Synthesis and Characterization of Some Mononuclear Complexes of the Schiff Base {N,N′‐2,2′‐Bis(Aminoethyl)Methylaminebis‐(3‐Carboxysalicylaldimine)}

Reaction of 3‐formylsalicylic acid with diethylenetriamine yielded the Schiff base {N,N′–2,2′‐bis(aminoethyl)methylaminebis(3‐carboxysalicylaldimine)}, abbreviated as H4fsadien. The interaction of H4fsadien with CoCl2 · 6H2O, Ni(OAc)2 · 4H2O, Cu(OAc)2 · H2O, Zn(OAc)2 · 2H2O, Na2MoO4 · 2H2O, WO2(acac)2, (NH4)2[MoOCl5], (pyH)2[Mo(SCN)6], FeSO4 · 7H2O and FeCl3 · 6H2O under varied reaction conditions have been studied. The reactions of some of the new metal complexes isolated in this study have also been investigated with a view to develop new preparative methods. The Schiff base H4fsadien was found to act as a dibasic tetradentate ligand or as a dibasic pentadentate ligand, by using N2O2 or N3O2 donor sites, respectively. Elemental analyses, molecular weights, magnetic moment values, molar conductances and spectroscopic (IR, UV‐Vis and 1H NMR) data characterize the complexes.