Synthesis and Crystal Structure of Bis(1,2‐dimetyl‐5‐nitro‐imidazole)dichlorocobalt(II)
Bis(1,2‐dimethyl‐5‐nitro‐imidazol)dichlorocobalt(II) was obtained by reaction of CoCl2 · 6 H2O with 1,2‐dimethyl‐5‐nitro‐imidazole in methanol. The compound forms blue crystals which were characterized by IR and UV‐vis spectroscopy and by an X‐ray crystal structure determination. Co(C5H7N3O2)2Cl2: tetragonal, space group I42d, Z = 8, a = 1142.1(1) pm, c = 2577.3(2) pm. R = 0.036 for 670 independent reflexions. The Co atom is tetrahedrally surrounded by two chlorine and two N atoms at distances of 222.8(2) and 203.5(4) pm.
The parameters of the crystalline elementary cells were calculated starting from the diffraction X-ray spectra obtained on microcrystalline powders of compounds with thermocbromic and semiconductor properties. The respective cell units belong to the tetragonal system and have the following values: a=6.450 A, c=1.14 A for the Tl2HgI4 compound; a=6.875 A, c=13.110 A for the PbHgI4 compound; a=6.40 A, c=13.12 A for the Au2HgI4 compound. The wet synthesis method is described for the CdHgI4 compounds.
The new N-benzoyl-N-substituted phenyl thiourea ligands have been used to p1·cpare copper(ll) complexes [Cu(L)2Cl2]. The novel complexes were characterized by ESR, IR, NIR, electronic spectroscopy and conductivity measurements, Tentative geometry of the complexes involves four-coordinate environments (tetrahedral distorted D2d) for the copper ion and a monodentate behavior for ligands. In all these complexes N, N-substituted thiourea is sulphur-bonded to the copper ion.
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.
1-(2-Benzthyazolyl)-3-methyl-4-azo-(4-nitrophenyl)-Pyrazolyn-5-one (HL) possesses a chelating behavior. Its chelates with a number of trivalent lanthanide ions Pr(III), Sm(III),Gd(III), Ho(III), La(III) of the type Na3[Ln(L)2(OH)4] have been isolated and characterized on the basis of their elemental analyses, IR and visible spectra, magnetic and molar conductance studies, thermal and X-ray analysis and molecular weight determinations. All chelates have a monomeric octa-coordinated stn1cture and square antiprismatic (C2) symmetry.
In this paper the structural changes of the MXHgI4 -type combinations (M =Ag+, Cu+, Tl+, Pb+2, Cd2+ and x = 1,2) which occur due to pressure (5 -30 MPa) applied on the powder of these complexes are presented. These alterations were confirmed by the X-ray diffraction spectra and by electrital conductibility measurements.
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