29675-09-0Relevant academic research and scientific papers
CROWN THIOETHER CHEMISTRY. THE Co(II) COMPLEXES OF HEXATHIA-18-CROWN-6 AND BIS(TRITHIANONANE)
Hartman, JudithAnn,Hintsa, Eric J.,Cooper, Stephen R.
, p. 1208 - 1214 (1986)
The cobalt(II) complexes of hexathia-18-crown-6 (18S6) and 2,5,8-trithianonane (ttn) have been synthesized and characterized by electron paramagnetic resonance, electrochemical, magnetic, and X-ray diffraction methods. (picrate)2 crystallizes in the triclinic system, space group P1/, with a = 6.659(2) Angstroem, b = 9.565(3) Angstroem and c = 13.591(4) Angstroem, α = 85.15(2)deg, β = 76.05(2)deg, and γ = 76.08(2)deg, and Z = 1. (BF4)2 crystallizes in the orthorhombic system, space group P212121, with a = 10.321(5) Angstroem, b = 12.181(5) Angstroem, c = 21.522(14) Angstroem, and Z = 4.In both complexes the cobalt ion is coordinated solely by thioether groups to give bona fide low-spin six-coordinate Co(II) complexes both in the solid state and solution.Consistent with the low-spin formulation, the complexes exhibit S = 1/2 magnetic moments, and EPR spectra with g ca. 2, g >/= 2, and their CoS6 coordination spheres display marked Jahn-Teller elongation.In addition, cyclic voltammetric measurements show that the complexes exhibit extraordinarly high potentials for the Co(III/II) couple (>/= +840 mV vs.NHE).These results emphasize the ability of thioether ligands to stabilize low-spin and oxidation states by virtue of their ? acidity.
Synthesis of metal-free and metallophthalocyanines containing 18- and 21-membered macrocycles with mixed donor atoms and their metal-ion binding properties
G?k, Halil Zeki
, p. 750 - 763 (2015/08/06)
This paper describes the synthesis of a series of metal-free phthalocyanines and metallophthalocyanines peripherally substituted by macrocycles of different ring sizes with the same donor atom sets. The effects of varying ring size of the macrocycle on the spectroscopic and metal ion binding properties of phthalocyanines were examined. For these purposes, electronic absorption properties for metal-free phthalocyanines and metallophthalocyanines were studied in dimethylformamide and tetrahydrofuran. The liquid-liquid extraction of metal picrates such as Ag(I), Hg(II), Cd(II), Zn(II), Cu(II), Ni(II), Pb(II), and Co(II) from the aqueous phase to the organic phase was carried out using metallophthalocyanines. All new compounds were characterized using several spectroscopic techniques.
Synthesis of (2-hydroxo-5-chlorophenylaminoisonitrosoacetyl)phenyl ligands and their complexes: Spectral, thermal and solvent-extraction studies
Karipcin, Fatma,Dede, Bülent,Cengiz, Mustafa
, p. 530 - 540 (2010/08/04)
Four different types of new ligands Ar[COC(NOH)R] n (Ar=biphenyl, n = 1 H2L1; Ar=biphenyl, n = 2 H 4L2; Ar=diphenylmethane, n = 1 H2L3; Ar=diphenylmethane, n = 2 H4L4; R=2-amino-4-chlorophenol in all ligands) have been obtained from 1 equivalent of chloroketooximes Ar[COC(NOH)Cl] n (HL1-H2L4) and 1 equivalent of 2-amino-4-chlorophenol (for H2L1 and H 2L3) or 2 equivalent of 2-amino-4-chlorophenol (for H 4L2 and H4L4). (Mononuclear or binuclear cobalt(II), nickel(II), copper(II) and zinc(II) complexes were synthesized with these ligands.) These compounds have been characterized by elemental analyses, AAS, infra-red spectra and magnetic susceptibility measurements. The ligands have been further characterized by 1H NMR. The results suggest that the dinuclear complexes of H2L1 and H2L3 have a metal:ligand ratio of 1:2; the mononuclear complexes of H4L2 and H4L4 have a metal:ligand ratio of 1:1 and dinuclear complexes H4L2 and H4L4 have a metal:ligand ratio of 2:1. The binding properties of the ligands towards selected transition metal ions (Mn II, CoII, NiII, CuII, Zn II, PbII, CdII, HgII) have been established by extraction experiments. The ligands show strong binding ability towards mercury(II) ion. In addition, the thermal decomposition of some complexes is studied in nitrogen atmosphere.
Synthesis, magnetic and spectral studies of Co(II) picrate complexes with heterocyclic nitrogen donors
Maurya,Sharma
, p. 509 - 513 (2007/10/03)
New mixed-ligand picrate complexes of cobalt(II), formed by interaction of cobalt(II) picrate with 2-aminobenzothiazole (ABZT), 2-(2'- aminophenyl)benzothiazole (2'-AMPHBZT), 2-(3'-aminophenyl)benzothiazole(3'- AMPHBZT), bipyridyl(Bipy), o-phenonthroline (Phen), and 2,6- bis(benzimidazole-2'yl)pyridine(BBZLY) are described. The complexes have been characterised by elemental analyses, molar conductances, magnetic and decomposition temperature measurements, electron spin resonance, infrared and electronic spectral studies. They have the composition [Co(PA)2(L-L)2], where L - L= ABZT, 2'-AMPHBZT, 3'AMPHBZT, Bipy, Phen or BBZLY. A trans octahedral structure has been tentatively proposed for these complexes.
Synthesis and characterization of some transition metal picrate complexes with isonicotinic acid hydrazide
Bajaj, Rakesh,Jain, C. L.,Gupta, S. K.,Lal, Krishan
, p. 892 - 895 (2007/10/02)
The mixed ligand complexes of Cr(III), Fe(II), Co(II), Ni(II), Cu(II) and Zn(II) picrates with isonicotinic acid hydrazide (INH) of the type (where n = 1, 2 or 3) have been prepared and characterized by elemental analysis, conductance, molecular weight, magnetic susceptibility, electronic, IR and EPR spectra.The investigations indicate that metal ions have octahedral structure but low symmetry distortion exists in some cases.
