تحضير وتشخيص الليكاندان N,N\ - Bis (Pyridyl - 2\ - azomethinyl) - 1,2 - Ethylene and N,N\ - Bis (Pyridyl - 2\ - methylene) - 1,2 Ethylenediamine ومعقداتهما مع بعض ايونات العناصر == Synthesis & Characterisation Of The Two Ligands N,N\ - Bis(Pyridyl - 2\ - azomethinyl) - 1,2 - Ethylene and N,N\ - Bis(Pyridyl - 2\ - methylene) - 1,2Ethylenediamine and Their Complexes With Some Metal Ions