رسائل ماجيستير
English
2016
Electronic Magnetic Resonance Spectrum of Some Organic Materials
حسب الرسول إسماعيل حمزة, مبارك درار عبدالله, نجلاء محمد عبدالغني عثمان
كلية الهندسة والتكنولوجيا-جامعة الجزيرة · السودان
Magnetic Resonance is the phenomena in which an external magnetic field applied to an atom split the energy level into sub levels. The energy difference between these sub levels is proportional to the magnetic field strength. Electron Spin Resonance is technique for studying chemical species that have one or more unpaired electrons such free radicals. Electrons having spin in the direction of the external magnetic field occupy lower sub level, while those having spin in the direction opposite to that of the external field occupy upper sub level. When a photon of appropriate energy equal to the difference between the two levels is incident on the atom, the photon is absorbed by an electron in the lower sub level and it make transition to the upper sub level. Thus resonance takes place due to this photon absorption. The aim of this study to obtain electronic resonance spectrum to use instead of nuclear magnetic resonance spectrum. This was applied to four sample ( water, methanol, hexanol and N,N – Dimethyl formamaide) , to measure wave length and chemical shift,δis (δ ,ppm) and comparing results between electronic magnetic resonance spectrum and nuclear magnetic resonance spectrum , water gives a frequency 5.34x1014 Hz while in the chemical shift,δis ( δ , ppm) 1.24 , 1.33 , 1.56 and methanol gives frequency is 4.24 x1014 Hz ,4.52 x1014 Hz , 4.83 x1014 Hz while the chemical shift, δis(δ,ppm) 3.24, 3.34 ,3.49 and hexanol frequency 4.8x1014 Hz , 5. 52x1014 Hz while the chemical shift,δis (δ,ppm) 0.76,0.81,0.88 and N,N – Dimethyl formamide frequency is 5.35x1014 Hz, 4.15x1014 Hz while in chemical shift,δis (δppm) 7.8,8.1,8.2. These results were compared with nuclear magnetic resonance spectrum and they were found very near within references. Due to these results nuclear magnetic resonance spectrum can be used as reference this agrees with the fact that these organic compounds emit the same photon within the visible spectrum range. This study recommended that more investigations are needed to apply in other organic compounds.