Bivalent Metal Complexes of N-(2-Pyridylmethyl)-2-(dimethylamino)acetamide

Abstract

The complexes of N-(2-pyridylmethyl)-2-(dimethylamino)-acetamide(pdgH), M(pdg)XenH, O (M=Pt, Pd, Ni, Cu; X=Cl, Br, NCO, NCS, CIOs, 1/2 SO), were studied by means of magnetic moments, and infrared, electronic and NMR spectra (Tables 2 v5). The terdentate 1igand coordinates with deprotonated amide-N, pyridine-N, and amino-N atoms (Fig.1), The pletinum, palladium aRd nickel complexes arediamagnetic and square-planar, while the copper complexes have normal magnetic moments and their structure is a tetragonally distorted octahedron.
The trans-influence of the amide-N atom in infrared spectra Iis estimated to be as strong as the sulfide-S atem (Table 3). The chemical shifts of ligaind-hydrogens in thecomplexes vary with both anions and metal ions (Table 5 and Fig. 4) and, the ha16gen-dependent part of the chemical shifts of the pyridine ring 6-H is interpreted as arisin-g -fro, rp -sp-atial prowding between the hydrogen and halogen atoms.The oxygen atom ef the ampde groUp whosenitrogen is eoordinated to a metal ion under depretonatien has a slightlYts kkl, e.s ab.i lity of coordination than thatof a free acid amide. The nature of acid amide, groups aliphatic or aromatic, isreflected on electronic spectra, espeeially on those of the palla, dium and L platinum complexes.