187595-92-2Relevant academic research and scientific papers
Preparation, spectral behaviour and oxidation of some new zinc(II) salicylaldimines containing sterically hindered phenol
Kasumov, Veli T.
, p. 2337 - 2344 (2007/10/03)
A series of new bis[N-(2,6-di-tert-butyl-1-hyxyphenyl)salicylideneminato]zinc(II) complexes bearing one or two HO- and CH3O-substituents on the salicylaldehyde moiety were prepared, and their spectroscopic properties (IR, electronic, 1H NMR) as well as the ESR spectra of the one-electron oxidation products were examined. The 1H NMR examination of Zn(Lx)2 indicates that, contrary to expectations, the proton resonances of the complexes are shifted to the high-field side compared with those of the free ligands. Oxidation of these compounds with PbO2 results in the formation of mono- and biradical types Zn(II)-stabilized phenoxyls in which there are both anisotropic and alternating line-width trends. Some spectral patterns are typical for weak interacting (J?A) or the case of J～A biradicals, in which ESR signal appeared as superimposition of two non-interacting monoradical centers with S = 1/2. ESR studies on biradicals type of Zn(L·x)2 at 300 and 77 K did not show any evidence of strong exchange coupling in these systems. All radical species were characterized by the ESR parameters.
Synthesis and characterization of some cobalt(II), nickel(II), and zinc(II) complexes with Schiff bases derived from the reaction of 4-hydroxysalicylaldehyde and o-vanillin wiht 3,5-di(tert-butyl)-4-hydroxyaniline
Tuemer, Mehmet,Koeksal, Hueseyin,Serin, Selahattin,Patat, Saban
, p. 59 - 68 (2008/10/09)
Two new Schiff bases have been synthesized by the condensation 3,5-di(tert-butyl)-4-hydroxyaniline with 4-hydroxysalicylaldehyde (HL) and o-vanillin (HL'). The complexes of cobalt(II), nickel(II) and zinc(II) with HLand HL' have been prepared. The analytical data show that the metal to ligand ratio in the complexes is 1 : 2. Molar conductance measurements i ndicate that the complexes are non-electrolytic in nature. The ligands and their complexes are characterized on the basis of analytical data, conductivity measurements, magnetic moments, infrared, electronic spectraldata and thermal analyses (DRA and TG). The (13)C and (1)H NMR spectra of the Schiff base ligands have been recorded.
