Coordination Compounds of Cobalt(II), Nickel(II), and Zinc(II) Valerates and Benzoates with Phenylacethydrazide

Complexes of cobalt(II), nickel(II), and zinc(II) valerates and benzoates with phenylacethydrazide were synthesized. These compounds were characterized by chemical analysis, IR spectroscopy, diffuse reflection spectroscopy, and thermogravimetry.     

Synthesis,Crystal, and Molecular Structure of Bis(thiosemicarbazide)zinc(II) 1,5-Naphthalenedisulfonate Monohydrate [Zn(Tsc)<Subscript>2</Subscript>](1,5-Nds) · H<Subscript>2</Subscript>O

Complex [Zn(Tsc)₂](Nds) · H₂O (I) (Tsc is thiosemicarbazide, NH₂NHC(=S)NH₂, and 1,5-Nds₂–is the double-deprotonated anion of 1,5-naphthalenedisulfonic acid, C₁₀H₆(SO₃) ₂ ^2- ) has been synthesized and studied by IR spectroscopy, thermogravimetry, and X-ray diffraction analysis. The structural units of crystal I are complex cations [Zn(Tsc)₂]²⁺, anions (Nds)^2–, and crystallization water molecules. The Zn atom is coordinated along the vertices of the distorted tetrahedron by two sulfur atoms and two nitrogen atoms of two bidentate chelate (S,N) Tsc ligands. The structural units of crystal I are joined together by a branched network of the N–H···O hydrogen bonds involving independent donor hydrogen atoms of the NH₂ and NH groups of Tsc molecules (nine of ten, except for the H(6A) atom), all six independent acceptor oxygen atoms of the SO₃ groups of the Nds^2– anions, and two acceptor hydrogen atoms and one donor oxygen atom of the water molecule.     

Coordination compounds of cobalt(II), nickel(II), and zinc(II) valerates and benzoates with benzohydrazide

Coordination compounds of cobalt(II), nickel(II), and zinc(II) valerates and benzoates with benzohydrazide have been synthesized and characterized by elemental analyses, IR spectra, diffuse reflectance spectra, and thermogravimetric data.     

Nickel(II) tetraaqua bis(benzoate) tris(phenylacethydrazide) complex [Ni(HL<Superscript>1</Superscript>)<Subscript>3</Subscript>](L<Superscript>2</Superscript>)<Subscript>2</Subscript> · 4H<Subscript>2</Subscript>O: Synthesis and crystal and molecular structure

The synthesis, IR and Raman spectroscopic study, and X-ray diffraction analysis of [Ni(HL¹)₃](L²)₂ · 4H₂O (I), where HL¹ is phenylacetic acid hydrazide and L² is the benzoate monoanion, have been performed. The structural units of a crystal of complex I are complex [Ni(HL¹)₃]²⁺ cations, (L²)^– anions, and crystallization water molecules. The nickel atom is coordinated to the three oxygen atoms at octahedron apices and the three nitrogen atoms of three bidentate chelate (О, N) ligands HL¹ in cis,trans-meredianal (fac) conformation. The structural units of a crystal of complex I are bonded by a branched network of О–Н···О and N–H···O hydrogen bonds.     

Synthesis and crystal structure of <Emphasis Type="Italic">catena</Emphasis>-bis(nicotinamide)aqua(μ-phthalato)copper(II) hemihydrate

The copper(II) phthalate complex with nicotinamide [CuL ₂(μ-Pht)(H₂O)] · 0.5H₂O(I) (where L is nicotinamide and Pht ^2? is an anion of phthalic acid) is synthesized and investigated using IR spectroscopy and X-ray diffraction. The crystals of compound I are monoclinic, a = 13.368(2) Å, b = 7.891(3) Å, c = 20.480(2) Å, β = 108.69(2)°, Z = 4, and space group P2₁/c. The structural units of crystal I are linear chains formed by bridging phthalate anions and crystallization water molecules. The copper atom is coordinated by two pyridine nitrogen atoms of two nicotinamide ligands (Cu-N, 2.001 and 2.045 Å), two oxygen atoms of different phthalate anions (Cu-O, 1.964 and 2.235 Å), and the oxygen atom of the H₂ O molecule (Cu-O, 2.014 Å). The coordination polyhedron of the copper atom is completed to an elongated (4 + 1 + 1) tetragonal bipyramid by the second (chelating) oxygen atom of the carboxyl group (Cu-O, 2.587 Å), which is one of the anions of phthalic acid. The linear polymer molecules are joined into complex macromolecular dimers with the closest internal contacts of the specific type. The macromolecular dimers are the main supramolecular ensembles of the crystal structure.     

Coordination compounds of 3d-metal 5-sulfosalicylates with thiosemicarbazide

Copper(II), nickel(II), and cobalt(III) 5-sulfosalicylate complexes with thiosemicarbazide were synthesized and characterized by elemental analyses, IR spectra, diffuse reflectance spectra, and thermo-gravimetric data.     

Determination of zopiclone in urine by gas chromatography-mass spectrometry

A procedure is described for the quantitative determination of zopiclone and the sum of its metabolites in urine using gas chromatography with the mass-spectrometric detection of their common hydrolysis product, 6-(5-chloro-2-pyridyl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazine-5-on. The procedure is very sensitive. The detection limit for ions with a mass of 45–450 au detected in the full scanning mode is 70 ng/mL. The data of gas chromatography-mass spectrometry are presented for different derivatives of the hydrolysis product of zopiclone; these data can be used for the qualitative identification of zopiclone. The stability of zopiclone and its metabolites upon time was studied by analyzing urine samples from patients receiving therapeutic doses of this substance stored for 1, 3, and 6 months.     

Coordination Compounds of Chromium(III), Manganese(II), and Iron(III) with Diphenyl Thiocarbazide

Complexes of chromium(III), manganese(II), iron(III) with diphenyl thiocarbazide weresynthesized.     

3d-Metal nitroprusside-4-phenylthiosemicarbazide complexes: Synthesis and properties

3d-Metal nitroprusside complexes with 4-phenylthiosemicarbazide of the composition [ML₂][Fe(CN)₅NO] and [CoL₃]₂[Fe(CN)₅NO]₃(M = Ni, Cu, Zn; L = 4-phenylthiosemicarbazide) are synthesized and their structures and physicochemical properties are studied by IR and diffuse reflection spectroscopy and DTA.     

Synthesis of some pyridazino[4,5-b]quinoxaline derivatives

Several derivatives of the little-studied pyridazino[4,5-b]quinoxaline heterocyclic system, the structural isomer of benzopteridine, were synthesized in order to study their biological activity. 6,7-Dimethylquinoxaline-2,3-dicarboxylic acid and a number of its derivatives were also obtained.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 274–278, February, 1972.