The synthesis and characterization of 10,11-bis(hydroxyimino)-4,8,12,17-tetraaza 1,2,19,20-O-dicyclohexylideneoctacosene and some transition metal complexes
E. Tas et al., The synthesis and characterization of 10,11-bis(hydroxyimino)-4,8,12,17-tetraaza 1,2,19,20-O-dicyclohexylideneoctacosene and some transition metal complexes, J COORD CH, 48(4), 1999, pp. 411-423
In this study, a novel dioxime 10,11-bis(hydroxyimino)-4,8, 12,17-tetraaza-
1,2,19,20-O-dicyclohexylideneoctacosene (LH2) has been synthesized starting
from 1,2-O-cyclohexylidene-4-aza-8-aminooctane, which has been prepared fr
om the 1-chloro-2,3-O-cyclohexylidene, and dichloroglyoxime. The structure
of this vic-dioxime has been determined as the (E, Z) form according to H-1
NMR, C-13 NMR and IR data. Mononuclear complexes with a metal to ligand ra
tio of 1:2, except for UO2(VI), have been isolated with Co(III), Co(II), Cu
(II) and Ni(II) salts. The metal to ligand ratio of the uranyl complex is 1
:1 and it has a dimeric structure. Attempts to prepare trinuclear complexes
of the ligand with Co(III), Co(II), Cu(II) and Ni(II), failed. The structu
re of the ligand and its complexes is proposed from elemental analyses, IR,
UV-VIS,C-13 and H-1 NMR spectra, magnetic susceptibility measurements, the
rmogravimetric analyses (TGA) and differential thermal analyses (DTA).