A novel O-N-N-O-type tetradentate ligand H4mda (H4mda = malamido-N,Nc′-diacetic acid) and the corresponding square-planar copper(II) complexes have been prepared and characterized. The mda4- ligand coordinates to the copper(II) ion via two pairs of deprotonated ligating atoms (two carboxylate oxygens and two deprotonated amide nitrogens) with in-plane square chelation. A four-coordinate, square-planar geometry has been established crystallographically for the [Co(H2O)6][Cu(mda)]·2H2O complex. Structural data correlating the square-planar geometry of the [Cu(mda)]2- unit are discussed in relation to information obtained for similar complexes. The i.r., electronic, absorption and reflectance spectra of the complexes are analysed in comparison with related complexes of known geometries. © 2000 Kluwer Academic Publishers.
Square-planar copper(II) complexes with a novel tetradentate amido-carboxylate ligand. Crystal structure of [Co(H2O)6][Cu(mda)] · 2H2O / Matović, Zoran D; Ristić, Bojan; Joksović, Milan; Trifunović, Srećko R.; Pelosi, Giorgio; Lanelli, Sandra; Ponticelli, Gustavo. - In: TRANSITION METAL CHEMISTRY. - ISSN 0340-4285. - 25:6(2000), pp. 720-726. [10.1023/A:1007051908027]
Square-planar copper(II) complexes with a novel tetradentate amido-carboxylate ligand. Crystal structure of [Co(H2O)6][Cu(mda)] · 2H2O
PELOSI, Giorgio;
2000-01-01
Abstract
A novel O-N-N-O-type tetradentate ligand H4mda (H4mda = malamido-N,Nc′-diacetic acid) and the corresponding square-planar copper(II) complexes have been prepared and characterized. The mda4- ligand coordinates to the copper(II) ion via two pairs of deprotonated ligating atoms (two carboxylate oxygens and two deprotonated amide nitrogens) with in-plane square chelation. A four-coordinate, square-planar geometry has been established crystallographically for the [Co(H2O)6][Cu(mda)]·2H2O complex. Structural data correlating the square-planar geometry of the [Cu(mda)]2- unit are discussed in relation to information obtained for similar complexes. The i.r., electronic, absorption and reflectance spectra of the complexes are analysed in comparison with related complexes of known geometries. © 2000 Kluwer Academic Publishers.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
