Temperature-dependent tetragonal distortion in some thermochromic N,N-diethylethylenediamine complexes of copper(II)

Malik

et al. 2007

Transition Met Chem

115

A new series of complexes is synthesized by template condensation of glyoxal and oxalyldihydrazide in methanolic medium in the presence of divalent cobalt, nickel, copper, zinc and cadmium salts forming complexes of the type:3 ; OAc À1 . The complexes have been characterized with the help of elemental analyses, conductance measurements, magnetic susceptibility measurements, electronic, n.m.r., infrared and far infrared spectral studies. On the basis of these studies, a six coordinate octahedral geometry for these complexes has been proposed. The biological activities of the metal complexes have been tested in vitro against a number of pathogenic bacteria to assess their inhibiting potential. Most of the compounds have been found to exhibit remarkable antibacterial activities.

Section: Copper Complexessupporting

confidence: 84%

“…2 A 2g Þ transitions [39]. The band separation of the spectra of the complexes is of the order 2,500 cm )1 , which is consistent with proposed geometry of the complexes [39]. Therefore, it may be concluded that all the complexes formed by macrocycles with Cu (II) metals are distorted octahedral.…”

Section: Copper Complexessupporting

confidence: 79%

Synthesis and characterization of complexes of Co(II), Ni(II), Cu(II), Zn(II), and Cd(II) with macrocycle 3,4,11,12-tetraoxo-1,2,5,6,9,10,13,14-octaaza-cyclohexadeca-6,8,14,16-tetraene and their biological screening

Malik

et al. 2007

Transition Met Chem

115

“…x 2 2 y 2 ( 2 B 1g! 2 A 2 g ) transitions [39]. The band separation of the spectra of the complexes is of the order 2500 cm 21 , which is consistent with the proposed geometry of the complexes [39].Therefore, it may be concluded that all the complexes formed by the macrocycles with Cu(II) are distorted octahedral.…”

Section: Magnetic Measurements and Electronic Spectrasupporting

confidence: 79%

Template synthesis, spectroscopic studies and biological activities of macrocyclic complexes derived from thiocarbohydrazide and glyoxal

Journal of Enzyme Inhibition and Medicinal Chemistry

Malik

et al. 2007

A novel series of complexes of the type [M(TML)X 2 ]; where TML is Tetradentate Macrocyclic Ligand; M ¼ Co(II), Ni(II), Cu(II), Zn(II)or Cd(II); X ¼ Cl 2 , CH 3 COO 2 or NO 2 3 have been synthesized by template condensation of glyoxal and thiocarbohydrazide in the presence of divalent metal salts in methanolic medium. The complexes have been characterized by elemental analyses, conductance measurements, molecular weight determination, magnetic measurements, electronic, NMR, infrared and far infrared spectral studies. Electronic spectra along with magnetic moments suggest a six coordinate octahedral geometry for these complexes. The low molar conductance values indicates them to be non-electrolytes. The biological activities of the metal complexes have been tested in vitro against a number of pathogenic bacteria to assess their inhibitory potential.

“…14,630-16,070 cm )1 , and show that these complexes are distorted octahedra [31,32]. Assuming tetragonal distortion in the molecule, the d-orbital energy level sequence for these complexes may be: x 2 -y 2 >z 2 >xy >xz>yz and the shoulder can be assigned to: z 2 fi x 2 ) y 2 ( 2 B 1g fi 2 B 2g ) and the broad band contains both the xy fi x 2 ) y 2 ( 2 B 1g fi 2 E g ) and xz, yz fi x 2 ) y 2 ( 2 B 1g fi 2 A 2g ) transitions [33]. The band separation of the spectra of the complexes is of the order 2500 cm )1 , which is consistent with proposed geometry of the complexes [33].Therefore, it may be concluded that all the complexes formed by macrocycles with Cu(II) metals are distorted octahedral.…”

Section: Nmr Spectramentioning

confidence: 99%

Template synthesis, spectroscopic studies and biological screening of macrocyclic complexes derived from thiocarbohydrazide and benzil

Tyagi

2006

Transition Met Chem

A novel series of complexes of the type [M(TML)X 2 ]; where TML is a tetradentate macrocyclic ligand; M = Co(II), Ni(II), Cu(II) or Zn(II); X = Cl ) , CH 3 COO ) or NO 3 ) have been synthesized by template condensation of benzil and thiocarbohydrazide in the presence of divalent metal salts in methanolic medium. The complexes have been characterized with the help of elemental analyses, conductance measurements, molecular weight determination, magnetic measurements, electronic, NMR, infrared and far infrared spectral studies. Electronic spectra along with magnetic moments suggest the six coordinate octahedral geometry for these complexes. The low value of molar conductance indicates them to be non-electrolytes. The biological activities of metal complexes have been tested in vitro against a number of pathogenic bacteria to assess their inhibiting potential.