Bivalent nickel complexes of 2,4,6-Tri(2'-pyridyl)-1,3,5-triazine

1967 ◽  
Vol 20 (9) ◽  
pp. 1841 ◽  
Author(s):  
RS Vagg ◽  
RN Warrener ◽  
EC Watton
Keyword(s):  
High Spin ◽  
Coordination Compounds ◽  
Magnetic Moments ◽  
Nickel Complexes ◽  
Protonated Form ◽  
Octahedral Coordination ◽  
Additional Possibility ◽  
Metal Ligand

The preparation of a series of new coordination compounds of bivalent nickel with the terdentate ligand 2,4,8-tri(2?-pyridyl)-1,3,5-triazine and various anions (Cl-, Br-, I-, CNS-, or ClO-4) is reported. Compounds having metal-ligand ratios of 1 : 2, 1 : 1, and 2 : 1 were isolated, and in the last case the possibility of simultaneous terdentate and bidentate behaviour is discussed. In all cases the compounds formed were high-spin with magnetic moments ranging between 3.1 and 3.3 B.M. In general, octahedral coordination is proposed for these compounds. The additional possibility of five-coordination in the case of the 1 : 1 complexes is discussed, but such coordination could not be confirmed by the investigations employed. The isolation of a series of coordination compounds containing a protonated form of the ligand is also reported.

Coordination compounds of manganese(II) with Tetrahydro-1,4-thiazin-3-one and Thiazolidine-2-thione

1976 ◽  
Vol 29 (3) ◽  
pp. 543 ◽  
Author(s):  
C Preti ◽  
G Tosi
Keyword(s):  
Field Theory ◽  
Infrared Spectroscopy ◽  
Oxygen Atom ◽  
Coordination Compounds ◽  
Metal Ion ◽  
Magnetic Moments ◽  
Crystal Field Theory ◽  
Characterization Studies ◽  
Metal Ligand

Synthetic and characterization studies of manganese(11) complexes with tetrahydro-l,4-thiazin-3-one (tht) and thiazolidine-2-thione (ttz) are reported. The methods used for the characterization of the compounds include elementary analyses, molar conductances, magnetic moments and electronic and infrared spectroscopy. Assignments for the metal-ligand modes have also been made; the tht derivatives are coordinated through the oxygen atom, while the ttz derivatives are nitrogen-bonded in all the complexes. By use of infrared spectroscopy it has been possible distinguish whether or not the polyanions present in these derivatives are coordinated to the metal ion or are present as free ions.The wavelengths of the principal absorption peaks have been accounted for quantitatively in terms of the crystal field theory. The values of B and C obtained are significantly lower than the corresponding value for the free gaseous ion.

Coordination Compounds of Some 3d-Transition Metal Ions with N1-[4-(4-bromo-phenylsulfonyl)-benzoyl]-N4-(4-methoxyphenyl)- thiosemicarbazide

2008 ◽  
Vol 59 (7) ◽  
Author(s):  
Madalina Angelusiu ◽  
Maria Negoiu ◽  
Stefania-Felicia Barbuceanu ◽  
Tudor Rosu
Keyword(s):  
Coordination Compounds ◽  
Magnetic Moments ◽  
Thermo Gravimetric Analysis ◽  
Electronic Spectroscopy ◽  
Transition Metal Ions ◽  
Synthesis And Characterization ◽  
Gravimetric Analysis ◽  
Thermo Gravimetric ◽  
New Compounds

The paper presents the synthesis and characterization of Cu(II), Co(II), Ni(II), Cd(II), Zn(II) and Hg(II) complexes with N1-[4-(4-bromo-phenylsulfonyl)-benzoyl]-N4-(4-methoxyphenyl)-thiosemicarbazide. The new compounds were characterized by IR, EPR, electronic spectroscopy, magnetic moments, thermo-gravimetric analysis and elemental analysis.

scholarly journals Template Synthesis, Characterization and Biological Activity of Cu(II), Ni(II), Co(II), Zn(II)Complexes with Isonicotinoylhydrazone--2-aldehydefluorene Ligand

2010 ◽  
Vol 7 (1) ◽  
pp. 227-233
Keyword(s):  
Experimental Data ◽  
Escherichia Coli ◽  
Thermal Analysis ◽  
Biological Activity ◽  
Nmr Spectra ◽  
Magnetic Moments ◽  
Analytical Data ◽  
Azomethine Nitrogen ◽  
Tetrahedral Geometry ◽  
Metal Ligand

This is about synthesizing new complex combinations of Cu(II), Ni(II),Co(II), Zn(II) with aroylhydrazone ligand isonicotinoylhydrazone-2-aldehydefluorene (INHAF) made by condensation of isonicotinoylhydrazine with 2-aldehydefluorene. The complexes have been characterized by analytical data, IR, UV-Vis, NMR spectra, magnetic susceptibility values, thermal analysis and for the Cu(II) complex the ESR spectrum has been registered. For all complexes the biological activity against theStaphylo-coccus aureus, Escherichia coli, Klebssiella pneumoniaebacteria has been investigated. The experimental data sustain stoichiometry of 1:2 (metal/ligand) for the Cu(II), Ni(II), Zn(II) complexes and of 1:1 for the complex with Co(II). The electronic spectra and the magnetic moments suggest octahedral stereochemistry at the complexes with Cu(II), Ni(II) and the tetrahedral geometry for the Co(II) complex. The INHAF ligand is coordinated bidentate by the O=C amide oxygen and the azomethine nitrogen in the complexes of Cu(II), Ni(II), Co(II) and monodentate by the azomethine nitrogen in the complex of Zn(II).

Temperature-dependent magnetic moments of Fe(III) complexes with high-spin–low-spin transitions

1993 ◽  
Vol 47 (9) ◽  
pp. 5455-5458 ◽  
Author(s):  
Kuang Xiao-Yu ◽  
Irène Morgenstern-Badarau ◽  
Isabelle Malfant
Keyword(s):  
High Spin ◽  
Magnetic Moments ◽  
Temperature Dependent ◽  
Spin Transitions

Thermodynamics of metal-ligand bond formation. XXIX. Nickel(II) dialkylmonothiocarbamate complexes

1977 ◽  
Vol 30 (10) ◽  
pp. 2133 ◽  
Author(s):  
DP Graddon ◽  
IA Siddiqi
Keyword(s):  
Absorption Spectra ◽  
High Spin ◽  
Benzene Solution ◽  
Bond Formation ◽  
Molecular Weights ◽  
Metal Ligand ◽  
Ligand Bond

In benzene solution at concentrations below 10-2 M, measurements of molecular weights, absorption spectra and the enthalpies of reaction with bases are all consistent with Ni(SOCNR2)2 (R = Pr or Bu) existing as an equilibrium between low-spin monomeric and high-spin dimeric, probably five-coordinate, species. Enthalpies of dimerization are about -55 kJ (g-atom Ni)-1 and dimerization constants increase from 250 l. mol-1 at about 5�C to 1000 l. mol-1 at 30�C, which shows that the entropy of dimerization is not temperature-invariant. Addition of bidentate bases to the monomer is quantitative with ΔH� about -100 kJ mol-1. Addition of pyridine, 4-methylpyridine or piperidine occurs in two steps, giving high-spin adducts, first five-coordinate NiL2B then six-coordinate NiL2B2 with K1 ≈ K2, ΔH1� ≈ -100 and ΔH2� near zero. Comparisons are made with other low-spin nickel(II) complexes which form high-spin polymers or adducts.

Iron, cobalt, and nickel complexes having anomalous magnetic moments

1968 ◽  
Vol 22 (4) ◽  
pp. 457 ◽  
Author(s):  
E. Kent Barefield ◽  
D. H. Busch ◽  
S. M. Nelson
Keyword(s):  
Magnetic Moments ◽  
Nickel Complexes ◽  
Iron Cobalt ◽  
Cobalt And Nickel
Sign in / Sign up

Export Citation Format

Share Document