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Electronic Spectroscopy Of Some Transition Metalion Compounds In Anewionic Liquid
اسم المؤلف:
Zena Natheer Rajab
الموضوع العام:
علوم الكيمياء
السنة:
2012
الموضوع الدقيق:
الكيمياء الفيزيائية
الدرجة:
ماجستير
الجامعة:
جامعة النهرين - كلية العلوم - قسم الكيمياء
مكان الجامعة:
بغداد
الكلمات الدلالية:
Ionic equilibriums
New Photostabilizers For Poly Vinyl Chloride Based On Some Metal Complexes Of 2 - 6 Methoxynaphthalen
اسم المؤلف:
Husam Ekrayyem Salman
الموضوع العام:
علوم الكيمياء
السنة:
2012
الموضوع الدقيق:
الكيمياء اللاعضوية
الدرجة:
ماجستير
الجامعة:
جامعة النهرين - كلية العلوم - قسم الكيمياء
مكان الجامعة:
بغداد
الكلمات الدلالية:
Metallic composites
Recovery Of Molybdenum From Spent Catalysts By Leaching Process
اسم المؤلف:
maan muthafer dawood
الموضوع العام:
علوم الكيمياء
السنة:
2012
الموضوع الدقيق:
الكيمياء الصناعية
الدرجة:
ماجستير
الجامعة:
جامعة النهرين - كلية العلوم - قسم الكيمياء
مكان الجامعة:
بغداد
الكلمات الدلالية:
molybdenum
الخواص الثرموديناميكية والحجمية لبعض الفيتامينات الذائبة - مائيا في حامض الهيدروكلوريك المخفف وكذللك في المحاليل المائيه لملح كلوريد الصوديوم عند درجات) 51.392 و51.392 و1.392 . و1.392 . (كلفن == Thermodynamic and Volumetric Properties of Some Water - Soluble Vitamins in Dilute HCl and in Aqueous NaCl Solutions at (293.15, 298.15, 303.15, and 308.15) K
اسم المؤلف:
خطاب عدنان عبد
اسم المشرف:
تغريد علي سلمان
الموضوع العام:
علوم الكيمياء
السنة:
2012
الموضوع الدقيق:
الكيمياء
الدرجة:
ماجستير
الجامعة:
جامعة النهرين - كلية العلوم - قسم الكيمياء
اللغة:
الانكليزية
مكان الجامعة:
بغداد
الصفحات الاولى:
المستخلص:
Densities , ρ, and viscosity, η, have been measured for ascorbic acid, thiamin HCl, nicotinic acid and pyridoxine HCl have been measured in water and in aqueous sodium chloride solutions at (293.15, 298.15, 303.15 and 308.15) K. The apparent molar volumes were determined from the measured density data. These volumes were extrapolated to zero using suitable empirical or theoretical equations to determine the corresponding infinite dilution values.Ionization of the vitamins under studied were suppressed using sufficiently acidic solutions. Apparent molar volume at infinite dilution for all vitamins, were found to be increase with increasing temperature in acidic solution and the presence of co - solute NaCl. On the other hand, increasing the concentration of co - solute NaCl leads to decrease the apparent molar volumes. These results were interpreted in terms of complex vitaminswater - co - solute NaCl interactions.Apparent molar volumes of transfer at infinite dilution for vitamins from water solutions to NaCl solution at various temperatures in the range (293.15 - 308.15) K were calculated. The resulting data have been utilized to the effect of overlapping of the hydration co - spheres on net volume of vitamins. The viscosity data have been analyzed using Jones - Dole equation, and the derived parameters, Jones - Dole coefficient, B, and Falkenhagen coefficient, A, were interpreted in terms of solute - solvent and solute - solute interactions respectively, for ascorbic acid, thiamin HCl, nicotinic acid and pyridoxine HCl. The variation of B coefficient with temperature, (dB/dT), have been also calculated for vitamin solutions, and the obtained data was interpreted on the basis of the structure - making and structure - breaking behavior.Free energy of activation of viscous flow per mole of solvent, Δμ1°, and solute, Δμ2°, were obtained by application of the transition - state theory to the B coefficient data and the corresponding activation enthalpy, ΔH0, and entropy of activation, ΔS0, of viscous flow were also determined for vitamins.
👁 مشاهدة
مثبتات ضوئية جديدة لبولي كلوريد الفانيل باسخدام بعض ايونات العناصر لمعقدات2 - 6 - ميثوكسي نفثالين - 2 - وايل بروبانويت
اسم المؤلف:
حسام اكريم سلمان
اسم المشرف:
عماد عبد الحسين يوسف السراج | جواد كاظم شنين
الموضوع العام:
علوم الكيمياء
السنة:
2012
الموضوع الدقيق:
الكيمياء
الدرجة:
ماجستير
الجامعة:
جامعة النهرين - كلية العلوم - قسم الكيمياء
اللغة:
الانكليزية
مكان الجامعة:
بغداد
الصفحات الاولى:
المستخلص:
The preparation of Bis[2 - (6 - methoxynaphthalen - 2 - yl)propanoate] chelate complexes with nickel(II), copper(II), zinc(II), cadmium(II) and tin(II) were described in this thesis.Infrared, ultraviolet - visible, spectrophotometric techniques, magnetic susceptibility, atomic absorption, conductivity measurements and melting point were used to characterize the free ligand and the above chelate complexes. All these complexes were found to act as stabilizer in PVC films.The light of wavelength (313 nm) with intensity of (1.052×10 - 8 ein.dm - 3.S - 1) was used for irradiation of polymer films at room temperature. The rate of photodegradation and photostabilization of PVC film (thickness 30 m) were monitored by measuring the carbonyl, polyene, hydroxyl and chlorine indices (Ico, Ipo, IoH and Icl) values as a function of irradiation time and ultraviolet - visible spectrophotometry using 0.5% wt/wt concentration of stabilizer.It was found that the carbonyl index (Ico), polyene index (Ipo) and hydroxyl index (IoH) values increased with irradiation time, while the chlorine index (ICl) values decreased with irradiation time, and this increase depend on the type of additives (free ligand and complexes).The following trend was obtained for the photostabilization effect of PVC film in presence of these additives : Cd(L)2 > Zn(L)2 > Sn(L)2 > Ni(L)2 > Cu(L)2.According to the experimental results obtained several mechanisms were suggested depending on the structure of the additives. Among these mechanisms, HCl scavenging, UV absorption, peroxide decomposer and radical scavenger for photostabilizer additives.The mode of chain scission was also investigated by measuring the variation of average viscosity molecular weight with irradiation time for PVC films with and without additives. It was found that the values of the variation of average viscosity molecular weight decreased with increasing irradiation time
👁 مشاهدة
تحليل الطيف الالكتروني لمركبات ايونات بعض العناصر الانتقالية في سائل ايوني جديد
اسم المؤلف:
زينة نذير رجب
اسم المشرف:
هادي محمد علي عبود
الموضوع العام:
علوم الكيمياء
السنة:
2012
الموضوع الدقيق:
الكيمياء
الدرجة:
ماجستير
الجامعة:
جامعة النهرين - كلية العلوم - قسم الكيمياء
اللغة:
الانكليزية
مكان الجامعة:
بغداد
الصفحات الاولى:
المستخلص:
The behavior of some transition metal cations [Cr (III), Fe (III), Fe (II), Co (II), Ni (II) and Cu (II)] were investigated in ammonium alum - urea ionic liquid. The study was followed by UV - Visible electronic spectroscopy to establish their coordination geometry in the liquid and estimate the ionic species attached to the transition metal cations.The reactivity of the metal cations were found to vary from one to another. Chromium (III) cation was found, (as expected) to be in octahedral geometry with ionic liquid species and was inert toward the addition of ligands. Similarly iron (III) did not show a tendency to react with added ligands, yet charge transfer was prevailed. However, interesting iron (II) showed high spin octahedral coordination with thiocyanate ion but a low spin octahedral complex with nitrite ion.Cobalt (II) showed an interesting behavior in alum - urea ionic liquid, as it coordinated in an octahedral geometry with its ionic species. A gradual geometrical changes were appeared as a major change in their spectra most probably forming a mixture of two species tetrahedral with some original octahedral complex when its solution was studied with increasing thiocyanate ion concentration up to 35 thiocyanate : 1 cobalt mole ratio.The solubility limit of nitrite in ionic liquid ceased the concentration ratio of nitrite : cobalt to be 5 : 1.Nickel (II) also showed an octahedral geometry behavior in ionic liquid species. It reacts with added ligands particularly when theconcentration of thiocyanate ion : Ni (II) increased up to 30 to 1 mole ratio, the color changed from pale green to olive - green solution.Cupper (II) cation showed a clear blue solution and its spectra are assigned to be octahedral geometry, while the added nitrite did not show color change but less absorbance was recorded. However, thiocyanate ion seems to react with cupper (II) ionic liquid solution producing suspended green solution with much less absorbance than with ionic liquid.Interestingly, the water molecules present in the original ammonium alum was not found to coordinate with metal cations as their spectra was found to differ when compared with those obtained in aqueous solution.
👁 مشاهدة
فعالية انزيم سوبر اوكسيد دسميوتاز ونمط الدهون في مصول بعض المرضى المصابين بامراض القلب الوعائية == Superoxide Dismutase Activity And Lipid Profile In Sera Of Some Cardiovascular Diseases
اسم المؤلف:
رغدة صخر مجيد السيد
اسم المشرف:
سلمان علي احمد
الموضوع العام:
علوم الكيمياء
السنة:
2012
الموضوع الدقيق:
الكيمياء الحياتية
الدرجة:
ماجستير
الجامعة:
جامعة النهرين - كلية العلوم - قسم الكيمياء
اللغة:
الانكليزية
مكان الجامعة:
بغداد
الصفحات الاولى:
👁 مشاهدة
تاثير كاربون نانوتيوب على الخواص الفيزيائية - 4 ميثوكسي ( - N للمركب البلوري السائل النيماتي بنزلدين) - 4 - ن - بيوتل انلين == Effect Of Carbon Nanotube On Physical Properties Of The Nematic Liquid Crystal N - (4` - Methoxybenzylidene) - 4 - Nbutylaniline (MBBA)
اسم المؤلف:
الاء عدنان رشاد
اسم المشرف:
Mehdi S. Shihab | Nasreen R. Jber
الموضوع العام:
علوم الكيمياء
السنة:
2012
الموضوع الدقيق:
الكيمياء
الدرجة:
ماجستير
الجامعة:
جامعة النهرين - كلية العلوم - قسم الكيمياء
اللغة:
الانكليزية
مكان الجامعة:
بغداد
الصفحات الاولى:
👁 مشاهدة
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