The ligand NN′-di-(2-aminoethyl)malondiamide, CH2(CO·NH·CH2·CH2·NH2)2(LH2), can function as a square-planar quadridentate ligand with metals able to ionise amide hydrogen atoms. Copper and nickel form neutral complexes, ML, the nickel complex being diamagnetic. With cobalt, the diamagnetic complex [CoL(NH3)2]Cl has been obtained.
H. A. O. Hill and K. A. Raspin, J. Chem. Soc. A, 1968, 3036 DOI: 10.1039/J19680003036
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