Synthesis and characterization of Ni(II), Cu(II) and Co(III) complexes with polyamine-containing macrocycles bearing an aminoethyl pendant arm

Abstract

Reaction of [M(ppn)2]X2 (where M = Cu(II), Ni(II), Co(II) and ppn = 1,3-diaminopropane) with formaldehyde and ethylenediamine in methanol results in the ready formation of a 16-membered macrocyclic complex. The complexes were characterized by elemental analysis, IR, EPR, electronic spectral data magnetic moments and conductance measurements. The Cu(II), Ni(II) and Co(III) complexes are coordinated axially with both pendant groups of the hexadentate macrocycle. These pendant donors are attached to the macrocycle by a carbon chain. The electrical conductivities of the Cu(II) and Ni(II) chelates indicated them to be 1:2 electrolytes whilst those of Co(III) is a 1:3 electrolyte in DMSO. The EPR spectrum of the copper complex exhibited G at 3.66, which indicates a considerable exchange interaction in the complex. Spectroscopic evidence suggests that in all of the complexes the metal ion is in an octahedral environment.

Preparation and Spectral Study of New Complexes of Some Metal Ions with 3,5-Dimethyl-1H-Pyrazol-1-yl Phenyl Methanone

“…The magnetic susceptibility measurement after diamagnetic corrections yielded a magnetic moment of 4.85 BM which is close to that expected for an octahedral Co(II) complexes [15,16]. The electronic absorption spectrum showed two absorption bands (as shown in table (3) at (13513 & 18691) cm -1 which is considered as υ 2 and υ 3 respectively.…”

“…At room temperature the magnetic susceptibility measurement after diamagnetic corrections yielded a magnetic moment of 3.92 BM which is close to that expected for an octahedral Cr(III) complexes [15,16]. The Uvvisible spectrum of the dark green solution of chromium the Cr(III) complex showed three bands with the absorbance maxima at 15267 cm -1 , 20202 cm -1 and 32595 cm -1 which were considered as υ 1 , υ 2 , and υ 3 absorption bands respectively (table 3).…”

“…The ultraviolet spectrum of the synthesized ligand in ethanol showed two absorption bands, the position of the first band at 225 nm which represents the (π -π*) transition, while the position of the second band (which has higher intensity than the first band due to conjugated system) appeared at 285 nm which represents the (n -π*) transition. Generally, the bands of the newly synthesized complexes are either shifted to shorter or longer wavelengths than that of ligands, but the high intensity bands is an indication for complex formation [15][16][17]. Table (3) shows the electronic absorption peaks for the ligand (L) and its complexes.…”

Synthesis, Spectral Characterization and Biological Evaluation of Schiff Base Metal Complexes Derived from Aniline Derivative

“…This complex displayed that the spectra is axially symmetrical with no hyperfine splitting. Commonly [24]. It concluded that the presented complex have high g|| value of four N donors sites, which consist of a six coordinated complex 3 has a distorted octahedral Cu(II) ion.…”

Synthesis, characterization and biological activities of transition metal chelates of 2-aminothiazole-derived Mannich bases

“…The electronic spectral data of Cu(II), Co(II) and Ni(II), complexes of the ligand BTMTA were recorded in DCM and the spectral data are given in Table.3 . The brown colored Cu(II) complex exhibit a broad asymmetric band in the region 12275-16262 cm -1 with maxima at 15194 cm -1 in an distorted octahedral geometry [31,32]. The broadness of the band may be due to dynamic Jahn-Teller distortion and is assigned to 2 T 2g → 2 E g transitions.…”