Browsing by Author "Assefa Tesfaye"

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    Investigation of Complexation Behavior of Ninhydrin and Amino Acids Towards Cobalt(II) Ions using Fluorescence Spectroscopy
    (Addis Ababa University, 2007-08) Assefa Tesfaye; Redi Mesfin
    The amino acids (glycine and alanine) and ninhydrin derivatives of shiff base (ketimine) and Ruhemann’s purple complexes of Co(II) were prepared and studied using fluorescence and UV/VIS absorption spectroscopy. The Ruhemann’s purple complex were found to have two emission bands at 420nm (23810cm−1) and 490nm (20410cm−1). The existence of iso-emission point in the emission spectra of Ruhemann’s purple complex shows the existence of two structures of the complex at equilibrium. The fluorescence spectra of glycine ninhydrin shiff base in DMF solution were found to have also an iso-emission point showing possible two structures. The emission band lies in ultra violate region and 350nm (28570cm−1) band can be seen resolved. From the spectra of both complexes the octahedral symmetry group were suggested for the two complexes