloromethan as organic solvents in the metal extractions was investigated at
20oC by using UV-visible Spectrometry. The influence of pH, ligand
concentration, shaking time and ratio of aqueous-to-organic phases on
extraction yield was tested at 20oC. The extractability of the tested metal ions
were evaluated.
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