Electrochemical and structural studies of nickel(II) complexes with N2O2 Schiff base ligands derived from 2-hydroxy-1-naphthaldehyde. Molecular structure of N,N¿-2,3-dimethylbutane-2,3-diyl-bis(2-hydroxy-1-naphthylideneiminate) nickel(II)

• Type: Article in International Scientific Journal
• Date: 1993

Authors

M.A.A.F de C.T. Carrondo (Author) Other; Baltazar de Castro (Author) FCUP; Ana Maria Coelho (Author) Other; Deolinda Domingues (Author) Other; Cristina Freire (Author) Other; José Morais (Author) Other

Journal

Title: Inorganica Chimica Acta

Vol. 205

Pages: 157-166

ISSN: 0020-1693

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 41 Citations

Scopus - 43 Citations

Other information

Authenticus ID: P-00H-EZZ

DOI: 10.1016/s0020-1693(00)85533-4

Abstract (EN): Nickel(II) complexes with N2O2 Schiff base ligands based on 2-hydroxy-1-naphthaldehyde and three different diamines have been prepared and their electrochemical behaviour in (CH3)2SO studied by cyclic voltammetry. The complexes undergo reversible one-electron oxidation in this solvent and the electrolyzed solutions show rhombic EPR spectra thus supporting metal centered oxidation to form low-spin hexacoordinate nickel(III) species with two solvent molecules coordinated axially (g(z) < g(x), g(y); d(z)2 ground state). The crystal structure of N,N'-2,3-dimethylbutane-2,3-diyl-bis(2-hydroxy-1-naphthylideneiminate) nickel(II) was determined from single crystal X-ray diffraction data collected with the use of Mo Kalpha radiation: space group P2(1)/n with a = 7.285(8), b = 26.668(17), c = 11.503(7) angstrom, beta = 95.08(4)-degrees, Z = 4 (R = 0.065). The complex exhibits a novel type of packing, different from that of other nickel(II) compounds with Schiff bases, in that interaction between the monomers takes place through overlapping of the naphthyl moieties. This structure and previous X-ray structural data for the other complexes studied have provided a rationale for the E1/2 values observed in the oxidation process.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10