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" Synthesis and Characterization of Tetradentate Complexes Type N2O2 From the Reaction of 2-Hydroxy -1, 2-Diphynel-Ethanone Oxime [H2L] With Mn II, Fe II, Co II, Ni II, Cu II and Hg II  Ions." <em>Ibn AL- Haitham Journal For Pure and Applied Sciences</em> [Online], 22.3 (2009): n. pag. Web. 18 Aug. 2021