Unusual and “classic” anion bonding mode in bis(2-aminomethylpyridine)copper(II) salicylates

Reaction of 2-aminomethylpyridine with copper(II) acetate and 3,5-dinitrosalicylic acid or 3-methoxysalicylic acid resulted in the formation of molecular complexes [Cu(3,5-dnsal)2(ampy)2] (1) and [Cu(3-MeOsal)2(ampy)2] (2) where ampy = 2-aminomethyl-pyridine, 3,5-dnsal = 3,5-dinitrosalicylate and 3-MeOsal = 3-methoxysalicylate anion. Both complexes contain two molecules of the ampy ligand in equatorial position and the axial positions of the coordination polyhedra are occupied by oxygen atoms of individual anions. The 3,5-dinitrosalicylate anions in (1) are coordinated as phenolato anions while 3-methoxysalicylate anions in (2) are bonded in “classic” way as carboxylato anions. Spectral data reflected the differences in anion bonding and are in good agreement with found structures.

Graphical abstractTwo salicylatocopper(II) complexes [Cu(3,5-dnsal)2(ampy)2], [Cu(3-MeOsal)2(ampy)2] have been prepared, structurally and by other methods characterized. Complex [Cu(3,5-dnsal)2(ampy)2] exhibits unusual phenolato bonding mode of 3,5-dinitrosalicylato anion.Figure optionsDownload full-size imageDownload as PowerPoint slide