S. Sujatha et al., Exogenous bridging and nonbridging in Cu(II) complexes of Mannich base ligands: Synthesis and physical properties, P I A S-CH, 112(6), 2000, pp. 559-572
Citations number
24
Categorie Soggetti
Chemistry
Journal title
PROCEEDINGS OF THE INDIAN ACADEMY OF SCIENCES-CHEMICAL SCIENCES
Preparation of pentadentate ligands L-1, L-2, L-3 and L-4, where L-1 4-chlo
ro-3-methyl-2[(prolin-1-yl)methyl]-6-[N-phenyl piperazin-1-yl)methyl]phenol
, L-2 = 4-ethyl-2-[(prolin-1-yl)methyl]-6-[(N-phenyl piperazin-1-yl)methyl]
phenol, L-3 = 4-chloro-3-methyl-2-[(prolin-1-yl)methyl]-6-[N-methyl piperaz
in-1-yl]methyl phenol, L-4 = 4-methoxy-2-[(prolin-1-yl)methyl]-6-[(N-phenyl
piperazin-1-yl)methyl]phenol is described together with that of the corres
ponding Cu(II) complexes with various bridging motifs like OH, OAc and NO2.
The complexes are characterized by elemental analysis, electrochemical and
electron paramagnetic spectral studies. Redox properties of the complexes
in acetonitrile are highly quasireversible due to the chemical or/and stere
ochemical changes subsequent to electron transfer. The complexes show resol
ved copper hyperfine EPR at room temperature, indicating the presence of we
ak antiferromagnetic coupling between the copper atoms. Strengths of the an
tiferromagnetic interactions are in the order NO2 > OAc > OH.